Edwards 300 Series Installation Instructions 2013

Series 300 Interlock Switches Instructions interlock switch and actuator should be in only three con for actuation 1 Actuation 2 Actuation Recommended Instructions Position the switch and actuator so the labels are reading in the same direction Mount the switch on the stationary frame of the machine and mount the actuator on the moveable guard door or gate To determine the optimum sense range shown under the electrical speci for each product attach an ohmmeter to the black and white wires The meter should read with the actuator away from the switch Bring the actuator toward the switch until the meter reads 0 ohms Mark this point and bring the actuator closer to the switch until the meter again reads Mark this point and position the actuator between the two marks Align the actuator with the switch so the labels read in the same direction For DT models which incorporate a triac the meter will read some resistance when the switch is and the direct current DC from the meter may cause the switch to latch in the state until the meter is disconnected The switch and actuator must be mounted so that the actuator moves in one of the approved directions Figure 1 Parallel actuation is NOT recommended An on o double actuation signal may result when the actuator passes by the switch rather than coming to rest in proximity to it Figure 2 Mounting on a ferrous material will e the sense range a minimum of 50 However a 1 4 nonferrous spacer positioned under the actuator and or switch should restore most of the lost sensor range For best protection against operator defeat mount with non removable screws bolts or nuts see Accessories When mounting a metal switch to an ungrounded machine connect the ground lead to one of the switch mounting screws Particular care must be taken to determine the load of the switch circuit from coils motors contactors solenoids and tungsten must be considered protection such as back to back zener diodes or an RC network is recommended for such loads to that maximum ratings of the switch are not exceeded capacitance and load capacitance must be considered An resistor can be added to limit the inrush current resistor can only be added in series with the last wire just the load voltage drop and the power rating of the resistor must considered drop I R I2 R maximum continuous current of the load