ESAB ET 220i AC/DC, Руководство по эксплуатации

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ET 220I AC/DC
INSTALLATION, OPERATION AND SETUP Manual 0-5346
3-2
NOTE!
This unit is equipped with a three-conduc-
tor with earth power cable that is con-
nected at the welding power source end for
single or three-phase electrical input power.
Do not connect an input (WHITE, BLACK or RED) conductor to the
ground terminal.
Do not connect the ground (GREEN) conductor to an input line
terminal.
Refer to Figure 3-1 and:
1. Connect end of ground (GREEN) conductor to a suitable
ground. Use a grounding method that complies with all
applicable electrical codes.
2. For 3- phase operation, connect ends of line 1 (BLACK)
and line 2 (WHITE) and line 3 (RED) input conductors to
a de-energized line disconnect switch.
For 1- phase operation, connect BLACK and WHITE input
conductors. Insulate the RED Conductor.
3. Use Table 3-1 as a guide to select line fuses for the
disconnect switch.
Fuse Size
Input Voltage 1 Phase 3 Phase
208 VAC 100 Amps 60 Amps
230 VAC 80 Amps 50 Amps
460 VAC 50 Amps 30 Amps
Table 3-1 Electrical Input Connections
NOTE!
Fuse size is based on not more than 200
percent of the rated input amperage of the
welding power source (Based on Article
630, National Electrical Code).
Welding Power Source
Ground Terminal
Ground Conductor
Line Disconnect Switch
Line Fuse
Primary Power Cable
Art # A-12451
Figure 3-1 Electrical Input Connections
Input Power
Each unit incorporates an INRUSH circuit and input voltage
sensing circuit. When the MAIN SWITCH is turned ON, the inrush
circuit provides a pre-charging of the input capacitors. A relay in
the Main Power PCB2 will turn on after the input capacitors have
charged to operating voltage (after approximately 5 seconds).
NOTE!
Note the available input power. Damage to
the PCB could occur if 575VAC or higher is
applied.
3.05 High Frequency Introduction
The importance of correct installation of high frequency welding
equipment cannot be overemphasized. Interference due to high
frequency initiated or stabilized arc is almost invariably traced to
improper installation. The following information is intended as a
guide for personnel installing high frequency welding machines.
!
WARNING EXPLOSIVES
The high frequency section of this machine
has an output similar to a radio transmitter.
The machine should NOT be used in the
vicinity of blasting operations due to the
danger of premature firing.
!
WARNING COMPUTER
It is also possible that operation close to
computer installations may cause com-
puter malfunction.
3.06 High Frequency Interference
Interference may be transmitted by a high frequency initiated or
stabilized arc welding machine in the following ways.
1.
Direct Radiation:
Radiation from the machine can oc-
cur if the case is metal and is not properly grounded. It can occur
through apertures such as open access panels. The shielding of
the high frequency unit in the Power Source will prevent direct
radiation if the equipment is properly grounded.
2.
Transmission via the Supply Lead:
Without adequate
shielding and filtering, high frequency energy may be fed to the
wiring within the installation (mains) by direct coupling. The
energy is then transmitted by both radiation and conduction.
Adequate shielding and filtering is provided in the Power Source.
3.
Radiation from Welding Leads:
Radiated interference
from welding leads, although pronounced in the vicinity of the
leads, diminishes rapidly with distance. Keeping leads as short
as possible will minimise this type of interference. Looping and
suspending of leads should be avoided wherever possible.
4.
Re-Radiation from Unearthed Metallic Objects:
A
major factor contributing to interference is re-radiation from
unearthed metallic objects close to the welding leads. Effective
grounding of such objects will prevent re-radiation in most cases.