Chapter 6 – Fault Tracing
ACS 502 Installation & Start-up Manual 6-3
9 OVER VOLT DC bus voltage has exceeded 130% nominal
voltage. Most common cause for this is
overvoltage (static or transient) in the input line.
Overvoltage can also result, when the motor runs
as a generator in drives where the load inertia is
extremely high and the deceleration time is set
low.
Check the input line for static or transient
overvoltages, e.g., generating loads or large
power factor correction capacitors upstream.
Use longer deceleration time or use coasting stop
function if it is compatible with the application.
If short deceleration time is needed, use Dynamic
Braking Device.
10 UNDER V 1 DC bus voltage has gone below 60% of the
nominal voltage. Most common reason for low
voltage trip is failure in the input line, e.g., loss
of one phase due to a fuse clearance. A sudden
load spike or vibrations in the load may also
cause this trip. Internal failure in the ACS 502/
504 can cause this trip.
Check input line fuses and supply. If they are
OK, an internal failure has occurred. Contact
ABB Technical Support.
11 AI < MIN Analogue input less than the minimum as set by
Parameters 10.5.1 and 10.5.5.
Input reference has failed or control wire is
broken. Check the reference circuit.
16 PWR RNGE Power range programming does not match after
replacing the Control Interface or the Main
Circuit Interface Card.
Check the Matching Card which is on top of the
Main Circuit Interface Card. Check that the start-
up data is given accordingly for the new Control
Interface Card. Remove power, wait one minute,
then restore power. If the fault persists, contact
ABB Technical support.
19 IN COMMS Failure in serial communication within the
Control Interface and/or Motor Control Cards.
Check the cabling between the Control Interface
and the Motor Control Cards. If the fault persists,
contact ABB Technical Support.
20 CON INT This fault is related to components in the Control
Interface Card.
Remove power, wait one minute, then restore
power. If the problem persists, call ABB
Technical Support.
21 MOT CONTX This fault is related to components in the Motor
Control Card or in the Converter Module.
The number replacing the X in the fault message
conveys the following information:
1 = U
2
phase current measurement problem
2 = V
2
phase current measurement problem
3 = DC-voltage measurement problem
4 = Serial communication problem
5 = Power supply problem on SNAT 777
6 = Too high ripple content in DC-voltage,
possibly caused by an input line fuse failure or
phase loss/unbalance. Check these areas. Also
make sure that the load is not vibrating. If the
fault persists, check the Input Protection Card
and/or rectifier modules.
For faults 1 – 5, remove power, wait one minute,
then restore power. If the problem persists, call
ABB Technical Support. Record the specific fault
code (X), you may be asked for it.
22 PAR REST Parameter restoring error. Parameter checksum
does not match.
Reset fault display. (The display is reset allowing
the scrolling of parameters, but the fault is not
reset.) Check all parameter settings or reset the
factory settings. Remove power, wait one
minute, then restore power and check that the
fault has disappeared.
Fault message Possible reason Remedy
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