4 Installation
4-7 Machine Control Circuit Connections
13
4-6-4 Safety Earth Connections
Both emitter and receiver must be grounded to maintain EMC immunity. This is accomplished by attaching the
safety earth wire to the inside of the emitter and receiver housing using the supplied ring lug and securing it un-
der the supplied bolt and washer which fastens to a T-nut. A 8mm(5/16 inch) box wrench is helpful in performing
this operation.
4-7 Machine Control Circuit Connections
4-7-1 Solid-state Output Connection
This unit supplies two solid-state outputs. Each output sources (PNP) up to 0.25 Amps at 24VDC.
Each solid-state output is monitored by both internal, independent micro controllers when the outputs are in the
energized state. Monitoring is accomplished by momentarily pulsing the solid-state output off for a short period.
The minimum pulse width is 50 µsec and the maximum is 200 µsec. The pulse width will automatically increase
with an increase in the load capacitance. This test pulse occurs approximately every two minutes. Any circuit
failure will be detected and both outputs will be forced to the de-energized state. T
Solid-state outputs should be connected only to a control reliable, safety rated PLC; or a control reliable safety-
rated machine control system. For a definition of control reliable, see page 1.
4-7-2 Connection Method
The following connection scheme uses both output relays to control the machine. This is the preferred wiring
method for all applications.
In your machine control circuit, locate the two Machine Primary Control Elements (MPCE). The method to arrest
hazardous machine motion will vary depending on the type of machine. Control methodologies include hydraulic,
pneumatic, clutch and mechanical braking systems. Thus there are several variations of MPCE, including relays,
contactor, solenoids and electromechanical valves.
If you are unsure of the proper connection location to use for your machine control system, contact your machine
manufacturer for assistance.
WARNING
Contact the protected machine manufacturer for assistance on how to wire a F3SS to the machine control
circuit. It is critical that the F3SS be properly connected or it will not provide maximum protection to the
machine operators and could result in serious injury. The machine control circuit wiring is the sole responsi-
bility of the employer.
Summary of Contents for F3SS
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