Edwards Signaling 291-F7 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

Dimensions

0.80''

2.03cm

0.05''

0.13cm

1.28''

3.25cm

Figure 1

Actuator

Switch

0.11''

0.28cm

0.17''

0.43cm

0.55''

1.40cm

0.24''

0.61cm

4.22''

10.72cm

3.12''

7.92cm

3.75''

9.53cm

sensing face

sensing face

0.22''

0.56cm dia.

GuardSwitch™ Series 200

Patented Non-Contact
Safety Interlock Switch

291-F7Z-06K

291-F7

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 ActuatorSwitchaluminum) 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.

291-F7Z-12K
291-________

Mounting Configurations

Figure 2

Perpendicular

Actuation

Door

Actuation

Rotated

Actuation

Parallel

Actuation

*

OK OK NO

* Actuation surface

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.

OK

Wiring for one FailSafe GuardSwitch

Add a 1/2 amp
failure caused by inrush-currents, tampering, or excessive vibration.

Figure 3

VAC/DC

*

Use fast-acting Littlefuse 216, fast-acting Microfuse or

fast-acting Pico II fuse up to 1/2 Amp.

fast-acting

1/2A Fuse Required*

fuse* in series to protect the switch from premature

Black

Red

White

Load

FailSafe

GuardSwitch

™

Wiring for two to ten FailSafe
GuardSwitches

Add a 1/2 amp

fast-acting

™

in series

fuse in series to protect the switch from premature

failure caused by inrush-currents, tampering, or excessive vibration.

Figure 4

Black

1/2A Fuse Required

VAC/DC

Load

*

Use fast-acting Littlefuse 216, fast-acting Microfuse or

Red

Black

Red

Black

Red

FailSafe

GuardSwitch

FailSafe

GuardSwitch

FailSafe

GuardSwitch

White

White

White

fast-acting Pico II fuse up to 1/2 Amp.

GE Security Industrial

GuardSwitchTM Series 200 www.ge-security.com/industrial