Edwards Signaling 300 Series - Manual (Page 2)

Installation
Use non-removable screws, bolts or nuts to mount the switch
and actuator. Do no over-torque mounting hardware.
1. Position the switch and actuator so the labels are reading
in the same direction (See Figure 1).
2. Mount the switch on the stationary frame of the machine and
mount the actuator on the moveable guard, door or gate.
Keep the switch and actuator within the listed sense range.
(See Ordering Information.) See Figure 2 for recommended
mounting configurations.
3. Mounting on a ferrous material will effect the sense range
a minimum of 50%. However, a ¼” non-ferrous spacer
positioned under the magnet and/or switch should restore
most of the lost sense range.
4. For best protection against operator defeat, mount with
non-removable screws, bolts or nuts. See Ordering
Information for details.
5. Caution! When not used with a Sentrol INT relay, particular care
must be taken to determine the actual load of the switch circuit.
High voltage transients from coils, motors, contactors and
solenoids must be considered. Transient protection, such as
back-to-back zener diodes (TransZorb
® ) or an RC network, is
recommended for such loads to ensure that maximum ratings
of the switch are not exceeded. Not recommended to be used
with tungsten filament loads because of high current inrush surges.
Line capacitance and load capacitance must be considered.
Excessive line capacitance can be caused by cable lengths over
50’ when using a maximum 48 VAC. A resistor can be added in
series to limit the inrush current (at least 48 ohms for 24 Volt
applications).
- The resistor can be added in series just before the load.
- The voltage drop and the power rating of the resistor
must be considered.
Voltage drop = I•R
Watts = I 3 •R
(I = maximum continuous current of the load)
6. When mounting the switch on an ungrounded machine, ground
the switch housing by connecting your ground lead to one of the
switch mounting screws.
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 safety interlock
applications.
sensing face
sensing face
Figure 1
Mounting Configurations
Perpendicular
Actuation
Parallel
Actuation Actuation
Pivot
Actuation
Door
Best Best Good Not Recommended
S1
BLK
WHT
BLUE
RED
S2 S3
S4
CIR. 2
CIR. 1
S5
ORG
BRN
CIR. 3
S1
BLK
WHT
BLUE
RED
D1 S2 S3
S4
CIR. 2
CIR. 1
S5
ORG
BRN
CIR. 3
Optional LED
Figure 2
Actuator
Switch
Circuits*
without LED
Circuits*
with optional LED
*Circuits shown with magnet actuator away from switch.
S1 Normally open reed switch, closed when actuator
is within 0.6”
S2, S3 Normally open reed switches, will close if misaligned
or tampered with a standard magnet
S4 Biased closed reed switch, open when actuatior
is between 0.3” and 0.6”
N.O. circuit : Black and white wires.
N.C. biased tamper circuit: Red and blue wires.
N.O. monitor circuit: Orange and brown wires.
Interlock Switches_300 Series.qxd 5/29/08 1:56 PM Page 2