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overview
The IMI 685A mechanical switch is a shock sensitive mechanism for shutdown
of the electric fan motor. This switch uses a patented linear adjustment mag-
netic latch technology to ensure reliable operation. Pushing the reset button
moves the tripping latch into a magnetically held position. A shock/vibration
will move the magnet beyond this holding position, thus freeing the spring
loaded tripping latch to transfer the contacts and shut down the machinery.
General Features
• Designed to detect severe shock/vibration in three planes of motion
• Fully adjustable, with patented linear adjustment technology
• Includes magnetic latching feature
• Accommodates normally open (NO) and normally closed (NC)
wiring schemes
• Manual reset button with red trip indicator
• NEMA 4X (IP66) rated enclosure
• Remote options
- 24VDC Remote Reset
- 120VAC 60Hz Remote Reset
- 240VAC 50Hz Remote Reset
• Top cover is secured with socket head cap screws for easy access to
wiring terminals
If using a VFD to control fan speed, identify and lock out system resonant
frequencies during start up and commissioning. Prolonged operation at
resonant frequencies may lead to excessive vibration, equipment damage
and/or possible injury.
AC and DC input signals and power supply voltages could be hazardous.
• Do not connect live wires to screw terminal plugs
• Do not insert, remove, or handle screw terminal plugs with live wires
connected
• Do not make any adjustments to the set-point with live wires present
• Do not open the unit if fan motor is powered or running
• Do not open the unit if the relays are energized
• Do not open the unit if the reset coil is energized
• Do not make any adjustments if fan motor is energized and/or power
is present anywhere in the switch
Warning
Warning
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