XQ Auto Paralleling Caterpillar

Generator Paralleling Control (GPC)

The GPC can parallel in island mode or with a utility.

Illustration 1	g02148336
Generator Paralleling Control (GPC) (1) Auto lamp (2) Active lamp (3) Circuit breaker close command lamp (4) Hz plus and Hz minus lamps (5) LED synchroscope lamps (6) Generator circuit breaker closed lamp (7) V+ and V- lamps (8) Display and select pushbutton (9) Digit button (10) Clear and cursor pushbutton

1. AUTO Lamp (1) - The auto LED is lit when any of the following conditions are present.

   1. The auto LED will light if the controller is performing auto synchronization. The breaker must be open. The EMCP 3 must be in "AUTO" mode. The voltage and frequency must be at operating levels.

   2. The auto LED will light if the generator breaker is closed in either "SINGLE UNIT" mode or "ISLAND" mode.

   3. The LED will light if the generator breaker is closed with a request to run active in "UTILITY PARALLEL" mode.

      Note: The auto lamp will go off as the engine speed ramps down.

2. ACTIVE Lamp (2) - The active LED is lit when not in set point programming mode.

   Note: The active lamp does not indicate whether set point programming is in use by the PC interface.

3. CB CLOSE CMD Lamp (3) - A circuit breaker close signal from the controller will cause the "CB CLOSE CMD" LED to illuminate.

   Note: A circuit breaker close signal from the controller will occur only when the green "SYNCHROSCOPE" LED is lit. The green "SYNCHROSCOPE" LED is located in the center of the row of LED synchroscope lamps (5) .

4. Hz- and Hz+ Lamps (4) - The Hz- and Hz+ lamps indicates that the controller is actively biasing the speed signal to the engine control. The Hz- lamp means that the controller is actively biasing the engine to decrease speed. The Hz+ lamp means that the controller is actively biasing the engine to increase speed. If the generator set is paralleled with other sources, the Hz- and Hz+ lamps indicates decreasing or increasing generator real load (kW) contribution.

5. LED SYNCHROSCOPE Lamps (5) - If the lights are illuminated from left to right, then the generator is moving faster than the bus. If the lights are illuminated from right to left, then the generator is moving slower than the bus. The synchroscope is only active if the voltage is within 50 percent to 125 percent of the rated voltage. The synchroscope is only active if the frequency is within +/- 2 Hz. If the green LED is lit, that is located in the center position of the row (5), then the generator is synchronized with the bus.

6. GEN CB CLOSED Lamp (6) - The "GEN CB CLOSED" lamp is lit if the generator breaker is closed.

7. V- and V+ Lamps (7) - The "V- and V+" lamps indicate the controller is actively biasing the voltage regulator. V- means that the controller is actively biasing the voltage regulator to decrease voltage. V+ means that the controller is actively biasing the voltage regulator to increase voltage. If the generator set is paralleled with other sources, the "V- and V+" lamps indicate decreasing or increasing generator reactive (VAR) contribution.

8. DISPLAY and SELECT Pushbutton (8) - When the active lamp is lit, press this button will cause the display to alternate between 2 AC metering screens. One of the screens will display generator voltage and frequency. The same screen will display bus voltage and frequency. The other screen shows generator voltage, current, kW and power factor (PF). The "i" indicates a lagging and inductive load. The "c" indicates a leading and a capacitive load. When the "ACTIVE" lamp is off, press the display and select button to apply the set point changes that were made. The "SELECT" function will advance through the set points menu.

9. DIGIT Pushbutton (9) - The "DIGIT" pushbutton is used only when programming the set points. One example of a set point is the lamp off "ACTIVE". The number that is highlighted by the cursor will increase by one digit if the "DIGIT" pushbutton is pressed.

10. CLEAR/CURSOR Pushbutton (10) - When the "ACTIVE" lamp is lit, press the "CLEAR/CURSOR" pushbutton to clear controller alarms. If the "ACTIVE" lamp is off, press the "CLEAR/CURSOR" pushbutton to move the cursor to the desired set point digit.

    Note: Press the "DIGIT" and the "CLEAR/ CURSOR" pushbuttons simultaneously to enter/exit the set point programming mode. Press the "DISPLAY/SELECT" and the "CLEAR/ CURSOR" pushbuttons simultaneously to move back in the set points menu.

Paralleling Controls Disconnect Switch

The paralleling controls disconnect switch will remove power from the GPC and UMR and allow the system to operate in single unit standalone mode.

The paralleling controls disconnect switch (32) is located behind the upper access panel of the terminal box. Refer to Illustration 2.

Illustration 2	g02332513

Frequency adjustments can be made with the paralleling controls turned off. The frequency adjustment is made with the speed adjustment potentiometer that is located on the front of the control panel. When the paralleling controls are turned on, speed adjustment is governed by the GPC. When the paralleling controls are turned on, speed adjustment by the operator is not allowed.

Illustration 3	g02209515

Breaker and Load Management

Illustration 4	g02149180
(15) Utility transfer trip lamp (UTTL) (16) Utility closed breaker lamp (UCBL) (17) 86 Lockout switch (86) (18) Circuit breaker switch (CBS) (19) Auto start lamp (ASL) (20) Primary unit lamp (PUL) (21) Base load potentiometer (BLP) adjust (22) Base load switch (BLS) (23) Local start switch (LSS)

1. Utility Breaker Lamp (15) - The utility breaker lamp will illuminate when the utility breaker is closed. The generator is operating in parallel with the utility source if the following conditions are true.

   1. The utility breaker lamp is illuminated.

   2. The red LED on the breaker control switch (18) is illuminated.

2. Utility Transfer Trip Lamp (16) - This LED is lit when the utility transfer trip signal is present.

3. 86 Lockout Relay (17) - The "86 Lockout Relay" device performs fast response fault clearance. The fault is cleared by opening the generator breaker and by placing the engine in cooldown if a fault occurs. The fault must be detected by the on-package utility multi-function relay (UMR) or the utility transfer trip signal.

   Note: The EMCP 3 must be in "STOP" mode to allow the manual reset of the 86 lockout relay. Resetting the 86 lockout relay will reset fault alarms in the UMR.

4. Circuit Breaker Switch (18) - The automatic paralleling modes require that the circuit breaker switch must be in the center position. Either the red flag or the green flag must be displayed. Manual paralleling modes require the following conditions.

   1. The generator breaker is signaled to close when the circuit breaker switch is held in the "close" position.

   2. All of the paralleling conditions are satisfied.

      Note: The green LED indicates the breaker is open. The red LED indicates the breaker is closed.

      Note: The the circuit breaker switch provides a "pull-to-lock" feature. The "pull-to-lock" feature provides a constant trip signal to the breaker to lockout operation. Breaker status is indicated by LEDs that are on the switch.

5. Auto Start Lamp (19) - The auto start lamp will light if either of the following steps occur.

   1. A remote run request is present.

   2. The auto start lamp will light if the unit has been started by using the local start/stop switch.

6. Dead Bus Close Permissive Lamp (20) -

   1. In single unit mode, the dead bus close permissive lamp is "ON" when the lead unit jumper is installed. The dead bus close permissive lamp goes "OFF" when the breaker closes.

   2. In island mode, the dead bus close permissive lamp is "ON" if the following conditions are true:
      • All of the units are in standby

      • At least one unit has the lead unit jumper installed

      Note: If all of the dead bus close permissive lamps are not "ON", then inspect the interconnect wiring. The dead bus close permissive lamp for each unit will turn off as each unit is started except the unit with the lead unit jumper. If the unit with the lead unit jumper fails to close to the bus, then the permissive signal will transfer to the next unit. The dead bus close permissive lamp will illuminate in the unit that closes to the bus. The dead bus close permissive lamp will go "OFF" if any unit closes to the bus.

   3. The dead bus close permissive lamp should never be on with the control in utility parallel mode. If the dead bus close permissive lamp is on, then remove the lead unit jumper.

7. Base Load Potentiometer (21) - The base load potentiometer is used to adjust the generator kW output manually. The output range is 400 kW to 1825 kW during the parallel operation with the utility. The base load potentiometer is enabled by the left position of the base load select switch (22) .

8. Base Load Selector Switch (22) - Place this switch in the left position to use the base load potentiometer (21) for base load level reference. Place this switch in the right position to access the set point that is in the GPC "Power Controller P set1". The "Power Controller P set1" set point will provide the base load level reference.

9. Local Start/Stop Switch (23) - The local start and stop switch is used to run the unit in the auto paralleling mode locally. The EMCP 3 must be in "AUTO" mode in order to use the local start and stop switch.

Control and Load Management

Illustration 5	g02149473
(30) E-Stop push button (31) Speed potentiometer (32) Voltage Adjustment switch (33) CB3L DC breaker trip lamp (34) Fuel Level Gauge (35) Fuel Control Switch (36) Fuel Mode Switch (37) Fuel Overfill Lamp

E-Stop pushbutton (30) - Press the E-Stop pushbutton to trip open the generator breaker and immediately shut down the engine.

Speed Potentiometer (31) - The speed potentiometer is used to adjust the frequency by biasing engine speed.

Voltage Adjustment Switch (32) - The voltage adjustment switch sets the base voltage of the power module. The switch acts as the set point for voltage.

CB3L DC Breaker Trip Lamp (33) - The "CB3L DC Bkr Trip" lamp will illuminate if circuit breaker 3 (CB3) has tripped.

Fuel Level Gauge (34) - Displays the level of fuel in the fuel tank of the power module. The level is displayed as a percentage.

Fuel Control Switch (35) - With this switch in the left position, the fuel pump will unload fuel from the tank. In the right position, the fuel pump will load fuel into the tank. This switch works with the fuel mode switch.

Fuel Mode Switch (36) - The position of the fuel mode switch determines if the fuel pump will automatically transfer fuel to or from an external tank. The fuel transfer is determined by the fuel level in auto mode. If the fuel mode switch is manually held in the left position, then the fuel pump will operate regardless of the fuel level. The left position is the manual mode. The fuel mode switch is a three position switch.

Fuel Overfill Lamp (37) - The fuel overfill lamp will illuminate if the fuel tank of the power module is above 98 percent full. The fuel overfill lamp will illuminate if the pump has been locked out from pumping more fuel into the tank.

Electronic Modular Control Panel 3 (EMCP 3)

Illustration 6	g02149659
EMCP 3 Control System Panel (41) Display screen (42) AC overview key (43) Engine overview key (44) Lamp test key (45) Yellow warning lamp (46) Red Shutdown Lamp (47) Acknowledge alarm key (48) Run key (49) Auto key (50) Stop key (51) Escape key (52) Enter key (53) Right key (54) Up key (55) Down key (56) Left key

Idle/Rated Operation

The "Idle/Rated" switch enables engine idle running mode. If the switch is set to the idle position, then the engine will run at a reduced speed. Refer to Illustration 7.

Illustration 7	g02211954
Engine low idle hold

If the switch is set to the rated position, then the engine will run at the rated speed. Refer to Illustration 8.

Illustration 8	g02211973
Rated position

The "Idle/Rated" switch will prevent the radiator motor from turning when in the idle mode for only 3516 engine applications.

3516C Engines

The factory will modify the engine harness to work with the "Idle/Rated" feature. Wire number F720-E173 is to be relocated from ADEM connector J1 pin 20 to pin 61. Wire number F720-E173 is to be relocated from engine connector E-C31 pin 9 to pin 20. The wiring change is documented in the auto paralleling system schematic. The wiring change is not documented in the engine schematic.

C32 Engines

Wire number R774-A34 is must be moved from ADEM connector J1 pin 22 to pin 47. The wiring change is documented in the auto paralleling system schematic. The wiring change is not documented in the engine schematic.