C27 Generator Set Caterpillar

Parallel Operation

Usage:

C27 N1B

Setup for Multi-unit Paralleling

For island paralleling mode, all units must be interconnected with control wiring for proper load sharing and control functions. All connections are made in the customer connection box.

Review what type of control system is used in each unit that will be paralleled together. Reviewing the control system is the first step in determining how to interconnect units.

If all units have EMCP 4.4 controls, the configuration will be referred to as "Application 1". If one or more units are legacy product, using switchgear or GPC controls, the configuration will be referred to as "Application 2".

"Application 1"

Using 24 Pin Interconnect Harness

Install the factory-supplied 24 pin interconnect harness beginning at connector B (lower) on the first unit to connector A (upper) of the next unit. Continue in this fashion until all Units are connected together. No other interconnect control wiring is required.

The following are the control features that are available when using interconnect harness in "Application 1":

Dead bus arbitration - When starting the group of units, the first unit up to rated voltage and frequency will close to the dead bus. Remaining units synchronize to the live bus.

Load sense/load demand - Automatically regulates which units to be running and paralleled on the common bus based on the load level. Higher load levels will require more units to run, lower load levels will require fewer units to run. To use this feature, each unit must be configured uniquely. Refer to Special Instruction, LEBE0007, "EMCP 4.4 Application and Installation Guide". This feature is disabled as factory default.

Group start - Allows for starting the entire group of units by wiring the remote start contact to a single unit within the group. In order to use this feature, connect a remote run request contact to terminals GRR+ and GRR- on any one unit.

Real power (kW) sharing - Automatically shares the load (kW) proportionally among all paralleled units.

Reactive power (kVAr) sharing - Automatically shares reactive load (VAr) proportionally among all paralleled units. Uses a 0-10V analog signal which is not designed to interface to any devices other than EMCP 4.4.

Lead unit select jumper - Install jumper from terminal 93 to 94 in each unit to allow proper dead bus arbitration.

Note: If one or more units do not have this jumper installed, then none will be allowed to close to the dead bus.

Note: Legacy mode should be OFF in all units.

Interconnect using Customer Terminals

Even in "Application 1" interconnection of all units using the terminals provided in the customer connection box may be necessary. This backup method applies to cases where the interconnect harness is damaged or misplaced and traditional interconnect wiring must be used.

The following are the control features available when using interconnected terminals in "Application 1":

Individual start - Remote run request contact used to start an individual unit within the group. Each unit within the group must have a separate remote start contact. To use this feature, connect a remote start contact to terminals RR and B- on each unit.

Real power (kW) sharing - Automatically shares the load (kW) proportionally among all paralleled units.

Note: When using terminals for interconnect between units, only one unit should connect shield wire on interconnect cable to SHD terminal. Then jumper SHD to B- terminal in that unit. Remaining units should have shield wires of interconnect cables tied together.

Lead unit select interconnect wire - Automatically passes the "close to dead bus" permissive signal from one unit to the next by connecting terminal 95 on the first unit to terminal 94 on the next unit and so on with the remaining units. If the lead unit (having the lead unit select jumper installed) fails to close to the dead bus, the permissive signal is passed to the next unit. Passing the signal allows the next unit to try and close to the dead bus and so on with the remaining units. This interconnect wire is used when automatically starting and paralleling the group of units.

Lead unit select jumper - Install jumper from terminal 93 to 94 in only one unit to select the unit that is permitted to close to a dead bus.

Important: If multiple units have this jumper installed, a danger exists that units can close to the dead bus simultaneously out of phase with each other. Being simultaneously, out of phase could possibly result in equipment damage.

Legacy mode - Toggle the legacy mode switch, inside the upper generator terminal box, ON for each unit. On each unit, verify that the legacy mode indicator lamp is ON. This signals the CDVR to switch to droop mode for VAr sharing automatically, and signals the EMCP 4.4 to disable VAr share lines automatically.

Note: Legacy mode resets only when the battery keyswitch is turned off.

"Application 2"

Using 24 Pin Interconnect Harness and Adapter

Beginning at the first unit, install the factory-supplied interconnect harness from connector B of the first unit to connector A of the next unit. Continue in this fashion until all EMCP 4.4 units are connected together. If the EMCP 4.4 units are grouped at the beginning of the entire group, then at the last EMCP 4.4 unit install the interconnect harness to connector B and add a legacy adapter which allows for wire termination to terminals inside the legacy product.

If the EMCP 4.4 units are grouped at the end of the entire group, then at the first EMCP 4.4 unit install the interconnect harness to connector A and add a legacy adapter which allows for wire termination to terminals inside the legacy product.

If there are multiple legacy units, then continue interconnecting legacy units with customer-supplied wiring.

The following are the control features available in "Application 2":

Individual start - Remote run request contact used to start an individual unit within the group. Each unit within the group must have a separate remote run request contact. To use this feature, connect a remote run request contact to terminals RR and B- on each unit.

Real power (kW) sharing - Automatically shares the load (kW) proportionally among all paralleled units. Uses a 0-3V analog signal which is backwards compatible with legacy products. For EMCP 4.4 units this signal is included in the interconnect harness.

Note: When using terminals for interconnect between legacy units, only have shield wires tied together.

Lead unit select interconnect wire - Automatically passes the "close to dead bus" permissive signal from one unit to the next by connecting terminal 95 on the first unit to terminal 94 on the next and so on with the remaining units. If the lead unit (having the lead unit select jumper installed) fails to close to the dead bus, the permissive signal is passed to the next unit. Passing the signal allows the next unit to try and close to the dead bus and so on with the remaining units. This interconnect wire is used when automatically starting and paralleling the group of units. For EMCP 4.4 units this wire is included in the interconnect harness.

Lead unit select jumper - Install jumper from terminal 93 to 94 in only one unit to select the unit that is permitted to close to a dead bus.

Important: If multiple units have this jumper installed, a danger exists that units can close to the dead bus simultaneously out of phase with each other. Closing simultaneously, out of phase could possibly result in equipment damage.

Legacy mode - Legacy mode is automatically turned ON when using the legacy adapter. A pin-to-pin jumper in the adapter is used to signal all EMCP 4.4 units to switch ON legacy mode.

Note: Legacy mode resets only when the battery keyswitch is turned off.

Note: Some legacy units may have to be put into "reverse compatibility (RC)" mode. Those units will also need to be verified as providing 0-3V load sharing signal to other units for proper load sharing control.

Legacy units in droop - All legacy units must have voltage regulators set to droop mode for proper VAr sharing with other units.

Interconnect using Customer Terminals

In "Application 2", interconnection of all units using the terminals provided in the customer connection box may be necessary. This backup method for applies to cases where the interconnect harness is damaged or misplaced and traditional interconnect wiring must be used.

The following are the control features available in "Application 2":

Real power (kW) sharing - Automatically shares the load (kW) proportionally among all paralleled units. Uses a 0-3V analog signal which is backwards compatible with legacy products.

Lead unit select jumper - Install jumper from terminal 93 to 94 in only one unit to select the unit that is permitted to close to a dead bus.

Legacy mode - Toggle the legacy mode switch, inside the upper generator terminal box, ON for each EMCP 4.4 unit. On each unit, verify that the legacy mode indicator lamp is ON. This signals the CDVR to switch to droop mode for VAr sharing automatically, and signals the EMCP 4.4 to disable VAr share lines automatically.

Note: Legacy mode resets only when the battery keyswitch is turned off.

Legacy units in droop - All legacy units must have voltage regulators set to droop mode for proper VAr sharing with other units.

Manual Operation

The power module can be used in parallel with other units to provide power for an isolated load. Manual operation refers to manually closing the generator breaker using the circuit breaker switch. The following information describes the steps for manual operation.

Ensure that all load cable connections have been correctly made.

Verify that the unit can be safely started.

Verify that power can be applied to the load.

Ensure setup procedures for "Application 1" or "Application 2" have been performed.

Start Up Procedure for the First Unit

The following procedure applies to the first or primary unit that will be closing to a dead bus.

Note: If the system is set up in legacy mode, then the first unit must be the one with the lead unit jumper installed. If the system is not set up in legacy mode, then any unit can be chosen as the first unit.

Press the "RUN" button that is on the EMCP 4.4.
Note: The engine will begin to start immediately.

Use the EMCP 4.4 display to observe the generator voltage and the frequency once the engine is running at the rated speed.
Note: The sync mode setting in the EMCP 4.4 will automatically change to "check" mode when the EMCP 4.4 powers up. Additionally, the sync mode setting will automatically change to "check" mode whenever the EMCP 4.4 "STOP" button is pressed. "Check"mode causes automatic generator-to-bus synchronization (not applicable in "single unit mode") but requires manual closing of the generator breaker using the circuit breaker switch.
Note: If manual voltage and/or frequency adjustments are necessary, the EMCP 4.4 sync mode should be set to "manual". However, when paralleled in "legacy mode" application, manual voltage adjustment is allowed only after the breaker is closed.

If the EMCP 4.4 sync mode switch has been changed to "manual mode", make necessary voltage and/or frequency adjustments using the EMCP 4.4 control screen interface. Otherwise go to step 4

Use the circuit breaker switch to close the generator breaker at the desired time. Rotate the handle clockwise until the breaker closes, then release the handle. After the handle is released, the generator unit will be providing power for 100 percent of the load.

Start Up Procedure for All Other Units

The following procedures apply to the other units that are paralleling to a live bus.

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Illustration 1	g02314673
Sync mode switch

Sync mode switch (SMS) determines generator breaker control (manual or automatic close) and generator-to-bus synchronization control. Use function keys F1-F4 to change selection if desired.

Note: Always verify sync mode before startup. To verify sync mode, press CONTROL button on the EMCP 4.4 then select "PARALLELING" then select "SYNC MODE SWITCH".

Note: The sync mode setting in the EMCP 4.4 will automatically change to "check" whenever the EMCP 4.4 is put in "STOP" mode (either upon boot-up or when pressing the "STOP" button on the EMCP 4.4). "Check" mode causes automatic generator-to-bus synchronization but requires the operator to close the generator breaker manually using the circuit breaker switch.

The Sync Overview screen shows the status of the generator and bus with the generator on the left-hand side of the screen.

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Illustration 2	g02314354
Sync overview screen

The arrows on the graphs of voltage, frequency, or phase show the value of that generator parameter relative to the corresponding bus value. The black bar on the graph represents the sync window for that parameter. When the arrow lines up to the black portion of the graph, then this parameter is close to the value of the same bus parameter. The width of the black bar is representative of the size of the programmed window for that parameter.

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Illustration 3	g02140727
Voltage/frequency control screen

Determine sync mode. Sync mode should be in "CHECK".

Press the "RUN" button that is on the EMCP 4.4.
The engine will begin to start immediately.

Use the EMCP 4.4 display to observe the generator voltage and the frequency once the engine is running at the rated speed.

Observe the synchroscope on the EMCP 4.4 (Illustration 2).

If the EMCP 4.4 sync mode switch has been changed to "manual" mode, then make necessary voltage and/or frequency adjustments using the EMCP 4.4voltage/frequency control screen interface (illustration 3), otherwise go to step 6.
Note: Voltage or frequency adjustments can only be made prior to closing the breaker (unless paralleled in "legacy mode") and only when the sync switch is in "manual" mode. In "legacy mode", manual voltage adjustment is allowed only after breaker is closed.

Use the circuit breaker switch to close the generator breaker at the desired time and when the sync overview screen indicates that the generator is in-sync with the bus (all arrows within the black bars). Rotate the handle clockwise until the breaker closes, then release the handle.

The paralleled units are now powering the load, sharing load proportionally.

Shut Down Procedure for Each Unit

Verify load level permits unit shutdown without overburdening the remaining paralleled units.

Press "STOP" button that is on the EMCP 4.4.
Note: Pressing "STOP" begins ramping down generator output. At the programmed kW trip level, the breaker will automatically trip open and engine will go into cooldown.

Automatic Operation

The power module can be used in parallel with other units to provide power for an isolated load. Automatic operation refers to the use of the on-board control system to close the generator breaker automatically. The following information describes the steps for automatic operation.

Ensure that all load cable connections have been correctly made.

Verify that the unit can be safely started.

Verify that power can be applied to the load.

Ensure setup procedures for "Application 1" or "Application 2" have been performed.

Pre-startup Procedures

Install the lead unit jumper as necessary. Refer to section regarding "Application 1" and "Application 2" to determine appropriate use of this jumper.

Install wiring from the remote run request contact.
Note: The remote run request contact is controlled by the automatic transfer switch or by other customer supplied controls.

Press the EMCP 4.4 "AUTO" key in each unit so that all units are in "AUTO" mode.
Note: The sync mode setting in the EMCP 4.4 will automatically change to "AUTO" whenever the EMCP 4.4 is put in "AUTO" mode
Note: For automatic breaker close control, the generator breaker control switch must be in the normal position (not in trip) and either red or green flagged.

Startup Procedure

All units can be started simultaneously using a remote run request contact.

After the lead unit is running at rated speed, then the generator breaker will close automatically to a dead bus.

All of the other units will automatically synchronize and then close to the live bus.
Note: Alternatively, each unit can be started individually, beginning with the lead unit, first placing the EMCP 4.4 sync mode switch in "auto" mode. After placing the EMCP 4.4 sync mode switch in "auto" mode, press the "RUN" button on the EMCP 4.4. The generator breaker will close automatically once the unit is up to rated voltage and frequency and synchronized with the bus.

The paralleled units now power the load and share the load proportionally.

Shutdown Procedure

Any of the methods below will initiate a normal shutdown:

If a remote run request contact is used to start the units, then open the contact in order to put all units in stop/cooldown.

Press the "STOP" button that is on the EMCP 4.4 in each unit to put all units in stop/cooldown.

Note: First, verify load level permits unit shutdown without over-burdening the remaining paralleled units.

Note: Pressing "STOP" begins ramping down generator output. At the programmed kW trip level, the breaker will automatically trip open and engine will go into cooldown.

Utility Paralleling Mode

Manual Operation

The power module can be used as a stand-alone unit to parallel to the utility for base load operation. Manual operation refers the use of the circuit breaker switch to close the generator breaker manually. The following information describes the steps for manual operation.

Ensure that all load cable connections have been correctly made.

Verify that the unit can be safely started.

Install wiring from the aux (a) contact of the utility intertie breaker to terminals "UTB+" and "UTB-". When the intertie breaker is closed, this gives a signal to the unit to indicate utility paralleling mode.

Optionally, install wiring from the utility system for "transfer trip." Installing this wiring will allow the utility system to issue a trip signal (dry contact) to the 86 lockout relay on the unit. This results in the generator breaker tripping open and engine placed in stop/cooldown mode.

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NOTICE

Verify the correct load phase rotation with the generator prior to connecting the output power cables. Failure to match the generator phase rotation with the bus connection prior to paralleling may result in damage to equipment.

Pre-startup Procedures

Verify that the "lead unit jumper" (between terminals 93 and 94 in the customer connection box) is not installed. The unit should never be allowed to close to a dead utility system.

Program the EMCP 4.4 with the desired base load level (kW) and power factor level (PF) output of the generator. These values can be adjusted at any time.

Start Up Procedure

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Illustration 4	g02314673
EMCP 4.4 Sync Mode Switch

Sync mode switch (SMS) determines generator breaker control (manual or automatic close) and generator-to-bus synchronization control.

Use function keys F1-F4 to change selection if desired.

IMPORTANT: Always verify sync mode before startup. To verify, press the "CONTROL" button on the EMCP 4.4 then select "PARALLELING" then select "SYNC MODE SWITCH".

The Sync Overview screen shows the status of the generator and bus with the generator on the left-hand side of the screen.

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Illustration 5	g02314354
EMCP 4.4 Sync Overview Screen

When the arrow lines up to the black portion of the graph, then this parameter is close to the value of the same bus parameter. The width of the black bar is representative of the size of the programmed window for that parameter.

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Illustration 6	g02140727
EMCP 4.4 Voltage/Frequency Control Screen

Determine sync mode – sync mode should be in "CHECK"

Press the "RUN" button that is on the EMCP 4.4.

Note: The engine will begin to start immediately.

Use the EMCP 4.4 display to observe the generator voltage and the frequency once the engine is running at the rated speed.

Observe the synchroscope on the EMCP 4.4 sync overview screen.

Make necessary voltage and/or frequency adjustments using the EMCP 4.4 voltage/frequency control screen interface, otherwise go to step 6.
Note: Manual voltage and/or frequency adjustments are unrestricted in this method of operation.

Use the circuit breaker switch to close the generator breaker at the desired time and when the sync overview screen indicates that the generator is in-sync with the bus (all arrows within the black bars). Rotate the handle clockwise until the breaker closes, then release the handle.
Note: If the optional UMR box is installed, then the UMR is required to perform sync check to allow the breaker to close.

The unit is now paralleled to the utility source, base loading power to the utility system.

Shut Down Procedure for Each Unit

Press "STOP" button that is on the EMCP 4.4.

Note: Pressing "STOP" begins ramping down generator output. At the programmed kW trip level, the breaker will automatically trip open and engine will go into cooldown.

Automatic Operation

The power module can be used as a stand-alone unit to parallel to the utility for base load operation. Automatic operation refers to the use of the on-board control system to close the generator breaker automatically.

The following information describes the steps for automatic operation.

Ensure that all load cable connections have been correctly made.

Verify that the unit can be safely started.

Install wiring from aux (a) contact on the utility intertie breaker to terminals "UTB+" and "UTB-". When The intertie breaker is closed, this gives a signal to the unit to indicate utility paralleling mode.

Optionally, install wiring from the utility system for "transfer trip." Installing this wiring will allow the utility system to issue a trip signal (dry contact) to the 86 lockout relay on the unit. This results in the generator breaker tripping open and engine placed in stop/cooldown mode.

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NOTICE

Verify the correct load phase rotation with the generator prior to connecting the output power cables. Failure to match the generator phase rotation with the bus connection prior to paralleling may result in damage to equipment.

Pre-startup Procedures

Verify that the "lead unit jumper" (between terminals 93 and 94 in the customer connection box) is not installed. The unit should never be allowed to close to a dead utility system.

Program the EMCP 4.4 with the desired base load level (kW) and power factor level (PF) output of the generator. These values can be adjusted at any time.

Install wiring from the remote run request contact.
Note: The remote run request contact is controlled by customer-supplied controls.

Press the EMCP 4.4 "AUTO" key.

Note: The sync mode setting in the EMCP 4.4 will automatically change to "auto" whenever the EMCP 4.4 is put in "AUTO" mode

Note: For automatic breaker close control, the generator breaker control switch must be in the "normal" position (not in trip) and either red or green flagged.

Startup Procedure

The engine will start when the remote run request contact is closed.

After the unit is up to rated speed, the generator will automatically synchronize and parallel to the utility.
Note: If the optional UMR box is installed, then the UMR is required to perform sync check to allow the breaker to close.
Note: Alternatively, the unit can be started by first placing the EMCP 4.4 sync mode switch in "auto" mode. After placing the EMCP 4.4 sync mode switch in "auto" mode, press the "RUN" button on the EMCP 4.4. The unit will automatically parallel to the utility once the unit is up to rated voltage and frequency.

The unit is now operating in parallel with the utility. The unit will automatically ramp to the selected base load level. Observe operation of the unit. Ensure that the unit is "soft loaded" to the desired base load level. Ensure the power factor (PF) level and base load level remains consistent. Adjustment of the base load level is allowed at any time. Adjustments can only be made using the EMCP 4.4 screen interface.

Shutdown Procedure

Any of the methods below will initiate a normal shutdown.

a. If a remote run request contact is used to start the unit, then open the contact in order to put the unit in stop/cooldown.

b. Press the "STOP" button that is on the EMCP 4.4 in order to put the unit in stop/cooldown.

Note: Pressing "STOP" begins ramping down generator output. At the programmed kW trip level, the breaker will automatically trip open and engine will go into cooldown.

Shore Power Distribution Connections

Three separate customer connection blocks are provided to accept customer-supplied power sources.

This allows for three separate voltage sources to be used and provides for balanced load distribution.

Connection block (left side)

The purpose of this connection is to provide power to the following on-board equipment:

PRIMARY jacket water Heater (includes circulation pump)
Fuel tank fuel transfer pump

Note: To reduce current draw from the source, the jacket water heater will be disabled during use of the fuel transfer pump.

Note: If the generator is set to run at 60Hz operation, the fuel transfer pump power source will automatically be selected as shore power (if engine is not running) or generator power (if engine is running). If the generator is set to run at 50Hz operation, the shore power source is disabled.

Acceptable shore power source (nominal): 120VAC, 60Hz, 30A circuit with ground Or 110-115VAC, 50Hz, 30A circuit with ground

Connection block (middle)

The purpose of this connection is to provide power to the on-board SECONDARY jacket water Heater.

Note: Do not power the SECONDARY jacket water heater without also powering the PRIMARY jacket water heater since the circulation pump is required for proper operation.

Acceptable shore power source (nominal): 120VAC, 60Hz, 30A circuit with ground Or 110-115VAC, 50Hz, 30A circuit with ground

Connection block (right side)

Purpose of this connection is to provide power to the following on-board equipment:

Generator anti-condensation Heater
Battery charger
Convenience duplex receptacle

Note: If the generator is set to run at 60Hz operation, the duplex receptacle power source will automatically be selected as shore power (if engine is not running) or generator power (if engine is running). If the generator is set to run at 50Hz operation, the generator power source is disabled.

Acceptable shore power source (nominal): 120VAC, 60Hz, 30A circuit with ground Or 110-115VAC, 50Hz, 30A circuit with ground

Customer Connections

The following is a description of each control or monitoring signal that is provided for the customer at the terminal strip in the customer connection box.

B(+) and B(-) - Battery positive and negative from the generator starting batteries.

Note: Diodes to prevent backfeed from other units and circuit breaker protection provided inside the generator upper terminal box.

Utility Breaker Status - The utility breaker status input provides the generator control with the open or closed status of the utility circuit breaker. The status informs the control if the system is in parallel with the utility. The input is connected to utility circuit breaker auxiliary normally open contact. The configuration is designed to close the auxiliary contact when the utility breaker is closed.

Utility Transfer Trip - The utility transfer trip provides the system with an input for a breaker trip that is commanded by the utility. The utility transfer trip opens the generator circuit breaker and places the engine in stoop/cool down. The utility transfer trip activates the onboard, manual reset type, "86 Lockout Relay".

Note: Requires the UMR box to be installed in the unit.

Remote Start Signal - The remote start signal is connected to the "RR" and "B-" terminals. The remote start signal provides the signal to start only the power module it is wired to remotely. The remote start signal can originate from a SCADA or automatic transfer switch.

Group Start Signal - The group start signal is connected to the "GRR+" and "GRR-" terminals. The remote start signal provides the signal to start the entire group of units that will parallel together remotely, in island paralleling mode. The remote start signal can originate from a SCADA or automatic transfer switch.

Note: This feature requires the standard interconnect harness to be installed between units from connector B to connector A in order to pass the signal to other units.

Standard Alarm - The standard alarm provides dry contacts that change state when any alarm or shutdown of a metered parameter is active. The temperature, pressure, and level are examples of metered parameters.

Engine Running - The engine running relay provides dry contacts that change state when the engine is running.

Not in Auto - The "Not in Auto" relay provides dry contacts that change state when the EMCP is not in auto mode.

Fuel Alarm - The fuel alarm provides dry contacts that change state when the fuel level is above the fuel level high warning set point or below the fuel level low warning set point.

Generator Breaker Status - Provides dry contacts that change state when the generator breaker is closed.

Load Share Lines - Provides a means of connection with other units to share the load (kW) automatically, and proportionally among all paralleled units. Uses a 0-3V analog signal (which is backwards compatible with legacy products).

Note: These terminals are not used if units are interconnected using the standard interconnect harness installed between units from connector B to connector A.

First up Logic - Provides a means of connection with other units to pass the "close to dead bus" permissive signal automatically, from one unit to the next. The signal is passed by connecting terminal 95 on the first unit to terminal 94 on the next unit and so on with the remaining units. If the "lead" unit (having the lead unit select jumper installed) fails to close to the dead bus, the permissive signal is passed to the next unit. Passing the signal allows it to try and close to the dead bus and so on with the remaining units. This interconnect wire is used when automatically starting and paralleling the group of units.

Note: These terminals are not used if units are interconnected using the standard interconnect harness installed between units from connector B to connector A.

Generator Circuit Breaker

The generator circuit breaker is a 100% rated universal power circuit breaker. The generator circuit breaker is designed to protect electrical systems from damage caused by overloads, short circuits, and equipment ground faults. The circuit breaker is designed to open and close a circuit electrically. The circuit breaker is designed to open the circuit automatically at a predetermined over current setting.

The generator circuit breaker is operated via a stored energy mechanism. The stored energy mechanism can be charged manually or charged by using a motor. The closing time is less than five cycles. Closing and opening operations can be initiated by electrical signals.

Closing the Breaker

The generator circuit breaker can be closed automatically when running in the "AUTO" mode or manually with the circuit breaker switch in the "RUN" mode. All of the following conditions must exist to close automatically or manually:

Engine running
Voltage/frequency normal
Circuit breaker switch is in the normal position (red or green flagged) for automatic operation OR is in the close position for manual operation
UMR sync check is active (if UMR is installed and the utility circuit breaker is closed)
86 lockout device not tripped (if UMR is installed)
Primary unit jumper installed (when dead bus closing only)
No shutdown alarm is active
Customer connection box door is closed

Opening the Breaker

The generator circuit breaker can be opened manually by rotating the handle of the circuit breaker switch to the left. The breaker can be held open indefinitely by rotating the handle of the circuit breaker switch to the left, then pull the switch handle toward the operator. The circuit breaker will open automatically in the event of any of the following reasons: