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62-11637
7–86
25100
NO COMM FROM MICRO TO STP1
• ACTIVATION: Main microprocessor cannot communicate with stepper valve module over the CAN bus.
• UNIT CONTROL: Shut down and alarm. The stepper valve module status LED may be on steady green
(not pulsing) or red.
• RESET CONDITION: Auto reset when CAN communication is restored, alarm reset or alarm may be man-
ually reset by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 in
Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1.
Check Both Active and Inactive Alarms for other “NO COMM” Alarms
a. If more than one alarm, record all and proceed to step 2.
b. If this is the only “NO COMM” alarm, replace module.
2.
Check CAN Bus
a. Inspect connector pins & terminals on 1MM and 1SVM. Verify no damage or corrosion in connec-
tions.
b. Check CAN circuits:
CAN Hi: 1MM-2 through SP
−
1 to 1SVM-5
CAN Lo: 1MM-4 through SP
−
4, to 1SVM-7
CAN (+ 12 VDC): 1MM
−
8 to 1SVM
−
6.
CAN 12 VDC: negative: 1MM
−
3 to 1SVM
−
1.
3.
Check System
Clear active and inactive alarms. Start unit and monitor for additional “NO COMM” alarms.
Содержание Transicold X4 7300
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