7
operation
A slight difference of 1/16" either way creates a large change in the trip
point setting.
Turning the adjustment screw clockwise increases the trip point making the
switch less sensitive to shock. Turning the adjustment screw counter clockwise
decreases the trip point making the switch more sensitive to shock.
Adjustment — If Required
Make sure the switch is set per “Factory Setting” before making any
adjustments.
Operate fan motor as follows:
Motor starter operation (full voltage or DOL start):
• Start the fan motor. If the switch trips rotate the adjustment screw clockwise
1/4 turn, reset the switch and restart the motor.
VFD operation:
• If the VFD has a bypass motor starter follow the above procedure first using
the bypass motor starter.
• Using the VFD speed control, slowly ramp up the motor speed to full speed
allowing 5 seconds for every 2 hertz of speed change. If the switch trips
during the ramp up procedure, consider performing a vibration analysis on
the tower operation.
Rotating the adjustment screw clockwise increases the trip point. Turning
counter clockwise decreases the trip point
Note
Note
Note
Figure 3