Kval 990-H, Руководство по обслуживанию

Страница: 96 / 104

Start Light OFF
If the Start light remains unlit, push in the Start button
and hold it in while a second person checks for volt-
age between #2 and #5. If there is 120 VAC, replace
the ACR relay. If there is no voltage while the button
is held in, check the wiring or the contact on the
Start
button.
First isolate the power supply. Check between DC+
and DC- for 24VDC. If no DC voltage, disconnect
the output (V+) wire from the 24VDC power supply
and check for DC voltage where those wires were
disconnected.
If no voltage:
Check the input side for 120 VAC. If no 120 VAC, check the fuse. If there is 120
VAC and no 24VDC, replace the 24VDC Power Supply.
If there is 24VDC:
Reconnect the (V+) wire to the 24VDC power supply.
Trace the output wire to the DC terminal block.
Disconnect all (+ 24V positive) wires from the + DC from the DC terminal block
except the + output wire from the + 24VDC power supply.
Check for +24VDC at between any –DC and +DC terminal on the DC Terminal
block.
Reinstall the (+ 24V positive) wires one by one, checking for +24VDC after
installing each. If at any point no voltage is found trace the last reinstalled wire and
check for shorts.
Input 120 VAC
Output 24 VDC
24VDC Light OFF
Troubleshooting with the Status Light Panel
KVAL 990-H Service Manual
4-24