REFUspeed RS51
Troubleshooting
9-3
DOK-RD500*-RS51*******-IB02-EN-P
9.5
Alarm and fault messages –
cause and remedy / comment
No. Designation
Cause
Message
Remedy / comments
1
External
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 a fail-safe version).
Alarm / fault
Determine the cause of the signal loss in the
plant/system and remove.
3
DC link voltage too high
Regenerative feedback of the motor into the DC link
when regenerating.
Limit value: VDClinkmax (P0095) was exceeded
The ramp downtime is set too short.
Fault
If the fault occurs when braking, set the ramp-function
generator down ramp slower (P0280).
Check the brake resistor (if option W is being 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
During operation the DC link voltage falls below the
limit value VDClinkmin (P0094).
Line supply dips or power failure.
Main contactor contact interrupted.
Defective line rectifier.
Alarm / fault
Check the line supply voltage using an oscilloscope.
7
Drive overtemperature
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
Alarm / fault
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
When the brake resistor is controlled, there is no
checkback signal.
The switching transistor or possibly the brake resistor is
defective.
Fault
Check the brake resistor switching transistor between
terminals F and D using a multimeter. If the brake
resistor switching transistor is OK, then the following
test result must be obtained:
From F to D: Blocking voltage
From D to F: Diode let-through voltage
9
Main contactor
The main contactor does not pull-in during operation,
or a checkback signal is not received from it.
Fault
Check the control voltage for the main contactor.
Check the auxiliary contact used for the checkback
signal.
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