ABB PST Series, Installation And Commissioning Manual

Page: 19 / 178

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This chapter describes the softstarter in general,
specifications as well as available accessories and spare
parts.
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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 ten user languages.
The softstarter can be controlled in three ways:
• Hardware inputs control
• 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 control.
Keypad control has the highest priority and overrides the
other control methods.