Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 172)

Troubleshooting 10-9
1503-UM054C-EN-P – June 2013
Table 10.C – IE Operational Trouble Shooting Procedures (cont.)
7-Segment
Display
State Condition/Possible Cause Corrective Action
‘6’
flash
Fault Incorrect MC R
TERM
installed
1. Incorrect R
TERM
selected Set the R
TERM
resistor on only the last IntelliVAC MC
unit in an IntelliVAC MC system
‘L’+MC
address ‘1’
flash
Fault System lock-out state
Fault present, in MC system which will
not clear
Determine the fault that is occurring in the IntelliVAC
MC system and eliminate its source.
‘3’
solid
Fault Bad or no DeviceLogix program for MC
system
1. The Custom DeviceLogix module is
selected and has no program
entered.
2. The Custom DeviceLogix module is
selected and has errors.
Enter a valid program for the Custom DeviceLogix
module.
Correct any errors present in the Custom
DeviceLogix module.
‘7’+’DP’
flash
Fault Lost +15V rail from IntelliVAC Plus Basic
module
Input mains voltage is too low
Failed internal fuse
Faulty IntelliVAC Plus power supply
Check the mains input line and verify that it is
greater than the minimum operating level as defined
in the Electrical Specifications section in Appendix A.
For proper operation the input line must be greater
than 95Vrms to allow a contactor to be closed. If the
input voltage remains less than 95Vrms then
improvements to the source must be made.
Although the electronics in the IntelliVAC Plus and
IntelliVAC MC units will operate to a much lower
voltage level than 95Vrms, the contactor will not be
able to be closed at such
low levels.
Replace the internal fuse.
Replace the IntelliVAC Plus module.
‘8’+’DP’
flash
Fault Watchdog timeout – fatal error
Firmware crash occurred due to a faulty
microcontroller
Firmware crash occurred due to
excessive external EMI
Caused by a faulty microcontroller on the Enhanced
module. Replace the IntelliVAC Plus module.
Caused due to a high level of externally generated
EMI entering the wires connecting to the IntelliVAC
Plus module. Recycle the input power for both the
mains input as well as the DeviceNet power. If there
is no improvement then analyze the wiring to the
IntelliVAC Plus to determine if there is an unusual
amount of electrical noise present. If there is
excessive noise present, then rectify the situation. If
the unit still remains in a watchdog timeout fault then
replace the IntelliVAC Plus module.
MC Operational Troubleshooting Procedures
The following table identifies possible causes and corrective actions
when troubleshooting MC related faults using the IntelliVAC MC 7-
Segment LED Display.