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2.2
MACHINE INTERFACE
2.2.1
GENERAL CONSIDERATIONS
The machine-tool must have all its interference generating elements decoupled (relay coils,
contactors, motors, etc).
*
D.C. Relay coils
Diode type 1N4000.
*
A.C. Relay coils
RC connected as close as possible to the coils. Approximate values:
R 220 Ohm/1W
C 0,2 µF/600V
*
A.C. Motors
RC connected between phases. Approximate values:
R 300 Ohms/6W
C 0,47µF/600V
Ground connection.
A proper ground connection in an electrical installation is essential in order to achieve:
*
The protection of people against electrical discharges caused by any malfunction.
*
The protection of electronic equipment against interference generated at the machine
itself or by other electronic equipment near by which could cause erratic malfunctioning
of the equipment.
Thus, all metallic parts must be connected to the same point and this, in turn, to ground. It
is essential to establish one or two main points in the installation where the elements
mentioned above will be connected.
Cables with sufficient section must be used in order to obtain an impedance as low as
possible and an effective interference suppression maintaining all installation components
at the same voltage level with respect to ground.
Page
2
MACHINE AND POWER CONNECTION
Chapter: 2
Section:
MACHINE INTERFACE
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