ABB ACH550-UH HVAC User Manual - Page 4
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Fault
Code
16
17
18
19
20
21
22
23
23
24
25
26
Diagnostics
Fault Name In
Panel
Possible ground fault detected in the motor or motor cables. The drive
EARTH FAULT
monitors for ground faults while the drive is running and while the drive is
not running. Detection is more sensitive when the drive is not running and
can produce false positives.
Possible corrections:
• Check for/correct faults in the input wiring.
• Verify that motor cable does not exceed maximum specified length.
• A delta grounded input power supply and motor cables with high
capacitance may result in erroneous error reports during non-running
tests. To disable response to fault monitoring when the drive is not
running, use parameter 3023
ground fault monitoring, use parameter 3017
Motor load is lower than expected. Check for and correct:
UNDERLOAD
• Disconnected load.
• Group 37: USER LOAD CURVE.
Internal fault. The thermistor measuring the internal temperature of the
THERM FAIL
drive is open or shorted. Contact your local ABB sales representative.
Internal fault. A communication-related problem has been detected on the
OPEX LINK
fiber optic link between the OITF and OINT boards. Contact your local ABB
sales representative.
Internal fault. Low voltage condition detected on OINT power supply.
OPEX PWR
Contact your local ABB sales representative.
Internal fault. Current measurement is out of range. Contact your local ABB
CURR MEAS
sales representative.
Ripple voltage in the DC link is too high. Check for and correct:
SUPPLY PHASE
• Missing mains phase.
• Blown fuse.
Not used (Available only with encoder and parameter Group 50).
ENCODER ERR
The drive is not detecting a valid encoder signal. Check for and correct:
ENCODER ERR
• Encoder presence and proper connection (reverse wired, loose
connection, or short circuit).
• Voltage logic levels are outside of the specified range.
• A working and properly connected Pulse Encoder Interface Module,
OTAC-01.
• Wrong value entered in parameter 5001
only be detected if the error is such that the calculated slip is greater
than 4 times the rated slip of the motor.
• Encoder is not being used, but parameter 5002
(
ENABLED
Motor speed is greater than 120% of the larger (in magnitude) of 2001
OVERSPEED
MINIMUM SPEED
• Parameter settings for 2001 and 2002.
• Adequacy of motor braking torque.
• Applicability of torque control.
• Brake chopper and resistor.
Not used as of the publication of this manual.
RESERVED
Internal fault. Configuration Block Drive ID is not valid. Contact your local
DRIVE ID
ABB sales representative.
Description and Recommended Corrective Action
WIRING FAULT
).
or 2002
MAXIMUM SPEED
ACH550-UH User's Manual
. To disable response to all
.
EARTH FAULT
. A wrong value will
PULSE NR
ENCODER ENABLE
. Check for and correct:
= 1