REFUdrive 500 RD51
Troubleshooting
7-3
DOK-RD500*-RD51*******-IB01-EN-P
7.5
Alarm- and fault messages - cause and remedy/comments
No.
Designation
Message
Cause
Remedy / Comment
1
External
Alarm / fault
If a digital input has been assigned the "no external
fault" function, and there is no 24 V signal at the
digital input, then the drive converter shuts down with
the "External" fault (this is the version which is
immune to wire breakage – i.e. fail-safe).
Define the cause of the signal loss in the plant/system
and remove.
3
DC link voltage too high
Fault
The motor regenerates into the DC link.
Limit value: UDC link max (P0095) was exceeded.
The ramp down time has been set too short.
If the fault occurs when braking, set the ramp-function
generator down ramp slower (P0280).
Brake resistor (if option W is used) using an ohmmeter,
use a higher-rating external brake resistor.
Check whether the brake resistor is selected (P0036).
4
DC link voltage too low
Alarm / fault
During operation, the DC link voltage falls below limit
value VDC link min (P0094).
•
Line supply dips or power failure.
•
Main contactor interrupted.
•
Defective line rectifier.
Check the line supply voltage using an oscilloscope.
7
Device overtemperature
Alarm / fault
The measured heatsink temperature of the power
section or the rectifier is too high.
An alarm is displayed if the heatsink temperature is
greater than 65 °C. The drive converter is shutdown if
the temperature exceeds 70 °C.
The temperature difference between the alarm and
the fault trip can be changed in parameter P0086.
The actual heatsink temperatures can be displayed
using the monitor (power section = D1870 and
rectifier = D2029).
•
Ambient temperature > 40 °C
•
Defective fan
•
Air filter blocked
•
NTC (temperature sensor) defective
•
Incorrectly set fan control
Example of an incorrectly set fan control in P0034: The
function is set to "Automatic" and the threshold in
P0035 is set too high.
Reduce the threshold
8
Brake resistor
Fault
•
When the brake resistor is controlled, there is no
checkback signal.
•
The switching transistor or the brake resistor is
defective.
•
Check the brake resistor switching transistor
between terminals F and D using a multimeter. If
the brake resistor switching transistor is OK, the
measurement results must be as follows
from F to D: Blocking voltage
from D to F: Diode let-through voltage
9
Main contactor
Fault
Main contactor does not pull-in during operation, or a
checkback signal is not received from it.
•
Check the control voltage for the main contactor.
•
Check the auxiliary contact for the checkback
signal.
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