Service manual

Pre-operational System Testing

DCB, DCFCB and DCFCTB Models

Activate a siren function by momentarily depressing one of the function pushbuttons

on the controller board. Verify that input #4 indicator (D14) on the controller board

turns on for the duration of the siren function.

AC Power Sensor

Verify that the AC power indicator (D17) on the controller board is on while AC

power is active. Measure across F1 TB5-1 and TB5-5 for 120 VAC. Confirm that

with the AC power source turned off (via service disconnect) the AC power indicator

is off.

Intrusion Sensor

With one cabinet door open, verify that intrusion indicator (D13) is ON. Depress the

intrusion switch located on the cabinet door. With the switch depressed, confirm that

the intrusion indicator is OFF. Verify the switches on both cabinet doors operate

correctly.

Note: A jumper preset at JP9 also causes all of the LED’s to go dim when intrusion

switch is pressed.

Battery Voltage Measurement

1. Allow the batteries to charge for 24 hours to ensure they are fully charged.

2. Turn off AC power to the battery chargers by disconnecting power at the service

disconnect or opening F1 and F2 in the control cabinet.

3. Using a digital multi-meter (Fluke model 75 or equivalent), measure the batteries

individually utilizing the following test points (refer to Figure 10 DCFCTB

Wiring Diagram on page 54 for details).

TB1-1 and Chassis Ground = 13.5 VDC*

TB1-1 and TB1-2 = 13.5 VDC*

TB1-2 and TB1-3 = 13.5 VDC*

TB1-3 and TB1-4 = 13.5 VDC*

TB1-3 and TB1-4B = 13.5 VDC*

* Voltage reflects battery float voltage and varies depending on state of charge.

4. Measure the combined battery voltage between chassis ground and TB1-3. The

measured voltage depends on the batteries’ state of charge and should be

54.0 +/ 1 V.

5. While monitoring the voltage in step 4, manually activate a steady siren function

by depressing the appropriate function pushbutton on the controller board. If the

measured voltage drops below 40 VDC, it is an indication of weak batteries and

causes the controller to terminate the siren function. If a low battery condition is