Operation; Control Circuit Components - nifty 170H Series Operating And Safety Instructions Manual

TM Series
Operating & Safety Instructions
4

Operation

4.1

CONTROL CIRCUIT COMPONENTS

4.1.1
CONTROL BOARD: - Situated under the canopy, the control board comprises a PCB (printed circuit
board) design that incorporates all of the relays to control the machine operation. The control board is
common between models with the same power source, and will contain, where appropriate, discrete
fuses for the circuits concerned.
4.1.2
KLAXON: - Also mounted under the canopy is a klaxon, which is interlocked into the stabiliser control
circuit. It is this device that sounds continuously if a jack goes light in operation, with the booms
raised, warning the operator of this condition. It will also sound if the Ground Control Key switch is
turned to Platform position before the jacks are deployed.
4.1.3
BOOM-SWITCH (170H ONLY): - Mounted on the side of Boom 1 near the boom rest and operated by
contact with boom 3, this switch controls the changeover function between jacks and platform. The
jack control function is not available unless this switch is engaged with the boom, ensuring that the
machine must be stowed to operate the hydraulic jacks. It is also similarly linked into the platform
control circuit, such that if the switch is not engaged with the booms, (i.e. machine is in operation)
then the outrigger sensors are active and would warn the operator of an unsafe condition, should one
of them loose contact with the ground. These control functions are of primary importance to safety of
the machine and operator. Under no circumstances should this control function be isolated or by-
passed.
4.1.4
BATTERY ISOLATOR: - A grey battery isolator handle is located beneath the canopy which allows the
machine control and power circuits to be isolated from the batteries themselves. Under normal
operation, the machine Key switch should be used to isolate the machine with the Battery Isolator only
being required to disconnect the batteries for maintenance or in the event of a short circuit. The battery
charging circuit is connected directly to the battery side, so charging is un-affected by use of this
switch.
4.1.5
POWER SOURCE SELECTION (170H ONLY):- On multiple power option machines, the machine is
fitted with an 'instinctive' circuit for power source selection. Pressing the green button will
automatically select battery operation. The engine can be started using the two position START/STOP
selector in the platform and the machine will 'default' to engine operation via a flow switch in the
hydraulic circuit. Stopping the engine by selecting STOP on the two position selector in the platform
and pressing the green button will return the machine to battery mode.
4.1.6
DIESEL ENGINE: - Generally a Yanmar L40 or Kubota 0C60 engine, described in the maintenance
section of the Workshop Manual, driving a single bodied pump with direct mounted pump dump valve.
4.1.7
PETROL ENGINE: - Generally a Honda GX 160 engine, described in the maintenance section of the
Workshop Manual, driving a single body pump with direct mounted pump dump valve.
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English/USA – 01/10