374 Diagnostics and maintenance
ACH550-01 User's Manual
14
EXT FAULT 1 Digital input defined to report the first
external fault is active. See parameter 3003
EXTERNAL FAULT 1.
15
EXT FAULT 2 Digital input defined to report the second
external fault is active. See parameter 3004
EXTERNAL FAULT 2.
16
EARTH FAULT The load on the input power system is out of
balance.
• Check for/correct faults in the motor or
motor cable.
• Verify that motor cable does not exceed
max. specified length.
• Decrease the detection level for earth
fault with parameter 3028 earth fault lvl.
Note: Disabling ground (earth fault) may
void the warranty.
17
OBSOLETE Not used.
18
THERM FAIL Internal fault. The thermistor measuring the
internal temperature of the drive is open or
shorted. Contact your local ABB
representative.
19
OPEX LINK Internal fault. A communication-related
problem has been detected between the
control and main circuit boards. Contact your
local ABB representative.
20
OPEX PWR Internal fault. Exceptionally low voltage
detected on the main circuit board. Contact
your local ABB representative.
21
CURR MEAS Internal fault. Current measurement is out of
range. Contact your local ABB
representative.
22
SUPPLY PHASE Ripple voltage in the DC link is too high.
Check for and correct:
• missing mains phase
• blown fuse.
23
RESERVED Not used.
Fault
code
Fault name in
the panel
Description and
recommended corrective action
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