ABB PSTX Series Installation And Commissioning Manual page 165

Status
Heatsink overtemperature
Bad network fault quality
Shunt fault
Low supply voltage
Thyristor overload
Short circuit thyristor
Open circuit thyristor
Unspecified fault
Faulty connection
Faulty usage
Possible cause
The heatsink temperature is too high. If the
fault stays after reset, the heatsink is too hot
and the temperature must decrease.
Excessive interference in the operation supply
network.
Short power loss on all 3 phases in the
operation network.
The Softstarter cannot stop the motor
because of internal
short circuit.
Bypass relay closed, because of inaccurate
handling.
(PSTX30...170 only).
The control supply voltage is too low on
terminals 1 and 2.
Short power loss on the control supply
network.
The thyristors are too hot.
One or multiple thyristors are shorted due to:
- Short circuit in the main circuit
- Usage of thyristors outside the softstarter
specification
- Incorrect size of softstarter
Incorrect connections
Harmonics outside softstarter specification
makes false trip
Bypass is closed/welded
One or multiple thyristors do not conduct.
The Operation voltage is below
175 V.
The motor or load is too small
Control card is broken
The control card has been replaced and the
gate cables are not attached
N/A
Motor connection unknown when trying to
start motor.
Inside delta motor connection when you try to
jog forward, jog backward, heat motor or do a
stand-still break.
1SFC132081M0201
Solution
• Make sure that the fans work correctly.
• Make sure that airways are free from dirt and dust.
• Make sure that the ambient temperature is not too
high.
• Do a check for harmonics or frequency interference
in the supply network and correct supply operation
network.
• Do a check of the supply operation network.
Correct it.
• Speak to ABB sales office for service.
• Disconnect operation voltage and control supply
voltage. Connect voltage in correct order.
• 1. Control supply voltage on terminals 1 and 2.
chapter 5.1.2 Control supply and control circuit.
2. Wait 4 seconds, and then connect operation
voltage on terminals L1, L2 and L3.
• If same fault stays, speak to your ABB Sales Office.
• Do a check for voltage dips or interruptions and
correct control supply voltage.
• Do a check of the control supply network for short
interruptions.
• Do a check of the start conditions and the fans.
• Decrease current limit if possible.
• Let the temperature of the thyristors decrease
before you start again.
• Speak to your ABB sales office for service.
• If possible, measure the resistance on each phase
between motor and load side of the Softstarter.
If one phase is shorted there might be a shorted
thyristor or a welded contactor, see below for test.
• Check motor wiring
• Measure harmonics levels and reduce them with
filters
• Speak to your ABB sales office
• Test the bypass contactor:
1. Disconnect main. Be 100% sure that main will
not become active during the test. If it does, the
Softstarter can be harmed.
2. Maintain supply (100-250 VAC, 50/60 Hz)
3. Change parameter 28.41 to demo mode
4. Change parameter 28.38 to a motor with Ie=
corresponding to the softstarter (62.3 A by default)
5. Press L/R button to set it in local mode
6. Press green start button to make a "fake start"
7. Let it ramp up
8. Listen for the bypass relay click
9. Measure the voltage and resistance over each
phase (between L1-T1, between L2-T2 and
between L3-T3) with a megger/multimeter
10. The resistance should be close to zero since if
the bypass is closed there will be a closed circuit
and the bypass relay will work.
• Speak to your ABB sales office for service.
• Make sure that you have the correct Softstarter for
this motor size.
• For test purposes you can use small motor mode.
See chapter7 Functions.
• Speak to your ABB sales office
• Verify the gate cables connections if possible
• Speak to your ABB sales office for service
• Disconnect the supply voltage (Us). Connect it
again and start again.
• If the same fault stays, speak to your ABB sales
office.
• Change motor connection from Auto detection
to the motor connection that is used (parameter
28.43)
• Do not use these functions with Inside delta motor
connection.
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