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P a g e
TRUS<T>LIFT™ 750 LIMITED MAINTENACE MANUAL REVISION A, 16AUG2016
case there is something wrong with the switch or wiring and a trouble shoo
ti
ng exercise
should be undertaken.
Lastly, check that the rod engages fully with the limit switch plate.
4.4
4.5
Check Drive Nut Switch
Verify that as the pla
tf
orm/ mechanical stops come in to contact with he founda
ti
on the
limit switch is engaged with the red safety bracket and that this cuts power to the motor.
Also verify that the drive screw stops spinning prior to the drive nut bolts hi
tti
ng the end
of the slots in the guide frame.
If the drive nut bolts hit the end of the slots before the screw starts spinning the drive
screw will be pushed up and the bearing on which it rests at the top of the li
ft
will come
out of the bearing raceway; this can cause damage to the bearing and may cause the belt
to come o
ff
of the main drive pulley in extreme cases.
4.6
Verify Door and Gate Interlocks
Depending on the number of landings you have each door interlock should be checked so
that if the pla
tf
orm is not at the landing loca
ti
on the door or gate will not open.
Addi
ti
onally, for each door or gate you should manually override to keep each one open
in turn and verify that the li
ft
will not operate.
4.7
Verify E-Stop Button Function
Verify that when the E-stop bu
tt
on is pressed then the li
ft
will not operate.
For commercial li
ft
s the alarm bell should also sound.
4.8
Verify Toe Plate Ramp Operation
If your li
ft
has a toe plate ramp you should verify that the ramp deploys properly and
makes full contact with the lower landing. The ac
ti
on should be smooth and consistent
without binding or jerking of the mo
ti
on.When the toeplate ramp is in the up posi
ti
on
both the ramp and the linkage mechanism should resist up to 125lb of force without
deforming.
Warning
For power wheelchairs that can exert loads higher than 125lb of force a toe plate is
insu
ffi
cient safety pro
tectio
n and a carriage gate op
ti
on will also be required. See RAM
product bulle
ti
n.
