21
Maintenance
Description, Specifications, Installation, Operation, and Service Manual
Federal Signal
www.fedsig.com
Maintenance
Testing
Federal Signal recommends periodic testing of these systems to ensure the operation is
performing as expected. Users should define the appropriate schedule for testing. FEMA
can be used to identify good practices for periodic testing requirements.
Inspection
SOUND HAZARD: Service or maintenance should be performed by qualified
personnel familiar with the siren, associated controls, and power sources being
used and in conjunction with the authorities having jurisdiction.
The sound output of sirens is capable of causing severe hearing discomfort or
permanent hearing damage. Therefore, always wear hearing protection when
performing tests or maintenance on the siren and avoid excessive exposure.
To inspect the controller:
1. Turn off AC power.
2. For the siren, visually inspect the siren air intakes and sound outlets for obstructions.
3. Ensure all connections in the Control Unit, Siren, Contactors, and Transformer/Rectifi-
er are correct and properly tightened.
4. Turn on AC power.
5. Activate the wail function. Check for proper rotation and sound of the siren. After con-
firming that the installation is complete and it has been established that the siren is
operating properly, Federal Signal recommends that all control devices be padlocked
to discourage tampering and vandalism.
Troubleshooting
NOTE: It is normal for the 46 Vdc output of the transformer to have 20-30 V
RMS
of AC
ripple without load. With load, the AC ripple significantly decreases.
If the 46 Vdc output of the transformer is about half of 46 Vdc, the typical cause is a
defective Diode Rectifier or Transformer. Lightning or a power surge may have damaged
the Diode Rectifier or Transformer.
1. Turn off AC power to the transformer. Verify AC power has been turned off.
2. Disconnect wires X1 and X3 from the Diode Rectifier and carefully protect the wires
from shorting.
3. Connect the voltmeter to X1 and X3. Turn on AC power and measure X1 and X3. They
should measure about 100 Vac.
4. Turn off AC power to the transformer. Verify AC power has been turned off.
5. Connect the voltmeter to X1 and X2. Turn on AC power and measure X1 and X2. They
should measure about 50 Vac.
6. Turn off AC power to the transformer. Verify AC power has been turned off.
