MR380-1 Series Instruction Manual
Page 5 of 35
1.
Product Description
1.1.
MR387 Fiber Optic Emergency Stop Switch
Figure 1. MR387 Series Fiber Optic Emergency Switch & MR380-1 Controller
The MR387 Emergency Stop Switch paired with MR380-1 series Controller provides a new,
innovative emergency signaling detection that can be deployed in hazardous environments and
over very long distances. The Fiber Optic E-Stop switch employs a photo interrupt scheme
operating over a duplex multimode or single mode optical link that allows for reliable signal
detection and implements a known default failure state.
The optical signal levels are rated inherently safe, allowing the sensor to be safely deployed in any
type of explosive atmosphere or hazardous location. The entire fiber optic sensor system has a
generous system loss budget, allowing for long distance, complex routing, and daisy chaining of
multiple switches.
Depressing the switch interrupts the optical signal and the Controller provides both Double Pole
Double Throw (DPDT) relay contacts and digital outputs for signal and control. The controller will
indicate if there is a broken fiber connection or depressed switch in the system which provides
increased safety margin over electrical emergency switches. The controller will always default to
the emergency state when: the switch is depressed, in case of a broken fiber, in case of a fiber
being disconnected or loss of power to the controller unit.
Multiple E-Stops may be wired in series to one Controller as long as all optical losses fall within
the optical loss budget of the Controller used.
Figure 2
provides a complete functional overview of the emergency switch system.
