Allen-Bradley Ultra3000 User Manual

Publication 2098-IN003E-EN-P — April 2004
4-6 Troubleshooting Status Indicators
E20 Motor Encoder State Error
The motor encoder encountered an illegal
transition.
• Replace the motor/encoder.
• Use shielded cables with twisted pair
wires.
• Route the feedback away from potential
noise sources.
• Check the system grounds.
• Verify that the unbuffered encoder
signals are not subjected to EMI in the
CN1 cable. Remove these signals from
the CN1 cable if they are not being
used.
• Verify that the motor has a
high-frequency bond to the drive’s
enclosure panel.
• Verify that any stage connected to the
motor shaft (for example using a ball
screw) has a high-frequency bond to the
machine frame and the drive’s
enclosure panel.
Bad encoder. Replace motor/encoder.
E21 Auxiliary Encoder state error
The auxiliary encoder encountered an
illegal transition.
• Use shielded cables with twisted pair
wires.
• Route the encoder cable away from
potential noise sources.
• Bad encoder - replace encoder.
• Check the ground connections.
Setup time violation for Step/Direction or
CW/CCW input.
Check timing of Step/Direction or CW/
CCW inputs to determine if setup time
requirements are being met.
E22 Motor Thermal Protection Fault
The internal filter protecting the motor
from overheating has tripped.
• Reduce acceleration rates.
• Reduce duty cycle (ON/OFF) of
commanded motion.
• Increase time permitted for motion.
• Use larger Ultra3000 and motor.
• Check tuning.
E23 IPM Thermal Protection Fault
The internal filter protecting the drive from
over heating has tripped.
• Reduce acceleration rates.
• Reduce duty cycle (ON/OFF) of
commanded motion.
• Increase time permitted for motion.
• Use larger Ultra3000 and motor.
• Check tuning.
E24 Excess Velocity Error Velocity error limit was exceeded.
• Increase time or size of allowable error.
• Reduce acceleration.
• Check tuning.
E25 Sensor Not Assigned
Homing or registration motion was
attempted without a sensor assigned.
Assign a sensor to a digital input.
E26 User-Specified Velocity Fault User specified velocity level was exceeded. Increase to a less restrictive setting.
E27 Axis Not Homed
Absolute positioning was attempted
without homing.
Verify homing sequence.
Error
Code
Problem or Symptom Possible Cause(s) Action/Solution

Allen-Bradley Ultra3000 Specifications

General

Brand	Allen-Bradley
Model	Ultra3000
Category	Servo Drives
Language	English