Siemens 8DJH, Installation And Operating Instructions Manual

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Annex | 12
169/174 500-8384.9 • Version 11 • Installation and Operating Instructions • 8DJH
Tab. 53: Fault coding MCU-MH and MCU-MH-MOD
Type of fault LED status
indicator Interlocking to cir-
cuit-breaker
1)
Cause Measure
Incorrect sense of rotation
of motor Lights up per-
manently red OPEN Motor polarity interchanged ▪ Check motor connecting leads
▪ Carry out a reset of the MCU
Relay on MCU clocks on
command input (approx. 1x
per sec.) No indication OPEN No load voltage available ▪ Check the load voltage supply
Relay on MCU clocks very
quickly on command input
(approx. 5x per sec.) No indication OPEN No control voltage available ▪ Check the control voltage supply
H-bridge is not isolated from
supply Flashes 2x red CLOSED
N
2)
not earthed (IT system)
▪ Earth N.
▪ Carry out a reset of the MCU
Load voltage relay of MCU defective ▪ Replace MCU
No feedback of
disconnector contact after
disconnector CLOSED com-
mand Flashes 3x red CLOSED Disconnector could not be CLOSED
within the maximum permissible run-
time. Mechanical defect or defect at the
gear motor ▪ Check operating mechanism and
gear motor
▪ Switch the operating mechanism
manually to an end position and
perform reset
No feedback of opening
contact after
disconnector OPEN com-
mand Flashes 4x red CLOSED Disconnector could not be OPENED
within the maximum permissible run-
time. Mechanical defect or defect at the
gear motor ▪ Check operating mechanism and
gear motor
▪ Switch the operating mechanism
manually to an end position and
perform reset
No feedback of earthing
switch contact after earth-
ing switch CLOSED com-
mand Flashes 5x red CLOSED Earthing switch could not be CLOSED
within the maximum permissible run-
time. Mechanical defect or defect at the
gear motor ▪ Check operating mechanism and
gear motor
▪ Switch the operating mechanism
manually to an end position and
perform reset
No feedback of opening
contact after earth-
ing switch OPEN command Flashes 6x red CLOSED Earthing switch could not be OPENED
within the maximum permissible run-
time. Mechanical defect or defect at the
gear motor ▪ Check operating mechanism and
gear motor
▪ Switch the operating mechanism
manually to an end position and
perform reset
No standby mode after end
of command Flashes 8x red CLOSED Circuit for automatic shutdown of MCU
defective ▪ Replace MCU
Impermissibly long switch-
ing command Flashes 8x red CLOSED Switching command is applied for more
than 5 min ▪ Shorten command output
▪ Carry out a reset of the MCU
1)
Off = circuit-breaker can be switched, On = circuit-breaker cannot be switched
2)
Neutral conductor
Tab. 54: Fault coding MCU-RI
Type of fault LED status indicator Cause Measure
Incorrect sense of rotation of motor Lights up permanently
red
Motor polarity interchanged ▪ Check motor connecting leads
▪ Carry out a reset of the MCU
Relay on MCU clocks on command
input (approx. 1x per sec.) No indication No load voltage available ▪ Check the load voltage supply
Relay on MCU clocks very quickly
on command input (approx. 5x per
sec.) No indication No control voltage available ▪ Check the control voltage supply
No feedback of disconnector con-
tact after disconnector CLOSED
command Flashes 3x red Disconnector could not be CLOSED within the
maximum permissible runtime.
▪ Mechanical defect or defect at the gear
motor
▪ Check operating mechanism and
gear motor
▪ Carry out a reset of the MCU
No feedback of opening contact af-
ter disconnector OPEN command Flashes 4x red Disconnector could not be switched to OPEN
position within the maximum permissible run-
time.
▪ Mechanical defect or defect at the gear
motor
▪ Check operating mechanism and
gear motor
▪ Carry out a reset of the MCU
No standby mode after end of com-
mand Flashes 8x red Circuit for automatic shutdown of MCU defec-
tive ▪ Replace MCU
Impermissibly long switching com-
mand Flashes 8x red Switching command is applied for more than
5 min ▪ Shorten command output
▪ Carry out a reset of the MCU