Built In Modbus Rtu; Ptc/Pt100 Temperature Sensor Input; Analogue Output - ABB PSTX Series User Manual

10. Switch the operational voltage to ON.
You can be flexible when you connect the PSTX softstarter,
but following the previous steps will enable operation of the PSTX
softstarter. You can find an example of a full installation in the graphics
section. The first 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.
1
Com 3 Temp In
T1 T2 T3
+(B) -(A)
23 24 25 26 27
Figure 1: Terminal connection
Softstarters Type PSTX30...PSTX1250 User Manual short form 1SFC132082M9901 9
Analog out
+24V + GND
28 29 30
12
13