4
4-5
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
The contactors K1 and K2 control the clockwise and counterclockwise motor
rotation. Both contactors are interlocked against one another by the normally
closed contacts K2 and K1. The limit switches E1 and E2 are the start/finish
limit switches. If these limit switches are activated, the motor (clockwise or
counterclockwise rotation) is switched off.
The contactors K3 and K4 switch the motor from rapid to creep speed. Both
contactors are interlocked against one another by the normally closed con-
tacts K4 and K3.
!
Caution
Interlock the line contactors against one another.
Mutual interlocking of the line contactors is shown in Figure 4-3.
If you do not observe this rule, then a short circuit can occur in the line net-
work.
Working Principle
of the Contactor
Circuit
Wiring the FM 351
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