Service manual

Pre-operational System Testing

DCB, DCFCB and DCFCTB Models

Pre-operational System Testing

The output sound level of a siren is capable of causing severe hearing discomfort or

permanent hearing damage. Therefore, ALWAYS wear adequate hearing protection

and minimize exposure time when performing any testing or maintenance on the

siren.

Failure to properly test the siren system before placing into service may prevent the

siren from operating in an emergency. The following tests and calibrations must be

performed by an experienced technician prior to using the siren system.

Initial Sensor Adjustments and Testing

To ensure proper and reliable two-way status operation, the operation and alignment

of the sensors must be confirmed when the siren and control are installed. All of the

sensors are factory adjusted and the following alignment instructions may only

pertain to tuning replacement sensors.

Rotation Current Sensor

Locate the rotation current board (2005221) on the backplane of the control cabinet

with the blue current sensor (refer to Figure 10 DCFCTB Wiring Diagram on page

54). This board is preset at the factory and should not be adjusted.

To check the board for proper operation, do the following:

1. Verify that the output at JP2-2 is high (4 – 5VDC).

2. Activate a siren function by momentarily depressing one of the function

pushbuttons on the controller board.

3. Measure the DC voltage on TP2. The voltage should correspond to the DC

current draw of the siren motor (0.8 ADC, +/- .3 A).

4. Verify the output JP2-2 is low (0-1 VDC) for the duration of the siren function.

Chopper Current Sensor

Locate the chopper current board (2001062) on the backplane of the control cabinet

(refer to Figure 10 DCFCTB Wiring Diagram on page 54).

Adjustment Procedure

1. Using Pot 1, adjust the voltage at TP2 to 7 VDC.

2. Using Pot 2, adjust the voltage at TP4 to 4.5 VDC.