Cutler-Hammer - Eaton Canada

Solutions To Drive Problems
TROUBLESHOOTING
AF93/IS903 Instruction Manual
5-4
Message Possible
Causes
IGBT SAT
GROUND FAULT
OVER CURRENT
DC LINK LOW
DC LINK HIGH
A/D OFFSET ERROR
An IGBT has pulled out of
saturation as a result of a
very low impedance short.
The short may be in the
drive, braking circuit, or
motor.
1. Motor leads shorted or
grounded.
2. Motor shorted or
grounded.
3. Over current condition.
Instantaneous current has
exceeded two times rated
current.
This indicates that the
internal DC bus has
dropped too low for safe
operation.
This indicates that the
internal DC bus is too high
for safe operation.
Analog sensing circuits
cannot auto-calibrate.
Suggested
Remedies
If fault recurs, contact your
Cutler-Hammer service
representative.
1. Check motor leads.
2. Try different motor.
3. Reduce load on motor.
1. Check for problems on
input line circuit such
as input line
transients. See
Section 2, Input Line
Considerations and
Specifications.
2. Check for motor
problems.
1. Make sure each input
line voltage phase is
present (Drive
terminals L1, L2, and
L3).
2. Check for excess line
impedance.
1. Check for high line
voltage at each input
phase (Drive terminals
L1, L2, and L3).
2. Check for regenerative
load.
If fault recurs, contact your
Cutler-Hammer service
representative.