Edwards Signaling 393 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.

• 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 beadded 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
( 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.

• R

GuardSwitch™ Series 300

Interlock Switch

391

391-CT-06K
391-CT-12K
391-DT-06K

391-DT-12K
391-________
393-________

393

Installation

Dimensions

0.55''

1.40cm

0.11''

0.28cm

1.28''

3.25cm

0.17''

0.43cm

0.24''

0.61cm

Figure 1

Actuator

Switch

4.22''

10.72cm

3.12''

7.92cm

3.75''

9.53cm

sensing face

sensing face

0.22''

0.56cm dia.

0.80''

2.03cm

0.05''

0.13cm

Use non-removable screws, bolts, or nuts to mount the switch and actuator. Do not
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. To determine the optimum sense range, shown
under the Ordering/Electrical Specifications for each product, attach an ohmmeter
to the black and white wires.

The meter should read “Infinity” 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 “Infinity.” 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 “on,” and the direct current (DC) from the meter may cause the switch
to latch in the “on” 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 2). Parallel actuation is NOT recommended. An on/off/
on signal may result when the actuator passes by the switch rather than coming to
rest in proximity to it.

3. Mounting on a ferrous material will effect 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.

continued

4. For best protection against operator defeat, mount with
non-removable screws, bolts or nuts (see Accessories).

5. When mounting a metal switch to an ungrounded machine, connect the ground lead
to one of the switch mounting screws.

Mounting Configurations

The interlock switch and actuator magnet should be mounted in only three
configurations for actuation.

Figure 2

Perpendicular

Actuation

Door

Actuation

Pivot Actuation

Parallel Actuation

General Specifications

Enclosure Seamless 304 Stainless Steel

Temperature Range -40°F to 180°F (-40°C to 80°C)

Environmental Hermetically Sealed Contact Switch

Encapsulated in Polyurethane

NEMA Rating 1, 2, 3, 4, 4X, 5, 6, 12

Protection Class IP 67

Response Time 1 msec (5.4VA); 10 msec (150VA)

Life Cycles 100,000 Under Full Load;

Up to 200,000,000 Under Dry Circuit

Lead Type/O.D. SJTOW (K)/18/2, 0.30" (0.76cm)

UL/CSA All Models

Best Best Not Recommended

Good

Three configurations are appropriate for safety interlock applications. The parallel
actuation can result in on/off/on signal if the magnet passes by the switch rather
than coming to rest in proximity to it. This is NOT a recommended configuration for

File E 122942

LR89176

safety interlock applications.

Accessories

PART NUMBER TAMPER PROOF SCREWS & SCREWDRIVER

1953 #6 x 3/4"L Tampruf Roundhead Screw

1954 #8 x 1-1/2"L Tampruf Roundhead Screw

1955 Tampruf® Screwdriver

1956 Tampruf® 1/4" Drive Bit for #6 and #8 Screws

Ordering/Electrical Specifications

PART NUMBER

1

391-CT-06K N.O. 2.5VA/2.5W 30V@0.08A 30V@0.08A 0.18A@13.8V 0.18A@13.8V 0.5 Ohms 0.8"(2cm) 0.1"(0.25cm) 1.2"(3.0cm) 6'(1.8m)

391-CT-12K N.O. 2.5VA/2.5W 30V@0.08A 30V@0.08A 0.18A@13.8V 0.18A@13.8V 0.5 Ohms 0.8"(2cm) 0.1"(0.25cm) 1.2"(3.0cm) 12'(3.6m)

391-DT-06K5N.O./ 150VA/NA 120V@1.25A NA 1.25A4@120V NA NA 0.8"(2cm) 0.1"(0.25cm) 1.2"(3.0cm) 6'(1.8m)

391-DT-12K5N.O./ 150VA/NA 120V@1.25A NA 1.25A4@120V NA NA 0.8"(2cm) 0.1"(0.25cm) 1.2"(3.0cm) 12'(3.6m)

Warning— Each electrical rating is an individual maximum and cannot be exceeded!

1

The part numbers 391 and 393 are the same in all respects except the cable exits, 391 left and 393 right.

2

Configuration with actuator away from the switch

3

Proximity of ferrous materials usually reduces sense range — typically by 50%. The shape and type of material cause a wide diversity of effects.
Testing is required to determine actual sense range for specific applications.

4

Can withstand inrush surge up to 4 Amps. Voltage drop is 1.5V. Minimum Switch Current 30mA.

5

Do not exceed 10 switches in series.

2

CONTACT

LOAD RATING SWITCHING VOLTAGE SWITCHING CURRENT CONTACT NOMINAL SENSE RANGE3BREAK RANGE LEAD LENGTH

CONFIG. AC/DC MAXIMUM, AC/DC MAXIMUM, AC/DC RESISTANCE Max. Min. NOMINAL NOMINAL

triac
output

triac
output

GE Security

Industrial

www.ge-security.com/industrial

12345 SW Leveton Drive
Tualatin, OR 97062
Phone: [phone]
Fax: [phone]

©2004 GE Security Industrial. GE Security Industrial reserves the right to change specifications without notice.

3897

-0204 11512 Rev D

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