Autoquip FREIGHTLIFT FL4M - Manual (Page 13)

13
ELECTRICAL CURRENT SENSOR (ECS) (Reference Figure 40)
The ECS with trip relay is used to prevent overloading of the FREIGHTLIFT by sensing
an increase in the motor amps drawn should the carriage be overloaded or jammed.
The increase of motor amps will kick the relay out and shut off the motor circuit. This
condition will continue until the carriage overload or jam condition is removed/resolved.
CONTROL TRANSFORMER SECONDARY FUSE
This fuse is located in the control enclosure. It is attached to the electrical control
transformer and protects the 115 volt control circuit from damage should a fault occur
which would result in excessive electric current flow. Should the fuse activate (blow) it
will prevent the operation of the FREIGHTLIFT in either direction.
DANGER !
Turn off power! To avoid personal injury or death, be sure the
power is off and is locked out at the primary power disconnect switch per
OSHA Lock-Out, Tag-Out procedures.
SAFETY INTERLOCKS & STATUS SWITCHES – GATES OR DOORS
(where applicable)
There are electro/mechanical devices that prevent operation of the FREIGHTLIFT when
the gates or doors at any floor level are open. They also prevent the gates or doors
from being opened at any level unless the platform carriage is in place at that floor level.
WARNING !
Close all gates when not in use! Never leave the FREIGHTLIFT unattended
with gates left open!
Never run the unit with the gates or doors open! Do not operate unit with
doors open or with the interlocks “defeated” (bypassed)! Serious injury or
death could result.
COUNTERWEIGHT SENSING SWITCH
(Reference Figure 39)
These switches are located on the top of two of the counterweight tubes as redundant
sensing devices in the event the slack chain sensors are not performing as designed
and the lift motor continues to run in an attempt to lower a jammed carriage. If the
counterweights attempt to be pulled from their tubes, these switches will activate and
will cut off electrical power to the motor.
SAFETY FEATURES