Powered by Eaton Technology VSD Series Drives User Manual
LIT-1201828
For more information visit: www.johnsoncontrols.com B-3
November 2009
22
23
EEPROM checksum
fault
Parameter save fault
• faulty operation
• component failure
Upon reset of this fault, the VSD
Series drive will automatically
reload the parameter default
settings. Check all parameter
settings after reset. If the fault
reoccurs, contact your Johnson
Controls distributor.
25 Microprocessor
watchdog fault
• faulty operation
• component failure
Reset the fault and restart. If the
fault reoccurs, contact your
Johnson Controls distributor.
26 Start-up prevented Start-up of the drive has been
prevented.
Check Start Enable/Interlock
settings.
29 Thermistor fault The thermistor input of an
option board has detected a high
motor temperature
Check the motor cooling and the
motor loading.
Check the thermistor
connection.
(If the thermistor input of an
option board is not being used, it
must be short-circuited.)
31 IGBT temperature
hardware
IGBT Inverter Bridge
overtemperature protection has
detected high short term
overload current
Check loading.
Check motor size.
32 Fan cooling The VSD Series cooling fan did
not start when commanded
Contact your Johnson Controls
distributor.
34 CAN bus
communication
Sent message not
acknowledged
Ensure that there is another
device on the bus with the
appropriate configuration.
36 Control unit Control unit cannot control the
power unit and vise-versa
Change control unit.
37 Device change • option board changed
• different power rating of drive
Reset.
Note: No fault time data record!
38 Device added • option board added
• drive of different power rating
added
Reset.
Note: No fault time data record!
39 Device removed • option board removed
• drive removed
Reset.
Note: No fault time data record!
40 Device unknown Unknown option board or drive Contact your Johnson Controls
distributor.
41 IGBT temperature
software
IGBT Inverter Bridge
overtemperature protection has
detected high short term
overload current
Check loading.
Check motor size.
42 Brake resistor
overtemperature
Brake resistor overtemperature
protection has detected
excessive braking
Set the deceleration time longer.
Use an external brake resistor.
Table B-1: Fault Codes, continued
Fault
Code Fault Possible Cause Solution
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