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nicholasbarrettSep 23, 2025
What does 'Faulty usage' mean on my ABB PSTX720 Controller?
- MMelissa CrossSep 23, 2025
Do not use jog forward, jog backward, heat motor, or stand-still break functions with an Inside delta motor connection.
What does 'Faulty usage' mean on my ABB PSTX720 Controller?
Do not use jog forward, jog backward, heat motor, or stand-still break functions with an Inside delta motor connection.
What does it mean when my ABB PSTX720 Controller displays 'Ground fault'?
A ground fault indicates that the sum of the instantaneous line currents in your 3-phase system differs more than the specified value. Examine the motor cables and the motor itself for any issues.
What should I do if my ABB Controller displays 'Locked rotor'?
Examine the bearings of the motor and the load to ensure they run easily. A damaged bearing or a load stock could be the cause.
What does it mean when my ABB Controller displays 'Overvoltage'?
An overvoltage error indicates that the main voltage is too high. Perform a check of the main voltage.
What does it mean when my ABB PSTX720 displays 'Under voltage'?
An undervoltage error indicates that the main voltage is too low. Perform a check of the main voltage.
What does 'High current' mean on my ABB PSTX720?
A high current fault indicates that a fault current, higher than 8 times the softstarter's rated current, has occurred. Check the circuits and the motor for an insulation fault between phases or a ground fault.
What does 'Voltage imbalance' mean on my ABB PSTX720 Controller?
Voltage imbalance indicates that there is a voltage imbalance between the phases. Check the main voltage and restart the motor.
Why does my ABB Controller display 'Too long start time'?
This indicates that the time taken to soft start the motor is longer than the set value. Check the starting conditions and current limit.
How do I fix an ABB PSTX720 Controller that shows a blank screen and no LED is active?
First, ensure that the supply voltage is properly connected, referring to the circuit diagram. Also check that the RJ45 plug is connected between the HMI and the softstarter, and that the RJ45 network cable is not damaged.
What to do if my ABB PSTX720 motor is humming or starts without a given start signal?
This issue could be due to a few reasons. If it's a PSTX30...170 model, a bypass relay might be closed due to inaccurate handling. To resolve this, disconnect the operation voltage and the control supply voltage, remove the USB cable if connected, and then reconnect the voltage in the following sequence: first, the control supply voltage on terminals 1 and 2 (refer to chapter 5.1.2), wait 4 seconds, and then connect the operation voltage on terminals L1, L2, and L3. Alternatively, the bypass contactor/relay could be stuck in a closed position, or there might be a shorted thyristor. In either of these cases, it is best to speak to your ABB Sales Office.
General| Type | Softstarter |
|---|---|
| Rated operational current - In line connection | 720 A |
| Rated operational current - Inside delta connection | 1247 A |
| Control voltage | 100-250 V AC/DC |
| Service factor percentage | 100% |
| IP Class | IP00 |
| Weight | 43 kg |
| Output current | 720 A |
| Supply voltage | 208 ... 690 V |
| Rated control supply voltage | 100 ... 250 V AC |
| Operating temperature range | -25 to +60°C |
| Output voltage | 208 ... 690 V |
| Rated operational voltage | 208-690 V AC |
Provides essential safety information and warnings before installing or operating the softstarter.
Provides instructions for connecting the softstarter, including wiring diagrams.
Guides through the initial configuration of the softstarter using assistants.
Explains the procedure for starting and stopping the motor using the softstarter.
Instructions for receiving, unpacking, and inspecting the softstarter.
Covers the physical installation of the softstarter, including mounting and clearances.
Details the electrical connections for power, control, and communication.
Describes the HMI layout, keys, and indicators for operating the softstarter.
Explains how to control the softstarter directly from the HMI keypad.
Describes voltage ramp start and stop functions for smooth motor acceleration.
Explains torque ramp functionality for optimized motor control.
Lists and describes various protection functions for the softstarter and motor.
Provides an overview of fault detection functions and their indications.
Outlines procedures for service and repair, emphasizing authorized personnel.
Details the process for upgrading the softstarter's firmware.
Lists common problems, their possible causes, and solutions.
Presents circuit diagrams for PSTX softstarters in IEC and UL versions.
Illustrates various application wiring diagrams for softstarter configurations.
