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| Illustration 1 | g00881279 |
Generator Set Controls (Low Voltage Switchgear) (1) Alarm module (ALM) (2) Generator set control+ (GSC+) (3) Utility transfer trip switch (UTTS) (4) Lockout relay (86) and status lights for the utility breaker (5) Manual loading potentiometer (MLP) (6) VAR or Power factor adjust potentiometer (VPAP) (7) Touchscreen display (8) Synchronizing switch and synchronizing lights (9) Engine control switch (ECS) (10) Speed adjust potentiometer (SAP) (11) Alarm control switch (ACS) (12) Voltage adjust potentiometer (VAP) (13) Emergency stop push button (ESPB) (14) Circuit breaker switch (CBS) | |
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| Illustration 2 | g00847599 |
Generator Set Controls (Low Voltage) Interior of the Upper Right Compartment (17) "SYNCHRONIZER" (18) DC power converter (19) Watt transducer (20) "ISOCHRONOUS" or "DROOP" switch (IDS) (21) "IDLE" speed or "RATED" speed switch (IRS) (22) Programmable logic controller (PLC) (23) "LOAD SHARING MODULE" (LSM) | |
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| Illustration 3 | g00867059 |
(24) "FLOAT" or "EQUALIZE" switch (FES) for low voltage switchgear | |
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| Illustration 4 | g00867067 |
(25) "FLOAT" or "EQUALIZE" switch (FES) for medium voltage switchgear | |
Note: In illustration 4, the "FUEL TRANSFER" switch will be replaced by a heater for the lubricating oil tank. This heater is standard equipment that is available only on gas engines.
Alarm Control Switch (ACS) (12) - This switch acknowledges the alarm horn. The switch that performs the lamp test is a three-position switch. The ACS is spring loaded in order to return to the center position. The ACS tests all of the discrete alarm indicating lamps.
Circuit Breaker Switch (CBS) (15) - This switch controls the generator circuit breaker. The CBS is a heavy-duty switch. The switch has a spring centering mechanism. The CBS has three positions: momentary trip, center and closed. The CBS has slip contacts for automatic closing. This switch may be locked in the "TRIP" position. The lock is enabled when the switch is pulled and the switch is turned to the tripped position.
Engine Control switch (ECS) (10) - This is a rotary switch which maintains the set position. The ECS has four positions: "OFF RESET", "AUTOMATIC", "MANUAL START" and "COOLDOWN STOP". The "OFF RESET" position is for engine shutdown and resetting faults. The "AUTO" position is used for local automatic operation or remote automatic operation when the operation is initiated by switch operation or contact closure. The "MANUAL START" position is for local starting and manual paralleling. The "COOLDOWN STOP" position is used for initiating cooldown mode during manual operation.
Emergency Stop Push Button (ESPB) (14) - The ESPB will cause the engine to shut down and the generator circuit breaker will be tripped. The ESPB does not allow the engine to start when the ESPB is depressed.
"FLOAT" or "EQUALIZE" Switch (FES) (24), or (25) - This switch adjusts the output of the voltage rectifier of the battery charger. This is done so that the battery can get an equalizing charge. In the "FLOAT" position, the battery charger will maintain a battery voltage that is constant. This voltage is maintained from no load up to 80% of the rated load capacity. In the "EQUALIZE" position, the charger and the rectifier will automatically hold the battery voltage at the equalizing voltage until the switch is placed in the "FLOAT" position. Refer to the operating manual for the battery charger for additional information.
IDLE/RATED SWITCH (IRS) (21) - This switch selects the idle speed or the rated speed. This switch is located inside the switchgear cabinet. This switch selects the engine idle speed or the engine rated speed.
"DROOP-ISOCHRONOUS" Switch (IDS) (20) - The "DROOP-ISOCHRONOUS" switch is located inside the switchgear cabinet. This switch selects one of two modes of operation: isochronous load sharing and speed droop.
Louver Control Switch (LCS) - This switch is optional equipment. This switch is typically located above the power distribution panel. This is a two-position switch. In the "AUTO" position, the louvers will open automatically when a run signal is received from the GSC+. The louvers will close automatically when the run signal is removed. In the "OPEN" position, the louvers will automatically open. If the power module is not in operation, the louvers will remain open until the louver control switch is placed in the "AUTO" position. The louvers will close when the fire suppression system is activated. The louvers will remain closed until the fire alarm is cleared. This is true regardless of the position of the louver control switch.
Manual Loading Potentiometer (MLP) (6) - This control is used in order to adjust the generator load when the generator is manually paralleled with the utility and automatic loading controls are unavailable.
Speed Adjust Potentiometer (SAP) (11) - This potentiometer adjusts the setting for reference voltage of the engine control. Adjustment to the SAP changes the speed (RPM) of the engine and generator.
Synchronizing Switch (SS) (9) - This switch enables the lamps for synchronizing. This switch enables the circuitry for manual breaker closing. The switch does not need to be turned on for automatic operation.
Thermostat (THM1) - This temperature setting is for the space heaters for the switchgear. Space heaters prevent condensation of moisture within the cabinets.
Utility Transfer Trip Switch (UTTS) (4) - This switch resets the latching circuit that is initiated by the trip signal that is provided by the customer. A lamp indicates the latched condition.
Voltage Adjust Potentiometer (VAP) (13) - This adjustment sets the reference voltage of the regulator. Adjustment of the VAP changes the output voltage of the generator.
VAR or Power Factor Adjust Potentiometer (VPAP) (7) - This adjustment allows the fine tuning of the "VAR/POWER FACTOR" of the genset. This is done while the genset is paralleled with the utility. The potentiometer may be turned clockwise in order to produce a leading power factor. The potentiometer may be turned counterclockwise in order to produce a lagging power factor. The controller is disabled when the genset is operating and the genset is isolated from the utility.
LOCKOUT RELAY (5) - This is an ANSI Device 86. This relay causes the generator circuit breaker to trip. This prevents the reclosing of the circuit breaker until the lockout relay is reset. The engine will not start when the lockout relay is tripped. The lockout relay is a device that operates at high speed. The lockout relay is operated by the protective relays and the lockout relay is manually reset.