ABB PSTX Series, Installation And Commissioning Manual

Page: 165 / 188

1SFC132081M0201 | Installation and commissioning manual | Troubleshooting 165
Status Possible cause Solution
Heatsink overtemperature The heatsink temperature is too high. If the
fault stays after reset, the heatsink is too hot
and the temperature must decrease. • 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.
Bad network fault quality Excessive interference in the operation supply
network. • Do a check for harmonics or frequency interference
in the supply network and correct supply operation
network.
Short power loss on all 3 phases in the
operation network. • Do a check of the supply operation network.
Correct it.
Shunt fault The Softstarter cannot stop the motor
because of internal
short circuit. • Speak to ABB sales office for service.
Bypass relay closed, because of inaccurate
handling.
(PSTX30...170 only). • Disconnect operation voltage and control supply
voltage. Connect voltage in correct order.
• 1. Control supply voltage on terminals 1 and 2. See
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.
Low supply voltage The control supply voltage is too low on
terminals 1 and 2. • Do a check for voltage dips or interruptions and
correct control supply voltage.
Short power loss on the control supply
network. • Do a check of the control supply network for short
interruptions.
Thyristor overload The thyristors are too hot. • 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.
Short circuit thyristor 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 • 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.
Incorrect connections • Check motor wiring
Harmonics outside softstarter specification
makes false trip • Measure harmonics levels and reduce them with
filters
Bypass is closed/welded • 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.
Open circuit thyristor One or multiple thyristors do not conduct. • Speak to your ABB sales office for service.
The Operation voltage is below
175 V. • Make sure that you have the correct Softstarter for
this motor size.
The motor or load is too small • For test purposes you can use small motor mode.
See chapter 7 Functions .
Control card is broken • Speak to your ABB sales office
The control card has been replaced and the
gate cables are not attached • Verify the gate cables connections if possible
• Speak to your ABB sales office for service
Unspecified fault N/A • Disconnect the supply voltage (Us). Connect it
again and start again.
• If the same fault stays, speak to your ABB sales
office.
Faulty connection Motor connection unknown when trying to
start motor. • Change motor connection from Auto detection
to the motor connection that is used (parameter
28.43)
Faulty usage Inside delta motor connection when you try to
jog forward, jog backward, heat motor or do a
stand-still break. • Do not use these functions with Inside delta motor
connection.
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