Siemens SIRIUS 3RT Series System Manual page 652

SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
7.4 Functions
Function charts
3RA2811-.CW10
3RA2813-.AW10
3RA2813-.FW10
Method of operation
The set operating time t starts when the solid-state timing relay (3RA2811) with
semiconductor output is connected to the supply voltage via A3 (timing relay) and A2
(contactor). Once the time has elapsed, the semiconductor switches through and controls
the contactor below.
The supply voltage is connected to the solid-state time-delay auxiliary switch (3RA2813) via
A1/A2 (contactor). The set operating time t starts when the supply voltage is connected. The
output relay switches once the time has elapsed.
652
3RA28
A3/A2
Q
t
A1/A2
15/18
15/16
t
A1/A2
27/28
35/36
t
System Manual, 01/2011, A8E56203870002-03
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