Autoquip COUNTERWEIGHT SENSING SWITCH User Manual

INSTALLATION INSTRUCTIONS

COUNTERWEIGHT SENSING SWITCH

(Reference Figures 1 thru 4)

This kit has been shipped loose to be field mounted, wired, and adjusted per the
procedures below. These switches are intended to turn off the motor whenever a
counterweight attempts to come out the top of its guide tube during lift operation.

1. To install the counterweight sensing switch, first gain safe access to the top o f the
masts. There is one (1) counterweight sensing switch supplied per lift to be
mounted to one of the mast beams (typically Left) near the top of the counter weight
tube.

2. Assemble the sensing switch as shown in Figure 1. The switch is to be wired
normally closed – tripped open.

a. Mount the switch body to the counterweight tube as shown:

i. Use Figures 2a and 2b – if the lift was installed prior to 11/2006

and/or there is no sensing switch mounting plate pre-welded to the
top of the counterweight tube. Use the switch body as a template
in the position shown, mark the hole position, and drill and tap as
instructed to mount the switch with the hardware provi ded.

ii. Use Figure 3 – if the lift was purchased in 11/2006 or later and/or

there is already a sensing switch mounting plate pre-welded to the
top of the counterweight tube. Mou nt t he sw i tch body as shown
with the hardware provided.

b. Slide and/or rotate the sensing switch arm so that it is positioned over the

counterweight tube as il lust r ated.

c. Tighten the switch arm, rotate upwards and confirm that the switch

contacts open (listen for “click”) at 10-20 degrees of rotation. Adjust as
necessary

NOTE: To change the actuation direction of the switch, remove the switch head. Change

the actuating control knob/mechanism to the desired actuation direction.
(Reference Figure 1)

3. Ensure that the counterweight will in fact make contact with the switch arm as the
counterweight is pulled out the top of the square tube.

4. After installing the sensing switch, a qualified electrician should, while referencing
the lift’s electrical schematic, wire the sensing switch into the circuit:

Loosen 8-32 socket

Loosen 8-32

re-tighten

Loosen (4) flat

Switch

INSTALLATION INSTRUCTIONS

a. Use Figure 4 if the unit was installed prior to 11/2006 (or if not already

done).

b. For units installed after 11/2006, please refer to your order specific

electrical schematic for wiring details. The counterweight sensing switch
will be shown as “CW1”.

5. The switch should then be tested to make sure it is adjusted and set corr ectly. Test

the electrical continuity of the sensing switch inside the lift’s motor control panel to
make sure that:

a. the contacts in the switch are in the closed condition when in the running

position (normal, “home” position)

b. The contacts in the switch are in the open condition when in the

tripped/rotated position (switch arm must be rotated manually & held up
during testing)

Should you have any questions or need assistance please call Autoquip
Product Support (888-811-9876).

socket head
cap screw to
adjust arm
rotation, then

actuator

head cap screw to
adjust arm in and
out, then re-tighten

head machine
screws to
rotate head,
then re-tighten

Figure 1 Sensing Switch Adjustments