Siemens SIRIUS 3RH Series - OFF-Delay with Auxiliary Voltage

SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
7.4 Functions
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
653
7.4.2.2 OFF-delay with auxiliary voltage
Contacts
Function modules are available with the following contacts:
3RA2812-.DW10: 1 semiconductor output (NO contact)
3RA2814-.AW10: 1 CO contact
3RA2814-.FW10: 1 NC contact and 1 NO contact
Time ranges
The function modules support time-delayed switching from 0.05 to 100 s.
Function charts
3RA2812-.DW10
t
Q
B1/A4
A
3/A4
≥35 ms
3RA2814-.AW10
A
3/A2
15/18
15/16
t
B1/A2
≥ 35 ms
3RA2814-.FW10
A
3/A2
27/28
35/36
t
B1/A2
≥ 35 ms
Method of operation
On the solid-state timing relay (3RA2812), the supply voltage is connected via terminals
A3/A4. If the control voltage is connected to start contact B1, the semiconductor will switch
through and control the contactor below. The operating time t starts when the start contact is
disconnected. The minimum ON duration of 35 ms must be observed.
The supply voltage is connected to the solid-state time-delay auxiliary switch (3RA2814) via
terminals A3 and A2 (contactor). The output relay switches when the control voltage is
connected to the start contact B1. The operating time t starts when the start contact is
disconnected. The minimum ON duration of 35 ms must be observed.