COMMAND CHARACTERISTICS TERMINOLOGY

SERIES MP720 & DERIVATIVESPmp Additional definitions for the MP720. smp Fmp
Positive opening operation position.Actuator position at the point where the positive opening of the contacts is achieved. Position of the actuator when the pos- itive opening operation on the circuit- breaking contacts has been achieved. Position in, which pre-determined dielectric voltage rating require- ments is met between the open con- tacts in the switchable circuit. Positive opening operation travel. The minimum distance between the start of the movement of the actua- tor and the position where the posi- tive opening of the contacts is achieved. Distance between the rest position and the positive opening operation position. Positive opening operation force. The actuating force applied to the actuator to cause it to achieve the positive opening operation.

SAMPLES APPLICATIONS

? Hinged door (rotating)
The problem with fitting a positive opening operation positionswitch to a hinged door is that the switch has to be operated as the door opens. Hence, the switch cannot be operated directly by the door but rather via a notched cam. ? Industrial sliding door (lateral movement)
In this case also the switch has to be operated as the door opens. Care has to be taken to ensure that the positive opening operation switch remains in that position during the full open travel of the door. Protective doors of this type are generally used on machines oper- ating at high revolutions with cooling fluids. Consequently, it is essential in such applications that a switch with IP67 protection be used.

FITTING INSTRUCTIONS

Additional instructions supplementing those on page 6 to 15.When fitting MP720 positive opening operation position switches, accounthas to be taken of the following points:?The switch must be actuated with the minimum positive opening ope-ration travel (smp) given for each type of actuator. This travel insuresthe opening of the contacts, hence the interruption of the circuit.?The switch must be secured to a rigid support. Care must be taken toensure that the retaining screws cannot work loose in use.?The cam must be positioned and insured against maladjustment. ?The actuators must be set at the proper angle to avoid the accumulationof foreign bodies.?Components must be correctly selected according to temperatures and chemical resistance.
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