ABB PSTX720 User Manual

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1SFC132081M0201

Softstarters Type PSTX30...PSTX1250

Installation and commissioning manual

Other manuals for ABB PSTX720

Spare Part Instruction8 pages

Questions and Answers:

J
Jordan Lee DDSAug 23, 2025
What causes an electronic overload in my ABB PSTX720 and how can I resolve it?
- L
  Linda SmithAug 23, 2025
  An electronic overload occurs when the motor current is too high for an extended period, often due to a high load on the motor shaft. To resolve this: * Examine start conditions and EOL settings. * Correct the reason for the overload. * Ensure the current limit level is not set too low. * Verify the ramp time for start is not too long. * Confirm the correct overload class is used. * Check that the Setting Ie parameter is correct.
D
Denise CollinsSep 1, 2025
How to troubleshoot phase loss in ABB Controller?
- B
  Brianna LaraSep 1, 2025
  Check that the mains are connected and that no line contactor or breaker is open. Inspect the fuses for all 3 phases, replacing any that are blown. Verify the operation network supply and correct it if there's a power loss on one or multiple phases. Ensure the contactor/breaker or external switch device is closed. If the line contactor opens too quickly at stop, control it with the Run signal relay on terminal 4, adding a time relay before the contactor opens. If Stop Ramp is not necessary, set Stop mode to direct stop.
E
Elizabeth ChapmanAug 31, 2025
What to do if my ABB Controller motor does not start when given a start command by the hardwire inputs?
- C
  Courtney WilliamsAug 31, 2025
  First, check the connections for start and stop. Make sure that the start and stop commands are not given at the same time. Ensure that the keypad is not in Local Control mode; if it is, push the R\L-key to change to Remote Control mode. Also, verify that the Fieldbus control parameter is set to No. Finally, reset any active or tripping events.
A
Adrienne JensenAug 29, 2025
What does 'Thyristor overload' mean on my ABB Controller?
- S
  Stephanie ShortAug 29, 2025
  A thyristor overload indicates that the thyristors are too hot. Check the start conditions and the fans. If possible, decrease the current limit. Allow the temperature of the thyristors to decrease before restarting.
M
Misty ReynoldsAug 28, 2025
What should I do if my ABB Controller displays 'Heatsink overtemperature'?
- V
  Vicki JohnsonAug 28, 2025
  Ensure that the fans are functioning correctly and that the airways are free from dirt and dust. Also, verify that the ambient temperature is not too high. If the fault persists after a reset, the heatsink is still too hot and needs to cool down.
M
Marcia GonzalesAug 27, 2025
What does it mean when my ABB PSTX720 displays 'Under voltage'?
- C
  Cynthia DavidsonAug 27, 2025
  An undervoltage error indicates that the main voltage is too low. Perform a check of the main voltage.
R
rmurrayAug 27, 2025
What does it mean when my ABB Controller displays 'Overvoltage'?
- S
  Steven WalkerAug 27, 2025
  An overvoltage error indicates that the main voltage is too high. Perform a check of the main voltage.
J
John TaylorAug 25, 2025
What should I do if my ABB Controller displays 'Locked rotor'?
- M
  Maurice RodriguezAug 26, 2025
  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.
W
William JacobsAug 25, 2025
What does it mean when my ABB PSTX720 Controller displays 'Ground fault'?
- D
  daughertychristopherAug 25, 2025
  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.

ABB PSTX720 Specifications

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

Summary

Read this first

Warning and safety

Provides essential safety information and warnings before installing or operating the softstarter.

General safety information

2 Quick start

2.1 Connection

Provides instructions for connecting the softstarter, including wiring diagrams.

2.2 Configuration

Guides through the initial configuration of the softstarter using assistants.

2.3 How to start/stop the motor

Explains the procedure for starting and stopping the motor using the softstarter.

3 Description

4 Installation

4.1 Receive, unpack and examine

Instructions for receiving, unpacking, and inspecting the softstarter.

4.2 Install

Covers the physical installation of the softstarter, including mounting and clearances.

5 Connection

5.1 Electrical connection

Details the electrical connections for power, control, and communication.

6 Human machine interface (HMI)

6.1 Navigation Overview

Describes the HMI layout, keys, and indicators for operating the softstarter.

6.2 Local control from keypad

Explains how to control the softstarter directly from the HMI keypad.

7 Functions

7.2 Voltage ramp

Describes voltage ramp start and stop functions for smooth motor acceleration.

7.3 Torque ramp

Explains torque ramp functionality for optimized motor control.

7.7 Current limit

7.11 Motor braking

7.14 Inputs/outputs

7.15 Fieldbus

7.17 Protections

Lists and describes various protection functions for the softstarter and motor.

7.18 Warnings

7.19 Faults

Provides an overview of fault detection functions and their indications.

7.22 Fast take-off

7.24 Assistants

7.25 Complete parameter list

8 Communication

8.1 Built in modbus RTU

8.2 Anybus CompactCom (option)

8.3 ABB Fieldbus plug interface (option)

9 Maintenance

9.1 Regular maintenance

9.2 Service and repair

Outlines procedures for service and repair, emphasizing authorized personnel.

9.3 Firmware upgrade

Details the process for upgrading the softstarter's firmware.

10 Troubleshooting

10.2 Troubleshooting

Lists common problems, their possible causes, and solutions.

10.3 Overview of faults, protections and warnings

10.4 Protection indication shown on screen

10.5 Fault indication shown on screen

10.6 Warning indication shown on screen

11 Wiring and application diagrams

11.1 Circuit diagram PSTX

Presents circuit diagrams for PSTX softstarters in IEC and UL versions.

11.2 Application diagrams

Illustrates various application wiring diagrams for softstarter configurations.

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