158 Troubleshooting | Installation and commissioning manual | 1SFC132081M0201
10.1 General
Use this chapter when problems occur with the
Softstarter or the application.
WARNING
Dangerous voltage: Can cause death or serious
injury. Always set the power switch to off and lock
out all power to this device before you start to
work on the equipment.
WARNING
Make sure that the Softstarter is de-energized
before you do maintenance.
Do not open the Softstarter or touch live parts
when the main and supply voltage is connected.
INFORMATION
ABB personnel must follow the ABB CISE 15.4
instructions
The Softstarter indicates a fault with LED Fault, and
the screen shows which type of fault occurred.
When a protection is on, the LED Protection
illuminates and the screen shows which type of
protection is active.
When a warning occurs, the screen shows the type
of warning.
In this chapter you can also find issues that the
Softstarter does not show, such as humming
sounds.
10.2 Troubleshooting
Table 1 Troubleshooting
Status Possible cause Solution
Motor humming / starts without given
start signal.
Bypass relay closed, because of
inaccurate handling.
(PSTX30...170 only).
• Disconnect the operation voltage and the control
supply voltage. Remove USB cable from the computer
if connected. Connect voltage in this sequence:
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 the fault stays, speak to your ABB Sales Office.
Bypass contactor/relay stuck in
closed position.
• Speak to your ABB Sales Office.
Shorted thyristor. • Speak to your ABB Sales Office.
Bad motor sound during start. The motor connection is not
correct.
• Examine and correct the wiring. Connect the control
supply voltage. Refer to the circuit diagram. See
chapter 11 Wiring and application diagrams.
Incorrect ramp time for start. • Try different ramp times (some adjustments can be
necessary for best result). See chapter 7 Functions.
10
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