MR380-1 Series Instruction Manual
Page 7 of 35
The E-Actuator is also sometimes referred to as a Reverse E-Stop. Optically, the MR381 E-Actuator
works in an opposite manner than the MR387 E-Stop. An activated E-Stop breaks the optical circuit
while an activated E-Actuator closes the circuit. In this way, the emergency actuation event cannot
be accidentally tripped, even in case of a system failure such as: a broken fiber, fiber disconnected
or loss of power to the controller unit.
Using the MR380-1 Controller, the Status LED is OFF when the E-Actuator is in the normal Reset
(up) position and ON when engaged (pushed down).
Only one E-Actuator sensor can be optically connected to a Controller.
1.3.
MR385 Foot Pedal and MR386 Microswitch
Figure 4. MR385 Fiber Optic Foot Pedal and MR386 Fiber Optic Microswitch
The MR385 Foot Pedal or the MR386 Fiber Optic Microswitch paired with the MR380-0 or MR380-
2 series controllers provides a new, innovative signaling detection that can be deployed in difficult,
hazardous environments and over very long distances. The Fiber Optic Micro Switch employs a
photo interrupt scheme operating over a duplex 62.5/125μm fiber optic link that allows for reliable
signal detection. This provides the same mechanical attributes typically associated with ubiquitous
electrical micro switches. It has mechanical tactile feedback when the switch toggles – essential
when precise switching points need to be set.
There are two switch types, the all non–metallic version is designed to operate within an MRI
environment where high magnetic fields would interfere with any electronic switch. The switch may
be safely used within the MRI bore because it is immune to the magnetic field as well as invisible
to the imaging process. It is also an ideal switch for deployment in highly corrosive atmospheres.
The second version employs a metallic non-magnetic spring and is capable of working over a wider
temperature range. The optical signal levels are rated inherently safe, simple mechanical devices;
allowing the system to be safely deployed in various explosive atmospheres or hazardous
locations.
