Tweco 252i Fabricator - Manual (Page 83)

PROBLEMS/SERVICE FABRICATOR 252i
Manual 0-5155 5-3 PROBLEMS AND ROUTINE SERVICE
5.02 Routine Service and Calibration Requirements
!
WARNING
There are extremely dangerous voltage and power levels present inside this Inverter Power Source. Do
NOT attempt to open or repair unless you are an accredited Tweco Service Provider. Disconnect the
Welding Power Source from the Mains Supply Voltage before disassembling.
Routine Inspection, Testing & Maintenance
A. Testing Schedule
1. For transportable equipment, at least once every 3 months; and
2. For fixed equipment, at least once every 12 months.
The owners of the equipment shall keep a suitable record of the periodic tests and a system of tagging, includ-
ing the date of the most recent inspection.
A transportable power source is deemed to be any equipment that is not permanently connected and fixed in
the position in which it is operated.
B. Insulation Resistance
Minimum insulation resistance for in-service Tweco Inverter Power Sources shall be measured at a voltage
of 500V between the parts referred to in Table 5-2 below. Power sources that do not meet the insulation re-
sistance requirements set out below shall be withdrawn from service and not returned until repairs have been
performed such that the requirements outlined below are met.
Components to be Tested
Minimum Insulation
Resistance (MΩ)
Input circuit (including any connected control circuits) to welding circuit
(including any connected control circuits)
5
All circuits to exposed conductive parts 2.5
Welding circuit (including any connected control circuits) to any auxiliary
circuit which operates at a voltage exceeding extra low voltage
10
Welding circuit (including any connected control circuits) to any auxiliary
circuit which operates at a voltage not exceeding extra low voltage
1
Separate welding circuit to separate welding circuit 1
Table 5-2: Minimum Insulation Resistance Requirements: Tweco Inverter Power Sources