Annex
116/121 Revision 05 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • 500-8067.9
Examples for flashing
code of LED status
indicator
The following table shows the fault coding of the flashing codes for all versions of the MCU.
Fault coding at the MCU
No fault signal No output of fault signals:
• If the operating mechanism is in an intermediate position due to a failure of the load voltage
while moving the operating mechanism (slow motion mechanisms). The motor control
remains switched on, and the interlocking to the circuit-breaker persists. This mode is
signaled via a yellow flashing LED status indicator.
When the load voltage returns, the operating mechanism can only be moved electrically to
OPEN position by the motor when a new command is entered.
• If the operating mechanism was moved manually from the intermediate position to a
defined end position because the load voltage failed.
①
LED lights up
permanently
②
LED flashes 1x
③
LED flashes 2x
④
LED flashes 7x
Type of failure Indication via LED
status indicator
Interlocking to the
circuit-breaker
1)
Cause Measure
Incorrect sense of rotation of
motor
Permanently red Off Motor polarity interchanged Check motor connecting leads at
the motor. Then, perform reset of
MCU
Relay on MCU clocks on command
input (approx. 1x per sec.)
none Off No load voltage available Check load voltage supply
Relay on MCU clocks very quickly
on command input (approx. 5x
per sec.)
none Off No control voltage available Check control voltage supply
H-bridge is not isolated from
supply
2x red On
N
(2)
not earthed (IT system)
Earth N. Then, perform reset of
MCU
Load voltage relay of MCU
defective
Replace MCU
No feedback of disconnector
contact after disconnector
CLOSED command
3x red On Disconnector could not be
CLOSED within the maximum
permissible runtime. Mechanical
defect or defect at the gear motor
Check operating mechanism and
gear motor. Then, switch the
operating mechanism manually to
an end position and perform reset
No feedback of opening contact
after disconnector OPEN
command
4x red On Disconnector could not be
OPENED within the maximum
permissible runtime. Mechanical
defect or defect at the gear motor
Check operating mechanism and
gear motor. Then, switch the
operating mechanism manually to
an end position and perform reset
No feedback of earthing switch
contact after
earthing switch CLOSED
command
5x red On Earthing switch could not be
CLOSED within the maximum
permissible runtime. Mechanical
defect or defect at the gear motor
Check operating mechanism and
gear motor. Then, switch the
operating mechanism manually to
an end position and perform reset
No feedback of opening contact
after earthing switch OPEN
command
6x red On Earthing switch could not be
OPENED within the maximum
permissible runtime. Mechanical
defect or defect at the gear motor
Check operating mechanism and
gear motor. Then, switch the
operating mechanism manually to
an end position and perform reset
No standby mode after end of
command
8x red On Circuit for automatic shutdown of
MCU defective
Replace MCU
Impermissibly long switching
command
8x red On Switching command is applied
for more than 5 min
Shorten command output. Then,
perform reset of MCU
1)
Off = circuit-breaker can be switched, On = circuit-breaker cannot be switched
2)
Neutral
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