10. Switch the operational voltage to ON.
You can be exible when you connect the PSTX softstarter,
but following the previous steps will enable operation of the PSTX
softstarter. You can nd an example of a full installation in the graphics
section. The rst one uses fuses and contactors and the second one
uses a circuit breaker.
Refer to the timing diagram graphics 13 for the basic behaviour of
PSTX softstarter.
Built in Modbus RTU
The PSTX softstarter has an RS485 physical interface (terminals 23 and 24),
that can be connected to external devices which have support for RS485 based
communication. Through this interface it is possible to control the softstarter,
retrieve status information and upload and download parameters. The softstarter
has a Modbus RTU slave implemented via the RS485 interface.
See Figure 1.
PTC/PT100 temperature sensor input
The softstarter has input terminals for PTC and PT100 elements (terminals
25, 26 and 27). Please note that both PTC and PT100 cannot be used at
the same time. See Figure 1.
Analogue output
The softstarter has one output for a configurable analog output signal
(terminals 29 and 30). The load resistance is maximum 500 ohm for current
output and minimum 500 ohm for voltage output. See Figure 1.
For instructions and programming see
1SFC132081M0201 - Softstarters Type PSTX30...PSTX1250, Installa
-
tion and Commissioning Manual available on: http://www.abb.com/
lowvoltage.
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