Edwards Signaling 251-F6 User Manual
www.ge-security.com/industrial
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. If the installation instructions are
not followed carefully, the switch may not work properly or fulfill its failsafe function,
or it may fail prematurely.
1. Surges from coils, motors, contactors, solenoids and tungsten filaments must be
considered.
2. 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.
3. Line capacitance and load capacitance must be considered. An in-line resistor can
be added to limit the inrush current.
4. The resistor can only be added in series with the last red wire just before the load.
5. The voltage drop and the power rating of the resistor must be considered.
Voltage drop = I • R
2
Watts = I
( I = maximum continuous current of the load)
• R
GuardSwitch™ Series 200
Non-Contact Safety Interlock Switch
251-F6
251-F6Z-06K
251-F6Z-12K
251-F6Z-14K
251-________
Dimensions
1.15''
2.92cm
0.23''
0.58cm dia
0.53''
1.35cm
Figure 1
Actuator
Switch
2.80''
7.11cm
1.75''
4.45cm
sensing face
sensing face
0.75''
1.91cm
0.28''
0.71cm
0.63''
1.60cm
1.15''
2.92cm
0.18''
0.46cm
Installation
Use non-removable screws, bolts, or nuts to mount the switch and actuator. Do not
over-torque mounting hardware.
1. Do not wire the switch until it is mounted and tested. (See Testing/Wiring)
2. Select a mounting location where the switch and actuator can be installed with
their labels reading in the same direction. (See Figure 1.)
3. Mount the switch on the stationary frame of the machine and the actuator on the
moveable guard, door or gate.
4. For best protection against operator defeat, mount with non-removeable screws,
bolts, or nuts. (See accessories)
5. The switch and actuator must be mounted so that the actuator moves in one of
the approved directions. (See Mounting Configuration, Figure 2.)
6. Parallel actuation is NOT recommended and may cause switch failure. An on/off/
on signal may result when the magnet passes by the switch rather than coming
to rest in proximity to it. (See Mounting Configuration, Figure 2.)
7. When mounting on a hinged gate or door, mount the switch and actuator at least
6" away from the hinges so a more parallel movement is achieved.
8. The actuator can be mounted at a 90° rotation.
9. Keep the switch and actuator within the listed sense range (See Ordering/
Electrical Specifications).
10. Mounting on a ferrous (steel) material will reduce the sense range a minimum of
50%. A 1/4" nonferrous (plastic or aluminum) spacer installed under the
actuator and switch will restore most of the lost gap.
11. When mounting a metal switch to an ungrounded machine, connect the ground
lead to one of the switch mounting screws.
Mounting Configurations
Figure 2
Perpendicular
Actuation
Door
Actuation
Rotated
Actuation
*
OK
* Actuation surface
OK
Three configurations are appropriate for interlock applications. The parallel
actuation can result in on/off/on signal if the actuator passes by the switch rather
than coming to rest in proximity to it. This is NOT a recommended configuration for
interlock applications.
Wiring for one FailSafe GuardSwitch
Add a 1/2 amp
caused by inrush-currents, tampering, or excessive vibration.
Figure 3
VAC/DC
fast-acting
1/2A Fuse Required*
fuse* in series to protect the switch from premature failure
Black
Red
White
Load
OK
™
FailSafe
GuardSwitch
Parallel
Actuation
NO
Wiring for two to ten FailSafe
GuardSwitches
Add a 1/2 amp
caused by inrush-currents, tampering, or excessive vibration.
Figure 4
VAC/DC
fast-acting
1/2A Fuse Required
™
in series
fuse in series to protect the switch from premature failure
Black
Red
Black
Red
Black
Red
FailSafe
GuardSwitch
FailSafe
GuardSwitch
FailSafe
GuardSwitch
White
White
White
*
Use fast-acting Littlefuse 216, fast-acting Microfuse or
fast-acting Pico II fuse up to 1/2 Amp.
GE Security Industrial
GuardSwitchTM Series 200 www.ge-security.com/industrial
Load
*
Use fast-acting Littlefuse 216, fast-acting Microfuse or
fast-acting Pico II fuse up to 1/2 Amp.
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