WEG SSW07 Series, User Manual, Page: 50 / 168

49
English
6.1 FAULTS AND
POSSIBLE
CAUSES
SOLUTION AND TROUBLESHOOTING
When an error is detected, the Soft-Starter is blocked (disabled)
and the LED’s indicate this error by means of intermittent flashes.
In order that the Soft-Starter operates normally again after an error
trip, it is necessary to reset it. This procedure is performed in the
following ways:

Disconnecting and reapplying the AC power (power-on RESET);

Pressing the “RESET” key in the SSW-07 front panel (RESET
key);

Automatically by the automatic RESET. Enable this function via
DIP Switch (auto);

Via digital input DI2 or DI3.
Protection
Description and
Fault Display
Activation Description Probable Causes Reset
Phase loss or
Undercurrent
E03
(LED Phase
Loss)
Flashing
At starting: It occurs when there
is no voltage in the power supply
terminals (R/1L1, S/3L2 and
T/5L3) or when the motor is
disconnected.
With the motor running: It trips
when the current stays below the
programmed value longer than
the programmed time.
Referring to the nominal motor
current.
When the parameters are set with
the factory default values, then
this protection trips after elapsing
1 second with phase loss either at
the input or at the output (motor).
It trips when the current circulating
through the SSW-07 is less than
20 % of the value adjusted at the
Motor Current trimpot.
In hydraulic pump applications, it may
be running with no load.
Phase loss in the three-phase
network.
Short-circuit or fault at the thyristor or
By-pass.
Motor not connected.
Motor connection is incorrect
Loose contact in the connections.
Starting problems with the input
contactor.
Input fuses are blown.
Incorrect programming of the Motor
Current trimpot.
Motor current consumption lower
than required for phase loss
protection to work.
Power-on.
Reset key.
Auto-reset.
DIx.
Over
temperature
in the power
section
E04
(LED Fault)
Flashes once
(LED Ready)
On
When the heatsink temperature
is superior to the limit.
Also trips when the temperature
sensor is not connected.
When the time limits given by
the time x temperature curves of
SCR protection are exceeded.
Shaft load too high.
Elevated number of successive
starts.
Internal temperature sensor not
connected.
Starting cycle requires ventilation kit
(models from 45 A to 200 A).
Power-on.
Reset key.
Auto-reset.
DIx.
Table 6.1
- Faults and possible causes
CHAPTER
6