Edwards Signaling 191 User 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
2
Watts = I
• 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.
GuardSwitch™ Series 100
Non-Contact Interlock/Position Switch
191
193
191-3Z-06K
191-3Z-12K
191-4Z-06K
191-4Z-06K-D4
191-4Z-12K
191-4Z-12K-D4
191-6Z-06(K)(A)
191-6Z-12K
191-7Z-06K
191-7Z-06K-D3
191-7Z-12K
191-7Z-12K-D3
191-8Z-06K
191-8Z-12K
191-17Z-06K
191-17Z-06K-D3
191-17Z-12K
191-__________
193-__________
Dimensions
0.55''
1.40cm
0.11''
0.28cm
1.28''
3.25cm
0.17''
0.43cm
0.24''
0.61cm
4.22''
10.72cm
3.12''
7.92cm
3.75''
9.53cm
0.56cm dia.
0.22''
Figure 1
0.80''
2.03cm
0.05''
0.13cm
sensing face
sensing face
Mounting Configurations
Figure 2
Perpendicular
Actuation Door Actuation Pivot Actuation
Best Best
Good
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.
Parallel Actuation
Not Recommended
Installation
Use non-removable screws, bolts, or nuts to mount the switch and actuator. Do not
over-torque mounting hardware.
1. Using the following guidelines, determine a suitable mounting location:
• The switch and actuator must be within the listed sense range. See Ordering/
Electrical Specifications.
• The actuator must be aligned with the switch—labels facing the same direction.
(See Figure 1.)
Important:
range can be reduced 50% minimum depending on the shape and type of
material. Test the switch in specific applications to determine the actual
sense range.
•When mounting on a ferrous material (steel), a 1/4" nonferrous (plastic or
aluminum) spacer may be used under the actuator and switch to restore most of
the lost gap.
•When mounting on a hinged gate or door, mount the switch and actuator at least
6" away from the hinges to achieve the maximum movement.
• The switch and actuator must move in one of the approved directions.
See Figure 2.
• The actuator can be mounted at a 90° rotation to the switch.
When mounting in proximity to ferrous material (steel), the sense
• Do not mount for parallel actuation. An on-off-on signal may result when the
actuator passes by the switch.
2. Mount the switch on the stationary frame of the machine and connect the electrical
wiring. When mounting the switch on an ungrounded machine, connect the ground
lead to one of the mounting screws.
3. Mount the actuator on the movable guard, door, or gate.
Wire Color Codes
SPDT Black = Common
White = N.O.
Red = N.C.
DPST Circuit 1 Black, White
Circuit 2 Red, Blue
DPDT Circuit 1 Black = Common
White = N.O.
Red = N.C.
Circuit 2 Blue = Common
Yellow = N.O.
Orange = N.C
General Specifications
Enclosure Seamless 304 Stainless Steel
Temperature Range -40°F to 180°F (-40°C to 80°C)
Environmental Hermetically Sealed Contact Switch
Sealed in Polyurethane
NEMA Rating 1, 2, 3, 4, 4X, 5, 6, 12
Protection Class IP 67
Response Time 1 msec; 10msec (150VA)
Life Cycles 100,000 Under Full Load;
Up to 200,000,000 Under Dry Circuit
Lead Types/O.D. 18/2 SJTOW (K) / 0.30" (0.76cm)
18/3 SJTOW (K) / 0.33" (0.84cm)
18/4 SJTOW (K) / 0.34" (0.86cm)
3/16 Armored (A) Stainless Steel Cable with Wire Leads
18GA/0.07" (0.18cm) ea cm
UL/CSA All Models
File E 122942 LR89176
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