Tweco 170Pi Transtig - Manual (Page 59)

TRANSTIG 170Pi
Manual 0-5241 5-3 POWER SOURCE PROBLEMS AND ROUTINE SERVICE REQUIREMENTS
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: Cigweld Inverter Power Sources
C. Earthing
The resistance shall not exceed 1Ω between any metal of a power source where such metal is required
to be earthed, and -
1. The earth terminal of a fixed power source; or
2. The earth terminal of the associated plug of a transportable power source
Note that due to the dangers of stray output currents damaging fixed wiring, the integrity of fixed wiring
supplying Cigweld welding power sources should be inspected by a licensed electrical worker in accordance
with the requirements below -
1. For outlets/wiring and associated accessories supplying transportable equipment - at least once
every 3 months; and
2. For outlets/wiring and associated accessories supplying fixed equipment - at least once every 12
months.
D. Voltage Reduction Device (VRD)
Units fitted with VRD's, shall have the periodic tests outlined in Table 6-2 below conducted by an accredited
CIGWELD service provider. Testing shall be conducted at intervals as outlined below -
1. For transportable equipment, at least once every 3 months; and
2. For fixed equipment, at least once every 12 months.
Description Required Parameters
VRD Open Circuit Voltage Less than 35V; at nominal input voltage
VRD Turn OFF Resistance
Less than 200 ohms
VRD Turn ON Time Less than 0.3 seconds
Table 5-3: VRD Periodic Tests
E. General Maintenance Checks
Welding equipment should be regularly checked by an accredited Cigweld Service Provider to ensure
that:
1. Flexible cord is of the multi-core tough rubber or plastic sheathed type of adequate rating, correctly
connected and in good condition.
2. Welding terminals are in suitable condition and are shrouded to prevent inadvertent contact or short
circuit.
3. The Welding System is clean internally, especially from metal filing, slag, and loose material.