Functions
5.2 Time-delayed switching of contactors
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
30 Manual, 02/2019, A5E03656507620A/RS-AD/005
Method of operation
On the electronic timing relay (3RA2812/3RA282), 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.
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