Controls Group
507 E. Michigan Street
P.O. Box 423
Milwaukee, WI 53201
© 2009 Johnson Controls
All Rights Reserved
Printed in USA
LIT-1201858
www.johnsoncontrols.com
November 2009
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Appendix I — Fault and Warning Codes, continued
Table 10: Fault and Warning Codes/Solutions (continued)
Fault
Code Fault Possible Cause Solution
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.
43 Encoder fault Note: the exceptional Fault data record. See Active Fault
Menu for more information. Additional codes:
1 Encoder 1 channel A is missing
2 Encoder 1 channel B is missing
3 Both encoder 1 channels are missing
4 Encoder reversed
Check encoder channel connections.
Check the encoder board.
50 Analog input I
in
< 4 mA
(for signal range 4 to 20 mA)
Current at the analog input is
< 4 mA
• control cable is broken or loose
• signal source has failed
Check the current loop, signal source and wiring.
51 External fault Digital input set as an external fault input has been
triggered.
Check source of trigger.
52 Keypad communication fault The connection between the control keypad and the VSD
Series drive has been lost.
Check keypad connection and keypad cable.
53 Communication bus fault The data connection between the communication bus
master and the communication bus board has failed
Check installation.
If installation is correct, contact your Johnson Controls
distributor.
54 Slot fault Defective option board or slot Check that the board is properly installed and seated in
slot. If installation is correct, contact your Johnson
Controls distributor.
82 BypassOverLoad The motor has been overloaded while connected to the
bypass
Decrease the motor load.
Disable the Current Imbalance feature – see the IT.
manual.
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