Electrical Connection - Makita GM series Instruction Manual And Safety Instructions

GB

ELECTRICAL CONNECTION

Single-phase compressors are supplied with an electrical cable and a
two-pole + earth plug. The compressor must be connected to a grounded
power socket (fig.12).
Three-phase compressors (L1+L2+L3+PE) must be installed by a
specialised technician. Three-phase compressors are supplied without
a plug. Connect a plug, with screw-on grommet and securing collar
(fig.13), to the cable, consulting the table below.
HP kW Power supply volt/ph Plug model
2 – 3 – 4 1.5 – 2.2 – 3
5.5 – 7.5 – 10 4 – 5.5 – 7.5
NOTE: Compressors installed on the 500 lt tank, with capacity of HP7.5/
55 kW and HP10/7.5 kW can be supplied a star/triangle starting control
unit, whereas the TANDEM (n. 2 pumping elements on the same tank)
are supplied with a timed control unit for staggered starting of the two
pumping elements.
Installation instructions:
– Secure the control unit box on a wall or on a fixed support, and provide
it with a power cable with plug, of a diameter in proportion to its
length.
– Any damage caused by incorrect connections of the power line to
the mains, automatically excludes warranty of electrical parts. To avoid
connection errors, we advise you to contact a specialised technician.
IMPORTANT:
Never use the ground socket instead of the neutral wire. The ground
connection must be made to meet safety standards(EN 60204).
The plug of the power cable must not be used as a switch, but must be
fitted in a power socket controlled by a suitable differential switch (thermal-
breaker).
STARTING
Check that the mains power matches that indicated on the electrical
data-plate (fig.14) – the permissible tolerance range is +/-5%. When
first starting compressors operating on 3-phase voltage, check the
rotation direction of the cooling fan by comparing it with the direction of
the arrow on the belt guard or on the protective housing. In the SILENT
compressor, check if the air flows is in the direction illustrated in fig.21A.
Turn or press into position "0" (according to the type of pressure switch
fitted on the appliance) the knob located on the upper section (fig. 15).
Fit the plug in the power socket (fig. 12 - 13) and start the compressor,
turning the pressure switch knob into position "I". The compressor is
fully automatic, and is controlled by the pressure switch which stops it
when tank pressure reaches maximum value and restarts it when it falls
to minimum value. The pressure difference between maximum and
minimum values is usually about 2 bar (29 psi).
E.g.: the compressor stops when it reaches 8 bar (116 psi – maximum
operating pressure) and restarts automatically when the pressure inside
the tank drops to 6 bar (87 psi).
After connecting the compressor to the power line, load it to maximum
pressure and check exactly how the machine is operating.
COMPRESSORS WITH D STARTING
CONTROL UNIT (fig. 16)
Fit the plug in the power socket (fig. 13) and turn the pressure switch to
position "I" (ON) (fig. 17). Turn the master power switch "A" on the control
unit to position I – power On is signalled by white indicator-light "E"
going on. Turn switch "B" to position 1 to start the compressor. If the
220/380/3
230/400/3 16A 3 pole + ground
220/380/3
230/400/3 32A 3 pole + ground
20
solenoid-valve indicator-light "D" and the motor (C) indicator-light (C) go
on in that order, this means the machine is operating perfectly (fig. 18).
TANDEM COMPRESSORS WITH TIMED
CONTROL UNIT (fig. 17)
Fit the plug in the power socket (fig. 13) and turn the pressure switch to
position "I" (ON). Turn the master power switch "A" on the control unit to
position I – power On is signalled by white indicator-light "E" going on.
Turn switch "B" to start the compressor.
Pos. 1 pumping element n. 1 only is operating
Pos. 2 pumping element n. 2 only is operating
Pos. 3 both pumping elements are operating simultaneously, at staggered
starting times.
The compressor is fully automatic, and is controlled by the pressure
switch which stops it when tank pressure reaches maximum value and
restarts it when it falls to minimum value.
NOTE: The head/cylinder/delivery tube unit can reach
high temperatures. Take care when working near these parts, and do
not touch them to avoid possible burns (fig. 18 - 19).
The electro-compressors must be connected to a power socket protected
by a suitable differential switch (thermal-breaker). The motor of GM-TR
compressors is equipped with an automatic thermal breaker located
inside the winding – this stops the compressor when motor temperature
reaches excessively high values.
If the breaker is tripped, the compressors restarts automatically after
10 to 15 minutes. The motors of compressor models VX are supplied
with a manually resetting automatic amperometric thermal-breaker,
located outside the terminal board cover.
When the breaker is tripped, wait for a few minutes and then reset the
breaker manually (fig. 20).
The motors of the AB series compressors are supplied with a manually
resetting amperometric thermal-breaker, located on the terminal board
cover. When the breaker is tripped, wait for a few minutes and then
reset the breaker manually (fig. 20).
The safety davice is automatic in three-phase and silent compressors.
When the thermal-breaker is tripped, the pressure switch is released to
"0" (OFF) position.
Wait for a few minutes and return the pressure switch to "I" (ON) position
(with the exception of models: AB 100/245-335 Three-phase - AB 150/
245-335 Three-phase - AB 200/245-335 Three-phase). For
compressors supplied with a control unit, the thermal-breaker is installed
inside the control unit. When the thermal-breaker is tripped, observe
the following procedure (fig. 22):
• Turn the switches on the control unit cover to position "0", open the
cover and press push-button 1 of the thermal-breaker. Close the
cover of the control unit and restart the compressor, observing the
operations described in the paragraph "Starting compressors with
control unit".
The same instructions apply to compressors powered at 60 Hz.
ADJUSTING OPERATING PRESSURE (fig. 23)
You do not have to use the maximum operating pressure at all times. On
the contrary, the pneumatic tool being used often requires less pressure.
On compressors supplied with a pressure reducer, operating pressure
must be correctly adjusted.
Release the pressure reducer knob by pulling it up, adjust pressure to
the required value by turning the knob clockwise to increase pressure
and anti-clockwise to reduce it. When you have obtained optimum
pressure, lock the knob by pressing it downward (fig. 23). For pressure
reducers equipped without a pressure gauge, the set pressure can be
seen on the graduated scale located on the reducer body.
IMPORTANT