Test Procedures 169
5 And 12 Volt D.C. Power Supply Test Procedure
The 5 volt and 12 volt D.C. power supply can be checked for proper operation by following
these steps.
1. Open the Main Enclosure.
2. Turn the disconnect switch ON.
3. Push the “ON” button located on the door to engage main power.
4. Locate I/O terminal blocks J19, J20 and J21 on the FTB, each of these contain a
+5VDC, +12VDC, and GND (COM) access point. Use any of these to test the 5V
and 12V power supply.
5. Measure the voltage between the common (GND) and +5VDC terminals, this
should read 4.9VDC to 5.1VDC.
6. Measure the voltage between the common (GND) and +12VDC terminals, this
should read 11.5VDC to 12.5VDC.
The following procedure may require that tests are made with the
electrical enclosures open and power turned “ON”. These tests
should only be conducted by authorized personnel who are aware
of the electrical and mechanical hazards present.
Main Enclosure
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