Trouble Shooting
36
UNDER VOLTAGE
Trips the starter when line voltage drops below the preset level for the preset time.
Check “Under Voltage Trip “ and “Time Delay” settings, check line voltages on L
1
, L
2
,
L
3
. When voltage drops to zero, the starter trips immediately with no delay.
OVER VOLTAGE
Trips the starter when line voltage increases above a preset level for a preset time.
Check “Over Voltage Trip” and “Time Delay” settings, check line voltage on L1, L
2
, L
3
.
PHASE LOSS
Trips the starter if 1 or 2 phases are missing. Check line voltages related to terminal 21 is
connected correctly (see page 8). Check that frequency variations are between 40-65Hz.
PHASE SEQUENCE
Trips the starter if line phase sequence is wrong. Check line phase sequence, and if wrong,
swap two wires on line
side. If motor now rotates in the wrong direction, swap two wires
on load
side.
MAX SLOW SP
TIME
Trips the starter when operating at slow speed for extended period of time.
Check that operation time at Slow Speed is shorter than “Max Slow Speed Time” setting.
Note: Motor and starter may be overheated when operating at slow speed for an extended
period.
WRONG
CONNECTION
Trips the starter when one or more motor phases is not properly connected to starter’s load
terminals or in case of internal disconnection in motor winding. If required, may be
eliminated by using Dip Sw # 3 and wiring the soft-starter in generator mode
(programming D.A. parameters accordingly*).
SHORTED SCR
Trips the starter and prevents starting if any SCR is short-circuited or when motor
windings are shorted.
Check with an ohmmeter between L
1
-U, L
2
-V, L
3
-W; resistance > 20 K.
Check for no voltage on terminals U, V, W (from parallel system or an independent by-
pass).
SCRs may fail due to: * High short current not protected by proper fuses
* High voltage spikes not protected by proper external Varistors.
* Frequent starting at maximum conditions or fault conditions.
OVER
TEMPERATURE
Heat-sink over-temperature. Trips the starter when heat-sink temp. rises above 85˚C.
Improve cooling or use a by-pass contactor. Check that motor starting is not too frequent.
EXTERNAL FAULT
Trips the starter when a N.O contact between terminals 19-21 closes for over two seconds.
Check contact position and cause of closure.
WRONG
PARAMETERS
Parameters not transferred from RAM to EEPROM or vice versa. After replacing the
EPROM with a new software version or after power up, press Reset, than Mode and
simultaneously and save the default parameters by pressing Store and Mode
simultaneously.
(If Fault LED is on, press Reset after strong parameters).
* NOTE:
When operating in generator mode, Shorted SCR and Wrong Connection faults are not
active.
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