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 design must meet the following conditions :
D The cabinet must be fully closed.
The cabinet must be designed to prevent the entry of airborne
dust,coolant,and organic solvent.
Cabinets that let in air may be designed for the servo amplifier and
servo transformer provided that they :
- Use an air filter on the air inlet ;
- Place the ventilating fan so that it does not blow air directly toward
- Control the air flow so that no dust or coolant enters the air outlet
D 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 when
the temperature in the cabinet increases.
See Section 3.5 for the details on thermal design of the cabinet.
D 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 adheres to the unit. This may cause the unit to fail.
D For the air to move easily, a clearance of 100 mm is required between
each unit and the wall of the cabinet.
D Packing materials must be used for the cable port and the door in order
to seal the cabinet.
Because the CRT unit uses a voltage of approximately 11 kV, airborne
dust gathers easily. If the cabinet is insufficiently sealed, dust passes
through the gap and adheres to the unit. This may cause the insulation
of the unit to deteriorate.
D 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
D 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 3.7 for details of noise
D The units must be installed or arranged in the cabinet so that they are
easy to inspect and maintain.
CONDITIONS OF THE