Owner manual

ULTRA-CUT 100 XT
A-50 APPENDIX Manual 0-5272
Reasons why RAS Control relay would not close:
6. Pilotcurrentowing.Thereactuallyispilotcurrentowingsomewhere.Unlikelyasitwouldnormallyset
the208faultbutwehavetoruleitout.
a. DisconnectJ41onthePilotboard,ifHFstilldoesn’treandtheRelayboardPilotLED,D11,isstill
on,it’sduetoafaultinthedetectioncircuits.
7. Faultydetectioncircuit.Thereisn’tanypilotcurrentbutafaultinthecircuitsmeasuringpilotcurrentis
indicating there is current.
a. Measurebetweenpins8(-)and9(+)onthePilotribboncablefromRelayboardJ3toPilotboardJ42.If
there is no pilot current it should be zero. Anything else indicates the Pilot board current sensor is faulty
causing the Relay board D11 to be on. Replace the Pilot board assembly.
b. IfthePilotcurrentsignalonthepilotribboncablewaszero,measurebetweenpins23(-)and25(+)on
the40pinribboncablebetweentheRelayboardandtheCCM.Thiswouldalsonormallybezeroifthere
is no pilot current. Anything else would indicate the Relay board is faulty.
Art # 12307
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40
J23
TO RELAY BOARD
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40
J4
From I/O PCB
24VDC_SW
D21
GREEN
D23
RF ON
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5
3
4
K2
RAS CONTROL
120 VAC
120 VAC to RAS
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16
J8
120 VAC RET
120 VAC_1
From J9-1
120 VAC_RET
From J9-7
CCM I/O Board
Relay & Interface Board
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J59 - RAS
(98)
(99)
T2
120 / 6000 VAC
(98)
(99)
6.5K 1W
6.5K 1W
AC200XT only
(Rear Panel)
TP1
GND
TP1
GND
/ RAS ON
8. If“/RASON”signalislowonpin16ofthe40pinribboncable,relativetoTP1ontheCCMI/Oboard,
duringtheignitiontimethenweneedtodetermineiftheRelayboardisdefective.If/RASONsignalis
notlowtheCCMorthe40pinribboncablemaybedefective.
a. IftheRelayboardRFONLED,D23,isnotonwhilethe/RASONsignalislow,thentheRelayboardis
defective.
b. IsD23ison,measurefor120VAConJ8-3toJ8-11.IfnotpresenttheRelayboardisdefective.
c. If120VACispresentatJ8duringtheignitiontimegobackandperformsteps2-4.