Device Display Meaning for the LMV5x System Corrective Action
Any #
VSD module has detected own fault and reported it to the basic
unit. Type of fault: see diagnostic code.
01 CRC fault during ROM test
02 CRC fault during RAM test
04 Fault during key value check
05 Error code for time block overflow
07 Sync fault or CRC fault
08 Error code for main loop counter
09 Fault during stack test
0A Max IRQ speed reached
1) Possibly interference on the line to the speed sensor,
check cable routing, use shielded cable.
2) If fault occurs sporadically: Reduce electrical noise.
3) If fault occurs constantly: Replace LMV5
0C Alarm from VSD VSD reports a fault to the VSD module
1) This indicates that a fault has been relayed to the
LMV5 from the VSD via the VSD alarm input terminal.
This indicates a fault in the VSD, not the LMV5. Thus,
check the VSD error codes and take action based on
those codes.
2) Check VSD settings (ramps, motor settings),
increase ramp time on VSD and basic unit, if
necessary.
3) Check motor and VSD for proper sizing.
0D
Control Range
Limitation
VSD Module
VSD module could not offset speed differential within its control
limits
1) This indicates that the LMV5 has decreased its
signal to the VSD as much as possible and the motor
RPM is still too high. Increase VSD / LMV52 ramp
times. Also increase VSD braking if possible.
2) Ensure the VSD and LMV5 are configured for the
same analog signal (ex. 4-20 mA)
2) Re-standardize the speed. Ensure that the air
damper is at purge position for the standardization
(should do this automatically if the air damper is set to
air-influencing)
3) Be sure to check combustion after the re-
standardization.
Fault with Base Unit (LMV5) VSD Module
A9
VSD
module
1) If fault occurs sporadically, reduce electrical noise.
2) If fault occurs continuously, replace LMV5.
Internal Fault
VSD Module
Section 7 Page 51 SCC Inc.
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