Thermal Arc 185 AC, Руководство по обслуживанию

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3-4 May 22, 2006
ARCMASTER 185 ACDC 200 ACDC
3.07 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
occur 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 minimize this type of interference.
Looping and suspending of leads should be
avoided where 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.
3.08 Duty Cycle
The duty cycle of a welding power source is the percentage
of a ten (10) minute period that it can be operated at a
given output without causing overheating and damage to
the unit. If the welding amperes decrease, the duty cycle
increases. If the welding amperes are increased beyond
the rated output, the duty cycle will decrease.
!
WARNING
Exceeding the duty cycle ratings will cause the
thermal overload protection circuit to become
energized and shut down the output until the
unit has cooled to normal operating
temperature.
CAUTION
Continually exceeding the duty cycle ratings
can cause damage to the welding power
source and will void the manufactures
warranty.
NOTE
Due to variations that can occur in
manufactured products, claimed performance,
voltages,
ratings, all capacities,
measurements, dimensions and weights
quoted are approximate only. Achievable
capacities and ratings in use and operation will
depend upon correct installation, use,
applications, maintenance and service.