Controls (Thru S/N: 42059) - Unilift 542KB Operator's Manual

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CONTROLS (THRU S/N: 42059)

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 and has four
control toggle switches (see Figure 1-4). 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.
There are four control toggle switches on the Platform Control Station:
a DOWN OVERRIDE-OFF-ON switch,
switches. The DOWN OVERRIDE-OFF-ON switch applies or removes
power to the directional switches. The three directional switches are
oriented so that a movement of a switch results in a corresponding
movement of the bucket. They are spring loaded to the neutral
position.
To operate the machine from the Platform Control Station:
! Hold the DOWN OVERRIDE-OFF-ON switch to the "ON"
position.
! Activate a control switch in the direction of an arrow to move the
platform in the corresponding direction.
! When the control switch is released, it springs back to the neutral
position, and movement stops.
! Movement will also stop when the DOWN
OVERRIDE-OFF-ON switch is released.
The DOWN OVERRIDE position serves as a means of lowering the booms
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 DOWN functions only.
Lower Control Station
The lift may also be operated from the base (see Figure 1-5). The Lower Control Station contains four control switches and a key
switch.
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 UPPER CONTROL-LOWER CONTROL switch must be held in the LOWER CONTROL position before the directional
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!
4520362-1/0302
and three directional
Figure 1-4
Platform Control Station
Courtesy of Crane.Market