Scope Of The Test; Visual Inspection; Measuring The Open Circuit Voltage; Measurement Of Insulation Resistance - EWM TETRIX 1002 DC SYNERGIC Operating Instructions Manual

Maintenance and testing
Test
7.3.2

Scope of the test

a) Visual inspection
b) Electrical test: measurement of
• open circuit voltage
• insulation resistance, or alternatively
• leakage currents
• protective conductor resistance
c) Functional test
d) Documentation
7.3.3

Visual inspection

The key areas in the test are:
1. Torch/stick electrode holder, welding current return lead clamp
2. Power supply: leads including plugs and strain relief
3. Welding current circuit: leads, plugs and couplings, strain relief
4. Casing
5. Operating, message, safety and adjustment devices
6. Other, general condition
7.3.4

Measuring the open circuit voltage

1k0
0k2
0...5k
Measuring circuit according to DIN EN
7.3.5

Measurement of insulation resistance

The mains switch must be on so that the insulation in the interior of the machine can also be checked
through to the transformer. If a mains contactor is fitted, this should be bridged or the measurement must
be carried out on both sides.
The insulation resistance must not be less than:
Mains current circuit
Welding current circuit and
electronics
Mains current circuit
58
1N 4007
6u8F
10nF
60974-1
against Welding current circuit and electronics 5 MΩ
against Protective conductor circuit (PE)
against Protective conductor circuit (PE)
Connect the measuring circuit to the welding current
sockets. The voltmeter must display mean values and
have an internal resistance ≥ 1 MΩ. In the case of step
switch controlled devices, set the maximum output voltage
(step switch). Adjust the potentiometer from 0 kΩ to 5 kΩ
during the measurement. The measured voltage should
not deviate from that specified on the rating plate by more
than +/- 5% and may be no greater than 113 V (for devices
with VRD: 35 V).
2.5 MΩ
2.5 MΩ
Item No.: 099-000155-EWM01