Publication 2098-IN003E-EN-P — April 2004
4-8 Troubleshooting Status Indicators
E39 Self-sensing Commutation Startup Error
Motion required for self-sensing startup
commutation was obstructed.
• Verify that there are no impediments to
motion at startup, such as hard limits.
• Increase self-sensing current if high
friction or load conditions exist.
• Check motor or encoder wiring using
wiring diagnostics.
E40 230V Shunt Protection Fault
Ineffective shunt resistor • Verify that the shunt resistor (internal or
external) is connected.
• If an external shunt resistor is
connected, verify that the shunt fuse is
not blown.
• If a non Allen-Bradley external shunt
resistor is used, verify that the
resistance value is within
specifications.
• Verify that the motor is not being driven
mechanically, causing the motor to
behave as a generator.
Excessive regeneration
E41 460V Shunt Protection Fault
Ineffective shunt resistor
Excessive regeneration
E42 Motor Keying Error (SERCOS drives only)
The motor physically connected to the drive
differs from the motor specified in the user
program.
Select the correct motor in the user
program.
E43
Drive Enable Input
(SERCOS drives only)
• An attempt was made to enable the
axis through software while the Drive
Enable hardware input was inactive.
• The Drive Enable input transitioned
from active to inactive while the axis
was enabled.
• Disable the Drive Enable Input fault.
• Verify that Drive Enable hardware input
is active whenever the drive is enabled
through software.
E50
Duplicate Node Fault
(SERCOS drives only)
Duplicate node address detected on
SERCOS ring.
Verify that each SERCOS drive is assigned
a unique node address.
All others RESERVED
Call your local Allen-Bradley
representative.
Error
Code
Problem or Symptom Possible Cause(s) Action/Solution
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