Troubleshooting
P/N 06-237041-001 6-17 February 2011
Table 6-4. MCB-Related Output Events
MCB-Related Output Events
Error Message Probable Cause Corrective Action
SLC1 COMMUNICATIONS FAULT On
SLC2 COMMUNICATIONS FAULT On
This indicates that there has been a
communication problem between the
two processors on the control unit and
the SLC is not being monitored.
• Use the PC configuration software to
download the event log and forward
an electronic copy to Fenwal
Technical Services. Refer to the
configuration software user’s guide.
• Re-initialize the control unit by first
removing, and then re-applying,
primary and secondary power
sources
• Functionally test the system.
SLC1 OPEN CIRCUIT On
SLC2 OPEN CIRCUIT On
Open circuit in the field wiring
connected to Main Controller Board
J20 or J19. Applies to CLASS-A wiring
only
• Look for discontinuity in SLC wiring.
SLC1 SHORT CIRCUIT On
SLC2 SHORT CIRCUIT On
Short circuit in the field wiring
connected to Main Controller Board
J20 or J19
• Troubleshoot SLC wiring by
breaking-up circuit to isolate short
circuit to specific branch or leg.
AR1 OPEN CIRCUIT TROUBLE On
AR2 OPEN CIRCUIT TROUBLE On
Open circuit in field wiring connected to
Main Controller Board J17 or J18
(when R-NAC1 or R-NAC2 configured as
release circuits)
• Look for discontinuity in R-NAC1 or
R-NAC2 field wiring. Refer to
Section 2-8.7.
AR1 SHORT CIRCUIT TROUBLE On
AR2 SHORT CIRCUIT TROUBLE On
Short circuit in field wiring connected
to Main Controller Board J17 or J18
(when R-NAC1 or R-NAC2 configured as
release circuits)
• Troubleshoot R-NAC1 or R-NAC2
wiring by breaking-up circuit to
isolate short circuit to specific leg.
SG1 OPEN CIRCUIT TROUBLE On
SG2 OPEN CIRCUIT TROUBLE On
Open circuit in field wiring connected to
Main Controller Board J16 or J15
• Check for missing 10k end-of-line
resistor.
• Look for discontinuity in NAC1 or
NAC2 field wiring. Refer to
Section 2-8.6.
SG1 SHORT CIRCUIT TROUBLE On
SG2 SHORT CIRCUIT TROUBLE On
Short circuit in field wiring connected
to Main Controller Board J16 or J15
• Troubleshoot NAC1 or NAC2 wiring
by breaking-up circuit to isolate short
circuit to specific leg.
SG3 OPEN CIRCUIT TROUBLE On
SG4 OPEN CIRCUIT TROUBLE On
Open circuit in field wiring connected to
Main Controller Board J17 or J18
(when R-NAC1 or R-NAC2 configured as
NACs)
• Check for missing 10k end-of-line
resistor.
• Look for discontinuity in R-NAC1 or
R-NAC2 field wiring. Refer to
Section 2-8.7.
SG3 SHORT CIRCUIT TROUBLE On
SG4 SHORT CIRCUIT TROUBLE On
Short circuit in field wiring connected
to Main Controller Board J17 or J18
(when R-NAC1 or R-NAC2 configured as
NACs)
• Troubleshoot R-NAC1 or R-NAC2
wiring by breaking-up circuit to
isolate short circuit to specific leg.
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