PM 740 T
page 6
of 21
File: PM740T_r3eng - Settembre 2004 - Manuale per: PM 740 T
PM 740
PM 740
PM 740 T
File: PM740T_r3eng - Settembre 2004 - Manuale per: PM 740 T
page 7
of 21
Fuse replacement
To replace the fuses on the rear panel proceed as follow:
- switch-off the main breaker on front panel or wha
tever device is provided to remove main line from the
equipment;
- unscrew the fuseholder cap;
- replace the fuse with a new one with the same
electrical characteristics;
- also inspect the fuseholder: if it’s oxidised or it has
burn marks then replace it;
- install the fuseholder cap and screw tight.
- fuse values are given below in Fuse Specs page 5
Equipment installation
The PM740 cannot operate on a bench: it must be installed into
a proper cabinet such as a commercial 19” standard enclosure.
The equipment is intended for industrial use only, not for
laboratory use, and the user must respect the wiring norms
and prescriptions as described into next paragraph (“Wiring
instruction”).
The equipment must not operate cantilevered, it must be safely
fixed inside a cabinet by means of screws on the front panel
(which is provided with 4 holes) and supported by means of a
proper frame on the bottom for, at least, 3/4 of the total depth.
Usually two “L” shaped supports on each side of the equip-
ment, having a dimension of mm 10(h) x 30(l) x 1.5 (thick) are
suitable for this purpose.
The rear side of the equipment must be protected by a fixed
panel which can be removed only by means of tools or by a
door with security micro-switch: when the door is opened the
micro-switch must shut-off the main line. This safety pre-
cautions must be taken to avoid operation on rear fuses or on
connectors while the unit is still powered.
Special attention must be taken on designing the cooling air
flow whenever several units are stacked in the same cabinet.
Note that each unit has its own fan which supplies approx 150
m³/h: the outlet of the exhaust air is on the back of the equip-
ment.
When designing a cabinet to house several units we recom-
mend that the following design criteria be adopted:
- use a standard 19” wide enclosure with a depth of
800 mm (32”);
- allow free intake of the cooling air from the front of
the cabinet and exhaust air from back;
- in case of ambient air with high degree of dust and
moisture, install a proper air conditioner; if you cannot
do this, then you have to use suitable air filters and
instruct the user about their cleaning;
- provide a separation between the air intake duct and
the air outlets, in order to avoid air-recycling.
Handling instructions
The equipment weight is 20 kg (44 lbs). Always lift from the
bottom and use an adequate rugged support to avoid personal
injury and damage to equipment itself.
In the case of shipping, package with the original package or
use a wooden case and a proper filler: movement of the equip-
ment inside the package must be avoided.
Warning
: use handles only for helping during installation.
Never use handles to lift the rack: the handles will not
withstand the off-center weight of the rack!
To lift always lean the rack over a proper supporting base.
Wiring instructions
The PM740 must be installed and serviced only by qualified
personnel acquainted with the regulations covering the applica-
tion. For safety operations the following rules must be adopted:
I) the equipment must be grounded through connector #1
using pin 4 (see the wiring diagram at page 15);
II) connect the ground screw on panel rear (indicated by
“ground” symbol) directly to the remote microwave generator
head by a separate yellow/green wire gauge 2.5 mm²;
III) the main supply, 3 x400V must be provided through con-
nector #1: connect phases according to schematic at page 15.
2,5 mm² wire must be used with this connector.
IV) The magnetron head unit must be connected to the main
unit by connector #2. 1.5 mm² wire must be used with this
connector. Refer to wiring diagram on page 16;