SIRIUS 3RF34 solid-state switching devices
3.4 Functions
SIRIUS Innovations
328 System Manual, 01/2011, A8E56203870002-03
3.4.1 Actuation of solid-state switching devices
Solid-state contactors
Solid-state contactors are used for the frequent switching on of motors. The switch-on
command is sent to the solid-state contactor when the control voltage is connected to
terminals A1/A2. The power semiconductors are actuated after a short dwell time has
elapsed.
Solid-state reversing contactors
The solid-state reversing contactors are dimensioned for the frequent reversing of motors.
Dependent upon which control input is activated, two pairs of power semiconductors are
actuated. If both inputs are activated at the same time, the device locks and no current will
flow. Changing from one direction of rotation to the other is locked for a period of approx. 50
to 100 ms.
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