Siemens LMV5 Series Technical Instructions page 259

Error Diag.
Device Display
Code Code
Any #
01
02
04
05
Internal Fault
07
VSD Module
08
09
0A
VSD
A9
0C module Alarm from VSD VSD reports a fault to the VSD module
Control Range
0D Limitation
VSD Module
Section 7
Meaning for the LMV5x System
Fault with Base Unit (LMV5) VSD Module
VSD module has detected own fault and reported it to the basic
unit. Type of fault: see diagnostic code.
CRC fault during ROM test
CRC fault during RAM test
Fault during key value check
Error code for time block overflow
Sync fault or CRC fault
Error code for main loop counter
Fault during stack test
Max IRQ speed reached
VSD module could not offset speed differential within its control
limits
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Corrective Action
1) If fault occurs sporadically, reduce electrical noise.
2) If fault occurs continuously, replace LMV5.
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
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.
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.
SCC Inc.