Autoquip FREIGHTLIFT FL4M - Manual (Page 95)

95
PROBLEM POSSIBLE CAUSE AND SOLUTION
Freightlift will not
lower (electrically).
WARNING!
The
lifting chains may be
disconnected and
slack chain sensing
switches missing or
malfunctioning.
Check while standing
near (but NOT on) the
lift carriage and
correct as necessary
– once carriage has
been blocked in place.
WARNING! a safety
device may have been
activated – if you are
not familiar with how
safety devices interact
with the operation of
the lift, you must find
someone who does.
Or, call Autoquip
Customer Service at
888-811-9876.
 A slack chain sensing switch is activated due to a slack or
broken chain condition, or the sensing switch is
malfunctioning or is out of tolerance. Check and/or re-
establish chain tension, or check & repair or adjust sensing
switch(es) as required per “Installation” section.
 The Electric Current Sensor (ECS) has tripped due to an
excessive or jammed load on the carriage. Reduce load to
within rated capacity, or follow procedure to free the
jammed load (See “Installation” section for procedure)
 The counterweight sensing switch, over-travel switch, or
other safety status switches/sensors may have been
tripped. Investigate cause and eliminate the condition
which has caused them to trip.

The level limit switch tripped or is malfunctioning,
preventing the “UP” command. Check with the lift at a
lower level on stops.
 The emergency stop button may be depressed or jammed.
Check all pushbutton stations. Repair as necessary.
 The main disconnect switch / distribution panel circuit
breaker is tripped or a fuse is blown. Check and reset or
replace as necessary.
 A door with status switch is open, or switch or interlock is
malfunctioning or is out of tolerance. Close door, or check
and repair or adjust as required.
 The push button / circuit is malfunctioning. Check
components and circuit. Repair or replace.
 The motor starter overloads (MSO) have tripped. Check
and reset. If it trips again, check for cause in the motor
circuit.
 The control transformer fuse is blown. Check and replace.
The Freightlift lowers
too slowly with a load.
 The motor brake may be malfunctioning. Check and
repair. (See “Lift Blocking” section for safe removal of
brake)
Freightlift raises, then
lowers back slowly.
 The motor brake is not locking the motor drive. The brake
needs to be adjusted or replaced. Check for brake
material in the brake cover housing. (See “Lift Blocking”
section for safe removal of brake)
The Freightlift does
not raise completely to
the upper level (press
“emergency stop”
button to stop motor.)
 Check the upper limit switch setting to see if the setting is
correct.
 There is some sort of interference with the platform
carriage. Check and correct.
 The load exceeds the capacity of the unit. Lower the unit,
unload, and try again.
TROUBLESHOOTING ANALYSIS