When a cabinet is designed, it must satisfy the environmental conditions
described in Section 3.1. In addition, the magnetic interference on the
CRT screen, noise resistance, and maintenance requirements must be
considered. The cabinet is design must meet the following conditions :
(1)The cabinet must be fully closed.
The cabinet must be designed to prevent the entry of airborne dust,
coolant, and organic solvent.
(2)The cabinet must be designed to maintain a difference in temperature
of 10°C or less between the air in the cabinet and the outside air as the
temperature in the cabinet increases.
See Section 3.4 for the details on thermal design of the cabinet.
(3)A closed cabinet must be equipped with a fan to circulate the air
The fan must be adjusted so that the air moves at 0.5 m/sec along the
surface of each installed unit.
Caution: If the air blows directly from the fan to the unit, dust easily
abheres to the unit. This may cause the unit to fail.
(4)For the air to move easily, a clearance of 100 mm is required between
each unit and the wall of the cabinet.
(5)Packing materials must be used for the cable port and the door in
oreder to seal the cabinet.
Because the CRT unit uses a voltage of approximatery 11 KV to 20
KV, airborne dust gathers easily. If the cabinet is insufficiently sealed,
dust passes through the gap and abheres to the unit. This may cause
the insulation of the unit to deteriorate.
Acceptable packing materials:
Epton sealer No. 686, Nitto Industry Co., Ltd.
Polyurethane foam (ester) covered with vinyl chloride, Fuji
Rubber Co., Ltd.
(6)The CRT/MDI unit must be installed in a location where coolant
cannot be poured directly on it. The unit does have a dust–proof front
The front panel of the CRT/MDI unit is dust–proof. However, we do
not recommend installing the CRT/MDI unit in locations where
coolant directly splashes the front panel. Also, high–voltage is used
in the internal circuits of the CRT/MDI unit. Coolant entering the
CRT/MDI unit might cause serious trouble. The operation pendant
containing the cabinet and CRT/MDI unit is completely sealed, and
designed to prevent dirt, dust and coolant from entering. Pay particular
attention to preventing dust entering the CRT/MDI unit.
(7)Noise must be minimized.
As the machine and the CNC unit are reduced in size, the parts that
generate noise may be placed near noise–sensitive parts in the
The CNC unit is built to protect it from external noise. Cabinet design
to minimize noise generation and to prevent it from being transmitted
to the CNC unit is necessary. See section 3.6 for details of noise
(8)The units must be installed or arranged in the cabinet so that they are
easy to inspect and maintain.
CONDITIONS OF THE