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Section 3 - Operation Liquid-cooled 15, 20 and 25 kW Generators 6. Reduce load to 3/4, 1/2, 1/4 and no load. Decrease the stability pot if there is instability at any load point. 7. Adjust differential pot to make the recovery to load changes even faster and minimize load change undershoot and overshoot. If it is set too high, it may introduce oscillations at some load. It can be set to zero (full CCW) if a small amount causes oscillations at some load. 8. Leave DIP switch 8 in TEST mode. 3.4 MANUAL RETRANSFER AND SHUTDOWN When utility power source voltage has been restored, electrical loads may be transferred back to that source and the generator can be shut down as follows: • Verify that utility power supply voltage to the transfer switch has been positively turned Off, using whatever means provided (such as utility main line circuit breaker). • Set the generator’s main circuit breaker to its Off or Open position. • Let the generator engine run at no-load for a few minutes, to stabilize internal unit temperatures. • On the generator console, set the Auto/Off/ Manual switch to Off. Wait for engine to come to a complete stop. • For transfer to utility position, refer to the Owner’s Manual of the particular transfer switch. • Turn on the utility power supply to the transfer switch, using whatever means provided (such as a utility main line circuit breaker). The utility power source now powers the loads. 3.5 AUTOMATIC OPERATION To set the system for fully automatic operation, proceed as follows: • Check that load circuits are connected to the utility power supply. • Set the AUTO/OFF/MANUAL switch to its AUTO position. • Set the generator main circuit breaker to its ON or CLOSED position. 3.6 WEEKLY EXERCISE CYCLE The engine control board will start and run the generator once every seven days for approximately 12 minutes. If utility should fail during this exercise period, the engine control board will transfer the load to the generator output and continue to run until utility returns. On the day, and at the time of day chosen for the generator to exercise, set the weekly exercise cycle as follows: 1. Place the AUTO/OFF/MANUAL switch in the AUTO position (Figure 3.3). 2. Press and hold the “Set Exercise Time” switch for five seconds, then release. At this time all five red LEDs will flash for approximately 10 seconds, then the engine will start and run for it’s 12 minute exercise period, then shut down. The generator will now start and run each week at the same time. Figure 3.3 - “Set Exercise Time” Switch SOLID GREEN LED SYSTEM READY, UTILITY POWER ON RED LED'S = INDIVIDUAL FAULT (SEE OWNER'S MANUAL FOR COMPLETE LED DETAILS) AUTO OFF OFF ON SET MANUAL EXERCISE TIME TO SET EXERCISER TIME 1) PLACE AUTO/OFF/MANUAL SWITCH TO AUTO POSITION. 2) HOLD "SET EXERCISE TIME" SWITCH IN "ON" POSITION FOR THREE SECONDS AND RELEASE. (SEE OWNER'S MANUAL FOR COMPLETE DETAILS) THE EXERCISER IS NOW SET. ALL FIVE RED LED'S WILL FLASH FOR 10 SECONDS THEN THE UNIT WILL START, RUN THROUGH THE EXERCISE CYCLE AND SHUTDOWN. If DC power to the control board is lost, the weekly exercise setting will be lost. This is indicated by all five red LEDs continually flashing. In this state the generator will still start and run in MANUAL mode, or automatically start and run if utility is lost while in AUTO mode, but it will not perform a weekly exercise cycle. If a failure occurs while running in this mode, the five red LEDs will stop flashing, the individual fault LED will turn on and the engine will shut down. Once the AUTO/OFF/MANUAL switch has been switched to OFF, the individual fault LED will turn OFF and the five red LEDs will begin flashing to show exercise has still not been set. Section 3 - Operation Liquid-cooled 15, 20 and 25 kW Generators 3.7 CONTROL BOARD DIP SWITCH SETTINGS Located on the control board is an eight position DIP switch (see Figure 3.2). The eight different switches, are used to configure the control board for the specific engine and governor being used and are pre-set at the factory. ! If the DIP switch settings are not set correctly, the generator may not start or operate correctly. 240 VAC can be present within the control panel. If it is necessary to select an alternate switch position, move the AUTO/OFF/MANUAL switch to the OFF position. Remove the 15 amp fuse in the generator control panel. Move the DIP switch position that needs to be changed to its new position. Wait five seconds, then re-install the 15 amp fuse. The ON position is marked on the switch and is shown in Figure 3.2. Switch Position 1 — Selects the generator alternator output frequency and is factory pre-set for 60 Hz. Switch Position 2 — Selects the type of transfer switch and is factory pre-set for an automatic transfer switch (ATS). Switch Position 3 — Selects the type of governor control used, and is factory pre-set for stepper motor operation. Switch Position 4 — Selects the type of fuel being used and is factory pre-set for natural gas (NG)...
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