11
Troubleshooting
Description and Specifications Manual
Troubleshooting
NOTE
: It is normal for the 46 Vdc output of the transformer to have 20-30 Vrms 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, 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 voltmeter to X1 and X3. Turn on AC power and measure X1 and X3.
Should measure about 100 Vac.
4. Turn off AC power to the transformer. Verify AC power has been turned off.
5. Connect voltmeter to X1 and X2. Turn on AC power and measure X1 and X2.
Should measure about 50 Vac.
6. Turn off AC power to the transformer. Verify AC power has been turned off.
7. Connect voltmeter to X3 and X2. Turn on AC power and measure X3 and X2.
Should measure about 50 Vac.
If the voltages above are incorrect, the entire transformer part number Q120246F-AL,
will need to be replaced.
If the voltages above are correct, the Diode Rectifier part number Q115336A, will need to
be replaced.
Getting Service
If you are experiencing any difficulties, contact Federal Signal Customer Care at:
800-548-7229 or 708-534-3400 extension 7511 or Technical Support at: 800-524-3021
or 708-534-3400 extension 7329 or through e-mail at: [email protected]. For
instruction manuals and information on related products, visit: http://www.fedsig.com/
