XQ Auto Paralleling Caterpillar

Manual Operation

The power module can be used in parallel with other units to provide power for an isolated load. 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.

1. Ensure that all load cable connections have been correctly made.

2. Verify that the unit can be safely started.

3. Verify that power can be applied to the load.

The following procedures have instructions that are categorized as "Application 1" or "Application 2". Use the appropriate instructions for the application of the unit.

Application 1 - The units that will be paralleled together to power the isolated load must all have the same auto paralleling controls. The auto paralleling controls must use the GPC-based controls.

Application 2 - The units that will be paralleled together to power the isolated load, do not have the same auto paralleling controls. One or more units will be load sharing using a Woodward load share module (LSM). And one or more units will be load sharing using a "Generator Paralleling Controller" (GPC).

Pre-starting Procedures

The pre-startup procedures are to be performed by qualified personnel. Perform the following steps before the units are started.

1. Ensure that the GPC and the UMR paralleling controls are turned on.

2. Select the unit that will be closed to the dead bus first. The unit that is selected must be the only unit to have a lead unit jumper installed. The lead jumper must be installed on terminals 1UP-93 and 1UP-94 in the customer connection box.

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Illustration 1	g02162167
Customer Connections

3. Install the required interconnect wiring between all of the units for real power (kW) load sharing. Terminals LS+ and LS- must be used for load sharing.

Application One - Generator Paralleling Control (GPC) Equipped Units

Illustration 2	g02246344

"Volts Amperes Reactive" (VAR) sharing is optional if connecting GPC units for island mode load sharing. Perform the following steps to use VAR sharing.

1. Connect a shielded cable with a twisted pair of wires to terminals VS+ and VS- between all of the units. The interconnect wiring provides load sharing for reactive power (kVAR).

2. If the Cat DVR settings are unknown, then use the Caterpillar service tool to verify the configuration of the Cat DVR. The "load compensation mode" parameter must be set to OFF.

   Note: The Cat DVR configuration must be confirmed for each unit that will be paralleled on the isolated bus.

3. Enable, set to "ON", the VAR load share set point in each GPC equipped power module.

   Note: The VAR load share set point must be set for each unit that will be paralleled on the isolated bus.

Application Two - GPC Equipped Units Paralleled with Legacy Equipped Units

Illustration 3	g02246345

VAR sharing is not available if connecting the GPC to legacy units, with load share modules, for island mode load sharing.

1. Connect LS+ and LS- among all units and use voltage droop for VAR regulation.

   Note: Do NOT connect VS+ and VS- on any of the units.

2. Use the Caterpillar service tool to change the Cat DVR configuration of the "load compensation mode" parameter. The "load compensation mode" parameter must be changed from the default value to "DROOP".

   Note: Each power module that is equipped with touch screen-based switchgear, must have the LSM enabled. The LSM is enabled by installing the "Reverse Compatibility Mode" jumper. The jumper location is determined by the part number.

3. If the LSM settings are unknown, then perform the tuning procedure on each unit that is equipped with an LSM. The load share signal output to other units must be 0 V to 3 V. Zero V is representative of no load. 3 V represents full load. For example, the XQ2000 generator units are rated at 0 V to 3 V with the power rated at 0 to 2000 kW.

4. Verify that the VAR sharing set point is disabled, set to "OFF", in each GPC module.

   Note: The VAR sharing set point parameter must be set for each unit that will be paralleled on the isolated bus.

Shield wires must be connected to terminal blocks on the primary unit only. On middle units, connect the shield wires together. Do not connect the shield wires to terminal blocks or to each other on the end unit.

Only ONE primary unit should jumper from 1UP-93 to 1UP-94 can be used in the interconnect panel. The primary unit jumper allows the breaker to close to a dead bus.

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.

1. Press the "RUN" button that is on the EMCP 3.

   Note: The engine will begin to start immediately.

2. Use the EMCP 3 display to observe the generator voltage and the frequency once the engine is running at the rated speed.

3. Use the operator controls to adjust the voltage as necessary.

   Note: The frequency is automatically controlled by the GPC.

4. Use the circuit breaker switch to close the generator breaker at the appropriate time. Rotate the handle clockwise until the breaker closes, then release the handle.

Start Up Procedure for All Other Units

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

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

1. Press the "RUN" button that is on the EMCP 3.

   Note: The engine will begin to start immediately.

2. Use the EMCP 3 display to observe the generator voltage and the frequency once the engine is running at the rated speed.

3. Use the operator controls to adjust the voltage as necessary.

   Note: The frequency is automatically controlled by the GPC.

4. Observe the linear LED synchroscope that is on the GPC. The generator is in sync with the bus if the green LED, that is in the center position, is lit. The breaker can be closed if the generator is in sync with the bus.

   Note: The linear LED synchroscope is for visual indication only in this mode of operation. The sync check is performed by the 25 relay.

5. Use the circuit breaker switch to close the generator breaker at the appropriate time. Rotate the handle clockwise until the breaker closes, then release the handle.

Shut Down Procedure for Each Unit

1. Press "STOP" button that is on the EMCP 3.

Note: The generator breaker will open immediately. The engine will continue to run in cool down mode until the cool down time has elapsed. The engine will shut down after the cool down time has elapsed.

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.

1. Ensure that all load cable connections have been correctly made.

2. Verify that the unit can be safely started.

3. Verify that power can be applied to the load.

The following procedures have instructions that are categorized as "Application 1" or "Application 2". Use the appropriate instructions for the application of the unit.

Application 1 - The units that will be paralleled together to power the isolated load must all have the same auto paralleling controls. The auto paralleling controls must use the GPC-based controls.

Application 2 - The units that will be paralleled together to power the isolated load, do not have the same auto paralleling controls. One or more units will be load sharing using a Woodward load share module (LSM). And one or more units will be load sharing using a "Generator Paralleling Controller" (GPC).

Pre-startup Procedures

The pre-startup procedures are to be performed by qualified personnel. Perform the following steps before the units are started.

1. Ensure that the GPC and the UMR paralleling controls are turned on.

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Illustration 4	g02162167
Customer Connections

2. Select the unit that will be closed to the dead bus first. The unit that is selected must be the only unit to have a lead unit jumper installed. The lead unit jumper must be installed on terminals 1UP-93 and 1UP-94 in the customer connection box.

   Note: If the lead unit fails to start, one of the other generator units must be permitted to close automatically to the dead bus. Interconnect wiring must be installed between all of the units to allow one of the other generator units to close automatically to the dead bus. Refer to the information film that is located near the interconnect terminals for interconnect wiring details.

3. Install the required interconnect wiring between all of the units for real power (kW) load sharing. Terminals LS+ and LS- must be used for load sharing.

Application One

1. Install the interconnect wiring on terminals VS+ and VS- between all of the units. The interconnect wiring provides load sharing for reactive power (kVAR).

2. If the Cat DVR settings are unknown, then use the Caterpillar service tool to verify the configuration of the Cat DVR. The "load compensation mode" parameter must be set to OFF.

   Note: The load compensation mode parameter configuration must be set for each unit that will be paralleled on the isolated bus.

3. The "reactive power load share" parameter for each GPC must be set to "ON".

Note: The "reactive power load share" parameter configuration must be set for each unit that will be paralleled on the isolated bus.

Application Two

1. Use the Caterpillar service tool to change the Cat DVR configuration of the "load compensation mode" parameter. The "load compensation mode" parameter must be changed from the default value to "DROOP".

   Note: Each power module that is equipped with touch screen-based switchgear, must have the LSM enabled. The LSM is enabled by installing the "Reverse Compatibility Mode" jumper. The jumper location is determined by the part number.

   Note: The "load compensation mode" parameter configuration must be set for each unit that will be paralleled on the isolated bus.

2. If the LSM settings are unknown, then perform the tuning procedure on each unit that is equipped with an LSM. The load share signal output to other units must be 0 V to 3 V. Zero V is representative of no load. 3 V represents a full load. For example, the XQ2000 generator units are rated at 0 V to 3 V with the power rated at 0 to 2000 kW.

3. The "reactive power load share" parameter for the GPC must be set to "OFF".

   Note: The "reactive power load share" parameter configuration must be set for each unit that will be paralleled on the isolated bus.

4. Press the "AUTO" key that is on each EMCP 3 generator control.

Startup Procedure

1. The engine will begin starting by either of two methods.

   1. The engine can start if the remote run request contact is closed that is wired to each unit.

   2. The engine can start if each local start/stop switch is placed in the ON position, one unit at a time, beginning with the lead unit.

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

   Note: If the lead unit takes too long (default is 45 seconds) to close the breaker, the "fail-to-parallel" timer (FPT) will cause a shutdown. The permissive signal will be transferred to the next unit to allow that unit to close to the dead bus.

3. All of the other units will automatically synchronize and then close to the live bus.

The paralleled units can now share the load proportionally.

Shutdown Procedure

1. Any of the methods below will initiate a normal shutdown.

   1. If a remote run request contact is used to start the generator set, then open the remote run request contact.

   2. If a local start switch is used, then switch the local start/stop switch to the OFF position at each unit.

   3. If either a local or a remote start is used, then press the "STOP" button that is on the EMCP 3 control at each unit.

      Note: The generator breaker will open immediately. The engine will continue to run in cool down mode until the cool down time has elapsed. Once the cool down delay has elapsed, then the engine will shut down.