Tweco 6000GST Merlin Plasma Cutting CE Slave Power Supply - Manual (Page 22)

INSTALLATION PROCEDURES 3-4 Manual 0-2653
Input Power
Filter PC Board
and Bracket
Primary Power
Cable
Strain Relief
Fitting
Input Ground
Connection
A-00896
L1
L2
L3
Figure 3-5 Input Voltage Connections
2. Locate the four input connectors, flat washers, conical
spring washers, and hex locking nuts supplied with the
power supply.
3. Install the input connectors, supplied, onto each of the
input power line leads of the power cable.
Input
Connector
Input Power Cable
(One Line)
Slotted Screw
A-00908
PC Board
Power Stud
Flat Washer
Conical Spring
Washer
Hex Locking
Nut
Figure 3-6 Input Voltage Connector Installation Detail
4. Connect the input power connectors to the EMI Input
Power Filter PC Board input studs with the supplied
hex locking nuts, conical spring washers, and flat wash-
ers as follows:
• Input ground wire to G1.
• LI input line to X1.
• L2 input line to Y1.
• L3 input line to Z1.
5. Tighten the nuts being careful not to over-tighten. Refer
to the following WARNING.
WARNING
Do Not over tighten the nuts securing the iput
power cable connectors as damage to the PC Board
can occur.
3.08 Ground Connections For
Mechanized Applications
NOTE
Refer to Appendix 3 for a block diagram of a typi-
cal mechanized system work and ground cable con-
nections.
A. Electromagnetic Interference (EMI)
Pilot arc initiation generates a certain amount of electro-
magnetic interference (EMI), commonly called RF noise.
This RF noise may interfere with other electronic equip-
ment such as CNC controllers, remote controls, height
controllers, etc. To minimize RF interference, follow these
grounding procedures when installing mechanized sys-
tems:
B. Grounding
1. The preferred grounding arrangement is a single point
or “Star” ground. The single point, usually on the
cutting table, is connected with 1/0 AWG (50.0 mm
2
European) or larger wire to a good earth ground (re-
fer to paragraph ‘C’, Creating An Earth Ground). The
ground rod must be placed as close as possible to the
cutting table, ideally less than 10 ft (3.0 m), but no
more than 20 ft (6.1 m).
NOTE
All ground wires should be as short as possible.
Long wires will have increased resistance to RF
frequencies. Smaller diameter wire has increased
resistance to RF frequencies, so using a larger di-
ameter wire is better.