Controls (S/N: 42060 & Above) - Unilift 542KB Operator's Manual

Page 1 - 5A - Operation
CONTROLS (S/N: 42060 & Above)
Movement of the lift may be controlled from the Platform Control Station (bucket) or the Lower Control Station (base).
Platform Control Station
The Platform Control Station is attached to the bucket (see Figure 1-4A) and contains five toggle switches and a power indicator
lamp. The Platform Control Station is used to control movement of the machine from the bucket.
IMPORTANT: The 542 KB is equipped with a control system timer.
Anytime the key switch is activated to the "ON" position, the unit will
require a 5-second time-out before the controls are operable.
The Platform Control Station has five control toggle switches: an
EMERGENCY STOP switch, a DOWN OVERRIDE-OFF-ENABLE
switch, and three directional switches. The EMERGENCY STOP switch
applies or removes power to the Platform Control Station, and must be in
the ENABLE position to operate the machine from the bucket. The
DOWN OVERRIDE-OFF-ENABLE switch applies or removes power to
the directional switches. Activating a switch in a certain direction results
in a corresponding movement of the bucket. The switch actuators are
spring loaded to the neutral position.
To operate the machine from the Platform Control Station:
M Set the EMERGENCY STOP switch to the "ENABLE" position.
The power indicator lamp will light.
M Hold the DOWN OVERRIDE-OFF-ENABLE switch to the
"ENABLE" position.
M Activate a control switch in the chosen direction to move the
bucket/boom in the corresponding direction.
M When the control switch is released, the actuator returns
to the neutral position, and movement stops.
M Movement will also stop when the DOWN OVERRIDE-OFF-ENABLE switch is released.
The DOWN OVERRIDE position serves as a means of lowering the bucket in an emergency situation due to an electrical system
malfunction or interlock concern. Activating the switch to the DOWN OVERRIDE position allows operation of the LOWER
functions only.
Lower Control Station
The lift may also be operated from the base (see Figure 1-5A). The Lower Control Station contains four toggle switches, a key
switch, and an EMERGENCY STOP button.
IMPORTANT: The 542 KB is equipped with a control system timer. Anytime the key switch is activated to the "ON" position,
the unit will require a 5-second time-out before the controls are operable.
The EMERGENCY STOP button must be disengaged and the PLATFORM CONTROL-LOWER CONTROL switch must be
held in the LOWER CONTROL position before the control switches at the base will operate. This prevents accidental activation
of the Lower Control Station.
IMPORTANT: The Lower Control Station is intended for crane operation and stowing of the booms. When a worker is
present in the bucket, the lower controls may be used for an emergency only!
The toggle switches control movement of the booms and rotation system. Activating a switch in a certain direction results in a
corresponding movement of the bucket. The switch actuators are spring loaded to the neutral position.
4520362-1/0302
Figure 1-4A
Platform Control Station
Courtesy of Crane.Market