Overview - ABB PST Installation And Maintenance Manual

Low Voltage Products & Systems
ABB Inc. • 888-385-1221 • www.abb-control.com
Chapter 3 - Description
This chapter describes the softstarter in general, specifications and available
accessories and spare parts.
3:1

Overview

The PST softstarter is a microprocessor-based softstarter designed with the
latest technology for the soft start and soft stop of squirrel cage motors. The
softstarter has several advanced motor protection features as standard.
The softstarter is designed to be used with or without a by-pass contactor except
for the larger sizes, PSTB370...1050 where the bypass contactor is integrated. In
an emergency, it is possible to start the motor across the line with the integrated
bypass contactor. See Section 3:8.4 for AC3 ratings.
The keypad on the front is designed to be as user-friendly as possible, with a
clear text display. It is possible to choose between ten different languages
(default is English).
The softstarter can be controlled in three ways:
• Hardware inputs
• Keypad control (local)
• Fieldbus communication interface
The integrated fans for cooling are operated only during ramping (start/stop) and
when the temperature of the heat sink is too high. The temperature is monitored
by a thermistor.
Only one type of control method can be enabled simultaneously.
Default selection is hardware inputs.
Keypad control has the highest priority and overrides all other control methods.
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AC 1006.9 - 5/03