ABB PST105, Installation And Commissioning Manual

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Description
Chapter 3
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Chapter 3 Description
This chapter describes the softstarter in general,
specifications as well as available accessories and spare
parts.
3:1 Overview
The PST softstarter is a microprocessor-based softstarter
designed with the latest technology for 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 by-pass contactor is integrated. In an emergency
case, it is possible to start the motor DOL with this contactor
(mind the 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 13 user languages.
The softstarter can be controlled in four ways:
• Hardware inputs control
• Keypad control (local)
• Fieldbus communication interface
• External keypad (option)
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 control.
Keypad control has the highest priority and overrides the
other control methods.