WEG SSW-08 User Manual - page 50
6
Solution and Troubleshooting
SSW-08 | 45
Protection
Description and
Fault Display
Activation Description
Probable Causes
Reset
Internal
By-pass relay
contact Open
E71
(LED Fault)
Flashes 3 times
(LED Ready)
Off
When there is a fault with the internal
By-pass relay contacts at full voltage.
Loose contact in the starting cables of
the Internal By-pass relays.
Defective By-pass relay contacts due to
an overload
Power-on.
Reset key.
Auto-reset.
DIx.
Overcurrent
before the
By-pass
E72
(LED Fault)
Flashes 4 times
(LED Ready)
Off
Activates before the closing of the
By-pass if the current is greater than:
37.5 A for the SSW models up to 30 A;
200 A for the SSW models from 45
to 85 A;
260 A for the SSW model of 130 A;
400 A for the SSW models from 171
and 200 A.
824 A for the models from 255 A to
412 A.
The time programmed for the
acceleration ramp is shorter than the
actual acceleration time.
Nominal motor current higher than the
current that can be supported by the
Soft-Starter.
Motor shaft is locked, rotor blocked.
Power-on.
Reset key.
Auto-reset.
DIx.
Frequency out of
tolerance
E75
(LED Fault)
Flashes once
(LED Ready)
Off
When the limit is higher or lower than
the limits of 45 to 66 Hz.
The line frequency is out of range.
When the Soft-Starter + motor are
being supplied by a generator that is
not supporting the full load or the start
of the motor.
Power-on.
Reset key.
Auto-reset.
DIx.
Closed
By-pass contact
or shorted SCR’s
E77
(Fault LED)
flashes 6 times
(Ready LED)
Off
When the SSW-08 does not detect
voltage difference between the input
and output at the moment the motor
is switched off.
Bad contact in the relay cables.
By-pass contacts are welded.
Short-circuit Thyristor.
Input and output external short-circuit.
Disconnected motor.
Power-on.
Manual
reset
Reset key.
DIx.
NOTE!
In the case of E04 (over temperature), it is necessary to wait a little before resetting,
in order to cool down.
In the case of E05 (motor overload), it is necessary to wait a little before resetting, in
order to cool down.
Table 6.1: Faults and possible causes(cont.)