Page 327 of Current Catalog by Moeller Electric USA

06/023 safety interlock switches system overview at zb door closed personnel protection door open door is opened open door positive opening n.c 21-22 contact opens the n.c 21-22 contact is safely open even where attempts are made to tamper using basic tools 21 13 22 14 21 13 22 14 atr tkg atr ts door closed personnel protection door open opening of guard mechanism guard mechanism open closing of guard mechanism positive opening n.c 21-22 contact opens the n.c 21-22 contact is safely open even where attempts are made to tamper using basic tools enabling contact 21­22 closes 21 13 22 14 21 13 22 14 at 0-02 ft-zbz spring-powered interlock power required to deactivate interlock interlock activated interlock deactivated door open a1 a1 us a1 us a2 21 11 a2 21 11 22 12 a2 21 11 22 12 22 12 higher degree of personnel protection with separate monitoring of the door position requires no power door closed interlock also remains active under power loss or wire and interlocked breakage interlocked door safe state n.c enabling contact 21-22 is closed and allows an operation e.g machine run to start apply voltage to the coil a1 a2 e.g from a motion to release door detector the n.c enabling contact 21-22 opens the deactivate interlock n.c door monitoring contact 11-12 remains closed as long as the door remains closed only possible once it is released the n.c door monitoropening the door ing contact 11-12 opens to indicate the open door both contacts are blocked open even where attempts door is open are made to tamper using basic tools re-closing the door triple-coded actuator removes the block on the n.c enabling contact 21-22 the n.c door monitoring contact 11-12 re-closes remove voltage from coil to interlock door 1 actuator is locked in 2 the n.c enabling contact 21-22 closes the enabling contact can only close when the door is interlocked process protection and personnel protection with separate monitoring of the door position requires power door closed voltage is applied to the coil to activate interlock quickactivate interlock er access possible in the event of a power loss or wire breakage both the n.c enabling contact 21-22 and the n.c door monitoring 11-12 contact are closed remove voltage from the coil a1 a2 e.g from a moto release door tion detector the n.c enabling contact 21-22 opens deactivate interlock the n.c monitoring contact 11-12 remains closed as long as the door remains closed only possible once door is released interlock deactivatopening the door ed the n.c monitoring contact 11-12 opens to indicate the open door both contacts are blocked open even where attempts door open are made to tamper using basic tools re-closing the door triple-coded actuator removes the block on the n.c enabling contact 21-22 the n.c door monitoring contact 11-12 re-closes reapply voltage to coil to interlock door 1 actuator is locked in reactivate interlock 2 the n.c enabling contact 21-22 closes the enabling contact can only close when the door is interlocked at 0-02 mt-zbz magnet-powered interlock power required to activate interlock interlocked released open a1 us a2 a1 a1 a2 a2 21 22 21 22 21 22 11 12 11 12 11 12 limit switches door is closed the triple-coded actuator element re-closes the n.c contact

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