safeguarding applications 18-27 two-hand control mechanical buttons, msr7r bulletin 100s, dual channel circuit status the 2 hand control buttons are not pressed and the motor is off. operating principle this is a dual channel system with monitoring of the contactors. it uses 2 double pole (n.c. & n.o.) positive mode momentary ac tion push switches. the motor can only be started when both buttons are pushed synchronously (within 0.5 sec.). if either or both buttons are relea sed, the outputs at the minotaur are opened. a1 s13 s24 x1 41 13 23 33 a2 s14 s23 x2 42 14 24 34 m k1 k2 l1 l2 l3 k1 k2 switch 1 momentary push button switch 2 momentary push button contact protection e.g. thermal cut out bulletin 100s or 700s minotaur msr7r fuses 24v ac/dc, 110v ac, 230v ac
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