SVS 7HSE 110V - Manual (Page 13)

2. Loosen the thumb screw holding the Show
microswitch (bracket) in place and slide the Show
microswitch (bracket) along the Lift frame until the
large roller washer compresses the microswitch. You
should hear a slight click as you position the
microswitch over the washer and the microswitch is
compressed.
3. Moving the Show microswitch toward the rear of the
Lift raises the Show position and moving the Show
microswitch toward the front of the Lift lowers the
Show position.
4. Tighten the thumb screw. Make sure that the
microswitch is not positioned too close to the washer
because the washer must be able to pass under the
microswitch to reach the Service position.
5. The Show position is now set. Raise the Lift to a closed position and place the key switch in the Show
position and press the toggle switch down. The Lift will lower and stop at the Show position you set. It
maybe necessary to repeat steps 1 through 3 to get the Show position set where you want it.
6. The Lift will only stop at the Show position when lowering from above the Show position and not when
rising from below the Show position.
7. The Show position is adjustable with an accuracy of + /- 1/8-inch (0.32 cm).
13. MAINTENANCE AND ADJUSTMENTS
a. Maintenance
• Inspect the Lift occasionally for any loose bolts or cable clamps. The scissor bolts are adjusted for no
slack, but must not be too tight. If scissor bolts are found loose, tighten to approximately 151 lbs torque,
the back off 1/8-inch. These bolts have nylon locking nuts and should stay at this position.
• Check Lift and projector cables for damage or wear.
• Check the Drum Lock Assembly to see if the Drum Lock solenoid energizes and raises the Drum Lock
arm when you press the Down toggle switch to lower the Lift. At all other times the Drum Lock
solenoid is de-energized and the Drum Lock arm stays in its down position. If the solenoid does not pull
up, the microswitch will not allow the motor to turn when to lowering the Lift.
• Check the Drum Lock pawl (white nylon piece) located on the Cable Drum. The pawl should move
freely and drop when when it reaches the top of the Cable Drum's rotation, avoiding contact with the
Drum Lock arm. If the drum rotates too fast, the pawl will swing out and catch the arm, locking the
drum after the first rotation.
• The Cable Drum Bearings (pillow block bearings) are pre-lubricated and do not require attention.
• The Lift motor does not require attention. If the magnetic brake (part of the Lift motor) does not hold
properly, it should be replaced immediately.
SVS 7HSE Lift Installation Instructions Page 13 of 16
Figure 11