Edwards Signaling 124 GuardSwitch - Manual

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Warning! To avoid switch failure determine the actual load of the switch circuit and
take steps to protect the switch from voltage spikes, current inrush and line/load
capacitance using the following recommendations.
• Surges from coils, motors, contactors, solenoids and tungsten filaments. Transient
protection, such as back-to-back zener diodes (Transorb) or an RC network, is
recommended for such loads to ensure that maximum ratings of the switch are
not exceeded.
• Line capacitance and load capacitance. An in-line resistor can be added in series
immediately before the load to limit the inrush current. The resistor can only be
added in series with the last wire just before the load. The voltage drop and the
power rating of the resistor must also be calculated as follows:
Voltage drop = I • R
Watts = I
2 • R
( I = maximum continuous current of the load)
To verify switch operation with an ohmmeter:
Set range at 20 mega ohms (switches with triac output, set ohm range at 20 kilo
ohms). For a normally open switch, the meter will read a high impedance with the
actuator away. It will read very high to infinity range (triac switches will read high kilo
ohm to infinity range) with the actuator within sense range. You will see the opposite
reading for a normally closed switch.
Non-Contact Interlock/Position Switch
Figure 1
124-1U-03V
124-2U-03V
Installation
1. Determine the position of the switch and the actuator magnet so the labels are
end-to-end, parallel or perpendicular (see Figure 1). Do not center switch over
the actuator.
2. Mount the switch on or in the stationary frame of the machine and mount the
actuator magnet on or in the moveable guard, door or gate. For mounting in the
frame, slightly overdrill 1/4" dia. x 1-5/16" holes. Keep the switch and actuator
magnet within the listed sense range: 0.2" (0.5cm).
3. Mounting on or in ferrous material will reduce the sense range a minimum of 50%.
4. No hardware is provided with the switch or actuator magnet. 1/4" (0.6cm) pushnuts
or split-ring clamps are recommended for securing the cylindrical housing.
5. Particular care must be taken to determine the actual load of the switch circuit.
Surges from coils, motors, contactors, solenoids and tungsten filaments must be
considered. Transient protection, such as back-to-back zener diodes (Tranzorb
® ) or
an RC network, is recommended for such loads to ensure that maximum ratings of
the switch are not exceeded.
Dimensions
124 124-__________
GuardSwitch ™ Series 100
Magnet
Part No. 1803
(Included)
.38"
0.95 cm
1.13"
2.90 cm
.19"
0.482 cm
.25"
0.64 cm
End-to-End Parallel
Perpendicular
(Recommend Test for
Sense Range)
Do not center switch over magnet!
No!