Siemens SIRIUS 3RF Series User Manual

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.

Siemens SIRIUS 3RF Series Specifications

General

Brand	Siemens
Model	SIRIUS 3RF Series
Category	Industrial Equipment
Language	English