Mitsubishi Electric MEsoftstart/I01 Users, Installation & Instruction Manual page 57

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Mode LED flashing at 0.5Hz
A Mode LED that is flashing at 0.5 Hz indicates that the soft starter is in Error Mode and the ERROR LED will show a flash pattern
as described below. Use this table to determine the cause of the fault.
The Error LED provides feedback on error conditions. When no error condition is detected, this LED will be off.
When an error is detected the LED will repeat a sequence of flashes specific to the error condition. The sequence
will consist of a number of 0.5s-on and 0.5s-off flashes, followed by an off-period of 1.5s.
The table below describes the number of flashes for each error condition.
Flashes
2
3
4
5
6
7
8
9
10
11
12
13
Phase detection
i.
Switch the main supply off.
ii.
Measure to ensure that all three phases of the supply voltage is present. Check Circuit breaker and measure continuity
through the fuses on each phase.
iii.
Switch main supply on.
iv.
Verify that the Phase LED comes on and stays on (not flashing).
v.
Confirm that the phase rotation is the same as the configured phase rotation on the PC Application (the default phase
rotation in Clockwise)
vi.
Re-try starting the motor.
vii.
If this error occurs repeatedly and all other checks are done, contact your distributor.
Motor underload
i.
Check the motor and the load. This error typically occurs on e.g. a pump application when the pump is running dry.
57 Basic operation – Core models
Error
Description
A motor underload condition (MULC) is detected, with the motor current
Motor underload
falling below a configured percentage e.g. 10% of the rated motor current for
a period of more than 60 seconds.
Over- or under voltage condition detected on the input voltage lines or a
Line voltage
brown-out condition was detected.
Frequency
Detected frequency differs from expected frequency by more than 5%.
Over current (start)
Current exceeds the configured current limit during ramp-up.
Total ramp-up time exceeds the limit configured. This includes the periods
Ramp Up Time
where ramping is halted due to the current limit being reached.
Motor overload
The motor protection curve for the configured protection class was violated.
Over current
Current exceeds the set current for the motor or soft start limit.
(running)
Supply voltage
Voltage levels on input lines differ from each other with more than 20%.
unbalanced
Current flow detected in a line where the switching element is switched off, or
Switching element
no current flow when the switching element or bypass contactor should be
conducting.
Internal
Internal temperature of the soft starter is high and caused the soft starter to
temperature high
trip.
Motor temperature
Motor temperature is high and caused the soft starter to trip to protect the
too high
motor.
Bypass contactor
The soft starter is configured for a bypass contactor, but the contactor did not
not present
close (when switching over after the start-ramp is completed).

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