CONTACTS, CONNECTIONS & FUSES
CONNECTIONS to a Safety Relay
NOTE
MF-2 Contacts shown when the actuator is in place.
MF-2 SAFETY SWITCH
Example connection diagram to a Safety Relay for CAT 3.
The safety relay should require 1 x N/C + 1 x N/O input with a low inrush current input switching circuit. Examples of this
type of relay are listed below
OMRON STI
SR131A / SR231A (See diagram below)
OPERATION
1 POWER ON, GATE CLOSED
When the switch has power and the actuator is in place, the
LED will be GREEN. The Normally Closed contact will be
closed and the Normally Open contact will be open.
2 POWER ON GATE OPEN
When the switch has power and the actuator is out of range,
the LED will be RED. The Normally Closed contact will be
open and the Normally Open contact will be closed.
1
2
SAFETY RELAY
SR131A / SR231A
