90 AGR 070A through 100A IOMM AGR-1
Figure 39, Output Board Relay Socket
1
2
3
4
5
LED
Fuse
Test Resistor
330-680 Ohm
*250V ~ 50/60 Hz
*120V ~ 50/60 Hz
WARNING
Electric shock hazard. Can cause severe injury or death. Even when power to the panel is
off, solid-state relay socket terminals 1 and 2 on the output board could be connected to high
voltage. Avoid them.
One LED Out
If one of the Output Board LEDs fails to illuminate when the MCB is commanding the associated
output to energize, perform the following procedure:
1.
Remove power from the controller by opening CB1. Swap the suspect relay with a known good
relay. Try to choose a relay that will not affect unit operation. Restore power by closing CB1.
If the LED does not light, go to step 2.
If the LED lights, the suspect relay is defective.
2.
Remove power from the controller. Check the ribbon cable and connections between the OB and
the MCB. Look for bent pins.
If the cable and connections are intact, go to step 3.
3.
Remove the relay from the suspect socket. Install a 330-680 ohm resistor between terminals 3
and 5. Restore power by placing CB1 to the ON position. The LED should light regardless of
the controller’s command.
If the output LED illuminates, it is likely that the MCB is defective.
If the output LED does not illuminate, the output board is defective.
All LEDs Out
If the MCB is commanding at least two outputs to energize and none of the Output Board LEDs are
lit, perform the following procedure:
1.
Verify that 5 Vdc is present at the Output Board’s power terminals.
If 5 Vdc is not present, go to step 2.
If 5 Vdc is present, check the ribbon cable and connections between the output board and MCB.
Look for bent pins. If the cable and connections are intact, the Output Board or the MCB is
defective.
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