
Appendix A—Fault and Warning Codes
Variable Speed Drives Series III
LIT-12012996—April 2018
www.johnsoncontrols.com
43
65
Replace Fan
Configurable
Warning
Fan life is less than 2 months
Check the fan, clean out any
contamination, contact distributor near you
for replacement fan.
66
Safety Torque Off
Fault
STO Triggered, STO input is open.
Reset STO Trigger and verify wiring. Reset
fault after input is enabled.
67
Current Limit Control Warning
The output current has reached the current
limit value
Check the load
Set the acceleration time longer
68
Over Voltage Control Warning
The DC link voltage has reached its voltage
limit value
Check the input voltage
Set the acceleration/deceleration time
longer
69
System Fault
Fault
Thermistor SPI communication error.
Check thermistor chip.
70
System Fault
Fault
MCU send wrong parameters to DSP.
Restart the drive again. Should the fault
re-occur, contact the distributor near you.
80
FieldBus Fault
Configurable
Fault
Loss of communication with BACnet/IP, and
the fieldbus reference is the remote reference
OR the fieldbus control place is the remote
control place
Check RS-485 communication wiring.
Verify drive parameters are set correctly.
Check master programming to verify proper
addressing.
81
FieldBus Fault
Configurable
Fault
Loss of communication with SA Bus, and the
fieldbus reference is the remote reference OR
the fieldbus control place is the remote
control place
Check RS-485 communication wiring.
Verify drive parameters are set correctly.
Check master programming to verify proper
addressing.
82
Bypass Overload
Fault
Over load when motor is in bypass mode
Check motor connection situation
83
FieldBus Fault
Configurable
Fault
Loss of communication with Modbus RTU, and
the fieldbus reference is the remote reference
OR the fieldbus control place is the remote
control place
Check RS-485 communication wiring.
Verify drive parameters are set correctly.
Check master programming to verify proper
addressing.
84
FieldBus Fault
Configurable
Fault
Loss of communication with Modbus TCP, and
the fieldbus reference is the remote reference
OR the fieldbus control place is the remote
control place
Check Ethernet communication wiring.
Verify drive parameters are set correctly.
Check master programming to verify proper
addressing.
85
FieldBus Fault
Configurable
Fault
Loss of communication with BACnet, and the
fieldbus reference is the remote reference OR
the fieldbus control place is the remote
control place, and the fault protection is not
“NO action”
Check RS-485 communication wiring.
Verify drive parameters are set correctly.
Check BACnet master configuration
programming to verify proper addressing.
86
FieldBus Fault
Configurable
Fault
Loss of communication with EtherNet/IP, and
the fieldbus reference is the remote reference
OR the fieldbus control place is the remote
control place, and the fault protection is not
“NO action”
Check Ethernet communication wiring.
Verify drive parameters are set correctly.
Check EIP master configuration
programming to verify proper addressing.
87
FieldBus Fault
Configurable
Fault
Loss of communication with Profibus/
CANopen/DeviceNet master on Slot A, and
the fieldbus reference is the remote reference
OR the fieldbus control place is the remote
control place, and the fault protection is not
“NO action”
Check Profibus/CANopen/DeviceNet
communication wiring. Verify drive
parameter are set correctly. Check
Profibus/CANopen/DeviceNet master
configuration programming to verify proper
addressing.
88
FieldBus Fault
Configurable
Fault
Loss of communication with Profibus/
CANopen/DeviceNet master on Slot B, and
the fieldbus reference is the remote reference
OR the fieldbus control place is the remote
control place, and the fault protection is not
“NO action”
Check Profibus/CANopen/DeviceNet
communication wiring. Verify drive
parameter are set correctly. Check
Profibus/CANopen/DeviceNet master
configuration programming to verify proper
addressing.
89
Under Voltage Stop
Fault
The DC link voltage has reached the Drive
under voltage stop limit value.
Check the input voltage.
Table 52. Fault Codes and Descriptions, continued
Fault
Code
Fault Name
Fault Type
Default
Fault Type
Possible Cause
Remedy