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1-800-MAGLINE
(624-5463)
Lift
Plus
®
34
The motor works in only one direction.
Please use caution when removing covers and exposing moving parts.
Please try these steps first:
• Check for dirt and other obstructions
• Lubricate the lift screw; see pages 13-14 for instructions.
Diagnostic Instructions:
1. Remove the motor cover from the LiftPlus. Check the wire connections to the upper and lower switches
and the board. Fix any loose connections; replace any damaged wiring.
• If it will lift, but not lower - check upper limit switch (see Step 2); replace if needed
• If it will lower, but not lift:
• Check overload circuit - reset if needed
• Check lower limit switch (see Step 2); replace if needed
2. Check switch continuity - set multimeter to Continuity Test mode
• Upper limit switch
• Unplug the wire from the NC terminal on the switch (see diagram below)
• Place the black power lead on the common terminal; place the read power lead on the NC terminal
on the side of the switch. A properly working switch will show continuity when the red lead is on the
NC terminal AND the switch is not depressed. It will show incomplete circuit (open circuit) when the
read lead is touched to the NO terminal on the side of the switch AND the switch is not depressed.
• Replace if the switch is damaged.
• Lower limit switch
• Unplug the wire from the NC terminal on the switch (see diagram below)
• Place the black power lead on the common terminal; place the read power lead on the NC terminal
on the side of the switch. A properly working switch will show continuity when the red lead is on the
NC terminal AND the switch is not depressed. It will show incomplete circuit (open circuit) when the
read lead is touched to the NO terminal on the side of the switch AND the switch is not depressed.
• Replace if the switch is damaged.
• Up/Down switch (see page 16)
3. If the switches are operating correctly, then determine whether the terminals on top of the control board
are getting power to the motor.
• Connect the Multi-Meter to the motor terminals on the control board. Set the Multi-Meter range to
volts. Readings should be:
• 0 volts when switch is OFF
• 12 volts when switch is ON and Up/Down switch is pressed Up or Down.
• If the motor still only moves in one direction, contact Magline.
Motor Terminals
Common Terminal
NC
NO
Upper Switch Example
Limit Switch Diagram