MR ETOS ED - Page 355

10 Fault elimination
Maschinenfabrik Reinhausen GmbH 2020 3556385142/08 EN ETOS
®
ED
Characteristics/details Cause Remedy
Limit value Md-Max exceeded
▪ Event No. 1801
Error in the motor-drive unit power
supply
Check whether there is voltage on all three
phases of the power supply unit.
Error in the motor-drive unit wiring Check the RAISE/LOWER relay wiring.
Check the motor-drive unit control circuit.
Other causes (e.g. defective on-
load tap-changer)
Do not actuate the on-load tap-changer.
Export the service data and contact Maschi-
nenfabrik Reinhausen GmbH.
Immediate intervention
▪ Event No. 1884
There is an immediate need for in-
tervention.
Check pending events.
Eliminate fault in accordance with section Fault
in the motor-drive unit when the tap-change op-
eration has not been ended [►Section 10.4,
Page 350].
Electrical tap-change operation
not complete
▪ Event No. 1817
The tap changer is in an undefined
position.
Check motor protective switch and motor-drive
unit supply voltage.
Eliminate fault in accordance with section Fault
in the motor-drive unit when the tap-change op-
eration has not been ended [►Section 10.4,
Page 350].
Change-over selector operation
not completed
▪ Event No. 1885
Limit value Md-Max exceeded. The
tap changer is in an undefined po-
sition.
Check motor protective switch and motor-drive
unit supply voltage.
Eliminate fault in accordance with section Fault
in the motor-drive unit when the tap-change op-
eration has not been ended [►Section 10.4,
Page 350].
Tripping of motor protective
switch faulty
▪ Event No. 1886
The motor protective switch has
tripped, but tripping was not de-
tected.
Check the wiring and motor protective switch
settings.
Blocking faulty
▪ Event No. 1887
On-load tap-change operations
were blocked, but an on-load tap-
change operation was detected.
Check wiring and contactor K53.
Md-Max torque monitoring not
possible
▪ Event No. 1904
The Md-Max torque monitoring is
not currently possible.
The event is triggered with other events. Check
the other events in order to localize the error
search.
8-window torque monitoring not
possible
▪ Event No. 1864
The 8-window torque monitoring is
not currently possible.
The event is triggered with other events. Check
the other events in order to localize the error
search.
Blocking active
▪ Event No. 1870
On-load tap-change operations are
blocked.
The event is triggered with other events. Check
the other events in order to localize the error
search.
OLTC and MD insufficiently cen-
tered
▪ Event No. 1808
The on-load tap-changer and mo-
tor-drive unit are insufficiently cen-
tered.
Center the on-load tap-changer and motor-
drive unit in accordance with the operating in-
structions.
Motor-drive unit power supply
faulty
▪ Event No. 1871, 1872, 1881,
1882
Voltage too high or too low Check the motor-drive unit power supply.
Take measures to stabilize the voltage during
operation of the motor-drive unit (e.g. conduc-
tor lengths, conductor cross-section).