GE Security Safety Interlock Switch 300 Series Installation Guide

Description

The 301-BT Series 300 DPST safety interlock switch is designed for use with safety monitored relays or monitored circuits. To achieve the optimum Series 300 defeat resistant feature of the 301-BT, both the switch circuit (Circuit 1) and the tamper circuit (Circuit 2) must be connected. An optional third circuit can be provided to indicate at the panel which guard is open.

Notes:

1.Environmental: Pollution Degree II

2.Correct use of this control device is an essential part of proper machine cycle control.

3.Failure to follow ALL instructions could lead to serious bodily injury or death.

4.Maintenance to be done by qualified personnel only.

5.The connecting cables between the INT devices and the switches must be located in an IP 23 type enclosure (minimum).

6.The mounting for the switch and the actuator magnet must be accomplished per this specification.

7.Non-removable hardware must be used for installation.

8.The housing of the 300-BT must be connected to the PE (Primary Earth) ground circuit via a lock washer on the mounting screw. The PE ground symbol must be placed adjacent to the screw.

Industrial Contacts

Safety Switches

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 high kilo ohm to infinity range) with the actuator within sense range. You will see the opposite reading for a normally closed switch.

Dimensions

0.98''

2.49cm

1.48''

3.76cm

0.57''

1.45cm

0.40''

1.02cm

0.67''

1.70cm

2.13''

5.41cm

0.16'' x 0.24''

0.41cm x 0.61cm slot

3.07''

7.80cm

1.75''

4.45cm

3.07''

7.80cm

0.69''

1.75cm

0.20''

0.51cm

0.74''

1.88cm

0.66''

1.68cm

Safety Interlock Switch

300 Series

301-BT 301-BT-SPNHJ6 301-BT-SPNHJ12 301-BT-SPNHJ15 301-BT-SPNHJ25 301-B3T-SPNHJ12 301-B3T-SPNHJ25

303-BT 303-BT-SPNHJ6 303-BT-SPNHJ12 303-BT-SPNHK12

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

•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.

Figure 1

Mounting Configurations

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.

sensing face

Perpendicular

Actuation

Best Best Good Not Recommended

Door Actuation

Pivot

BLK

CIR.

WHT

BLUE

CIR.

RED

BRN

CIR.

ORG

S2 S3

CIR.

BLK

WHT

BLUE

RED

BRN

ORG

Parallel

ActuationActuation

Optional LED

S2 S3

sensing face

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