User manual

3
Installation
Setpoint Adjustment
The vibration switch is a safety circuit acting as a run permissive for
the fan VFD or starter. Follow lock out tag-out procedures on the fan
starting equipment.
• The trip point is factory set and may not have to be adjusted.
• To test the operation of the electrical contacts in the vibration switch
please follow the procedure below. Do not strike the device to test for
a trip.
Remove the cover to expose the inside of the switch. Using a
screwdriver, toggle the trip plate to force the electrical contacts
open and closed. The trip plate is silver, measures 1
3
⁄4" x 1" and
is located towards the bottom of the switch. With the adjusting
pin located to the left, the normally closed contact will be closed
when the right hand side of the trip plate is depressed. Check
continuity at the terminal points COMMON and NORM CLOSED or
at the fan controller to confirm contacts are operational. A typical
control circuit uses a closed contact to allow the fan to run. An
open contact means excessive vibration has occurred shutting
off the starter or VFD.
The default trip setting should allow for a full voltage start and
operation at all speeds. If the trip point is too sensitive turn the
adjusting screw clockwise
1
⁄8 of a turn increasing the g force trip
point and operate fan again.
1
⁄8 of a turn equals 1g force in change
and the range is only 5gs on most switches so do not over-turn.
Do not turn the adjusting screw anymore than half of a full turn in
either direction from factory setting.
Warning
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