Operating instructions

OPERATION

7.1 Power Module Start-up and Testing

Once connections have been made to the power module, it should be tested for AC LINE and

STANDBY operation before placing it into service. NOTE: The power module should always

be started from utility AC (not batteries). This is because high inrush currents, associated

with the start-up of ferroresonant transformers, could place unnecessary stress on the

batteries.

7.1.1 AC Line Operation (LINE ON)

1. Plug the module’s power cord into the enclosure's AC convenience outlet and switch the

AC circuit breaker ON. The module’s LINE ON lamp will light to indicate AC LINE

operation: (Green for 60 Hz applications; Amber for 50 Hz applications).

2. Wait at least 1 minute and then reset the battery breaker on the front panel (or re-insert

the fuse). If the red STANDBY lamp flashes, press the TEST/EQ RESET switch, located

on top of the logic card (or the front panel, if equipped), once.

3. Use a true RMS voltmeter to verify AC output at pins 3 and 4 on the module's 10-pin

terminal strip. If a non-RMS voltmeter is used, the output reading can vary by as much

as 10% due to the "quasi" square wave output of the ferroresonant transformer.

4. Check the module's front panel ammeter to verify output current.

5. If the power module is equipped with an APM logic card, press the TEST/EQ RESET

switch, located on the front panel, several times until the "TEST" LED lights. This will

activate the self-test mode. If the logic card detects a problem in the battery or inverter

circuit, it will flash the module's red STANDBY lamp. It will also light a LED (located on

top of the logic card) to indicate the circuit ("DC" or "AC") that has failed self-test: DC

indicates a battery-related problem; AC indicates an inverter-related problem.

6. Press the TEST/EQ RESET switch on the front panel once to cancel self-test and

return the module to AC LINE operation. NOTE: The logic card contains an identical

TEST/EQ RESET switch, located on top of the card, that performs the same function.

7.1.2 Inverter Operation (STANDBY)

1. With the power module operating from AC LINE power, indicated by the LINE ON lamp,

unplug the module’s AC power cord or switch the AC circuit breaker OFF. The LINE ON

lamp will go OFF, indicating the loss of utility AC, and the STANDBY lamp will come ON

to signal inverter operation.

2. Use a true RMS voltmeter to verify AC output at pins 3 and 4 on the module's 10-pin

terminal strip.

3. Return the unit to AC LINE operation by plugging the AC power cord back into the

receptacle, or switch the AC circuit breaker ON. It takes approximately 1 minute for the

power module to complete its transfer back to utility power. This delay allows the

utility voltage and frequency to stabilize for approximately 30 seconds before the module’s

phase-lock circuitry is activated. It then takes up to 30 seconds for the module to

syncronize the inverter’s waveform to the utility’s. This ensures a smooth, in-

phase transfer back to utility power. The LINE ON lamp will come ON to indicate that utility

power is again available. During the transfer period, both the LINE ON and STANDBY

lamps will remain ON. When the transfer is complete, the red STANDBY lamp will turn

OFF.

7. OPERATION