REXROTH RD 500 Series, Applications Manual

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RD 500 RD51 Troubleshooting
12-3
DOK-RD500*RD51*******-IB04-EN-P
12.5 Warning and Fault Messages–
Cause and Remedy / Comments
No. Designation Message
Cause Remedy / comments
1 External Warning / fault
If the function “no external fault” is assigned to a
digital input and if there is no 24 V signal at the digital
input, the device shuts down with fault “External” (wire
break-proof design). Determine and eliminate the cause of signal loss in the
system.
3 DC link voltage too high Fault
Regeneration of the motors in the DC link in the case
of dynamic operation.
Limit value: U
ICmax
(P0095) has been exceeded.
The set time of the descending ramp is too short.
If the fault occurs during braking, set the descending
ramp of the ramp-function generator (P0280) so that it
is slower.
Check the braking resistor (if option W exists) with the
ohmmeter; use a more efficient external braking
resistor.
Check if the braking resistor is selected (P0036)
4 DC link voltage too low Warning / fault
The DC link voltage has dropped below limit value
U
ICmin
(P0094) during operation
Slowdown or failure of power supply
Contacts of main contactor interrupted.
Mains rectifier defective
Check power supply voltage using oscilloscope
measurement.
7 Device excess temperature Warning / fault
The measured cooler temperature of the power
section
or of the mains rectifier is too high.
The fault causes a shutdown if the temperature has
exceeded the value specified in parameter D1036.73
(mains rectifier) or D1036.74 (inverter).
The difference in temperature between the warning
and the
shutdown due to the fault
can be changed
in parameter P0086. The current cooler temperatures
can be displayed using the monitor (power section =
D1870 and inverter = D2029).
Ambient temperature > 40 °C
Fan defective
Air filter clogged
NTC (temperature sensor) defective
Incorrectly set air control
Example of incorrectly set air control in P0034:
Function is on “Automatic” and the threshold value in
P0035 is set too high.
Lower the threshold value.
8 Braking resistor Fault
No acknowledgment occurs when the braking resistor
is activated.
The switching transistor or perhaps the braking
resistor is defective.
Check the BR switching transistor between terminals F
and D using a multimeter. If the BR switching transistor
is OK, the measuring result must be as follows:
from F to D: reverse voltage
from D to F: diode conduit voltage
9 Master contactor Fault
The master contactor does not pick up, drops off
during operation or does not acknowledge. Check the control voltage for the master contactor.
Check the auxiliary contact for acknowledgement.