Kval 979-2, System Reference Manual

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Troubleshooting Electrical Problems
979-2 63
STOP Go to START • Check for 110 VAC between #2 and #6. If there is voltage,
press the Start button. If no voltage, check the Stop button
to make sure it is all the way out and not stuck in, then check
the contact to make sure it is closed. If still no voltage, check
the wiring.
START Go to 24VDC • Push the Start button. If the Start light remains unlit, push
in the Start button and hold it in while a second person
checks for voltage between #2 and #7. If there is 110 VAC,
replace the ACR relay. If there is no voltage while the button
is held in, check the wiring.
24VDC Home the
979-2
(see)
Check between DC+ and DC- for 24VDC. If no DC voltage, disconnect the
+ Brown/Red and - Blue/Black wires from the 24VDC power supply and
check for DC voltage where those wires were disconnected.
If no voltage:
• Check the input side for 110 VAC. If no 110 VAC, check the
fuse. If there is 110 VAC and no 24VDC, replace the 24VDC
Power Supply.
If there is 24VDC:
• Reconnect the + Brown/Red and - Blue/Black wires to the
24VDC power supply.
• Trace the + Brown/Red wire to the DC terminal block.
• Disconnect all brown wires from the + DC from the DC ter-
minal block except the + Brown/Red wire form the + 24VDC
power supply.
• Check for +24VDC at between any –DC and +DC terminal
on the DC Terminal block.
• Reinstall the + brown wires one by one checking for
+24VDC after installing each + brown wire. If at any point no
voltage is found trace the last reinstalled wire and check for
shorts.