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Installation manual
CNC 8055
CNC 8055i
5.
MACHINE AND POWER CONNECTION
SOFT: V02.2X
The supply current has the following shape on power-up:
Machine connection
The machine-tool must have all the interference generating elements (relay coils, contactors,
motors, etc.) uncoupled.
• DC relay coils.
Diode type 1N4000.
• AC relay coils.
RC connected as close as possible to the coils. Their approximate values should be:
• AC motors.
RC connected between phases with values:
Ground connection
Proper ground connection in the electrical installation is crucial for:
• Protecting people against electrical discharges due to any malfunction.
• Protecting the electronic equipment against disturbances generated at the machine itself and
at the electronic equipment nearby that may cause an anomalous performance of the unit.
Thus, it is essential to connect all metallic parts to a point and it to ground in order to achieve this.
Therefore, it is crucial to install one or two ground points where the above mentioned elements must
be connected.
Use large section cables for this purpose in order to obtain low impedance and efficiently avoid any
interference. This way all parts of the installation will have the same voltage reference.
Proper ground installation reduces the effects of electrical interference. But, signal cables also
require additional protections. This is generally achieved by using twisted-pair cables that are also
covered with antistatic shielding mesh-wire. This shield must be connected to a specific point
avoiding ground loops that could cause undesired effects. This connection is usually done at one
of CNC’s ground point.
Each element of the machine-tool/CNC interface must be connected to ground via the established
main points. These points will be conveniently set close to the machine-tool and properly connected
to the general ground (of the building).
When a second point is necessary, it is recommended to join both points with a cable whose section
is no smaller than 8 mm
2
.
Verify that the impedance between the central point of each connector housing and the main ground
point is less than 1 .
R 220 1 W C 0.2 µF / 600 V
R 300 / 6 W C 0.47 µF / 600 V
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