WEG SSW-08 User Manual - page 48
6
Solution and Troubleshooting
SSW-08 | 43
6. SOLUTION AND TROUBLESHOOTING
6.1 FAULTS AND POSSIBLE CAUSES
When a fault is detected, the Soft-Starter is disabled and the Fault Code is displayed by flashing
LEDs.
To restart the Soft-Starter after a fault has occured it must be reset. In general, resetting can be
done as follows:
Disconnecting and reapplying the AC power (power-on RESET);
Pressing the “RESET” key in the SSW-08 front panel (RESET key);
Automatically by the automatic RESET. Enable this function via DIP Switch (auto);
Via digital input DI2 or DI3.
Table 6.1: Faults and possible causes
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.
At full voltage: 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-08 is less than 20 % of the
value adjusted at the Motor Current
trimpot.
Percentage values programmed as
maximum acceptable limit.
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.
Undersized input transformer.
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.
Shaft load too high.
Elevated number of successive starts.
Internal temperature sensor not
connected.
Power-on.
Reset key.
Auto-reset.
DIx.