7
Maintenance and care
7/2
7.2.2
Measurement of protective conductor resistance
Measure between safety contact of the mains plug and metal parts which can be touched, e.g.
casing screws. During measuring, the entire length of the machine’s connection lead, especially
near the connection points, must be moved.
The resistance must be < 0.1
Ω
. The measurement must be performed using at least 200 mA.
7.2.3
Measurement of insulation resistance
The machine must be disconnected from the mains.
Open the welding machine and clean carefully
as described in Chap. 7.1. Switch on mains switch.
•
Insulation resistance mains current circuit - casing: Measure from a connection of the mains
plug to the casing. The resistance must be > 2.5 M
Ω
.
•
Insulation resistance welding current circuit - casing: Measure between a welding socket
and protective conductor. The resistance must be > 2.5 M
Ω
.
•
Insulation resistance mains current circuit - welding current circuit: Measure from a
connection of the mains plug to a welding current socket. The resistance must be > 5.0 M
Ω
.
7.2.4
Measurement of open circuit voltage (according to EN 60974-1 /
VDE 0544 T1)
-
+
6u8F
10nF
0...5k
Meqsurement circuit for peak values
Input
0k2
1k0
Diode similar 1N 4007
V
Connect the measuring circuit to the
welding current sockets as shown in Fig. 1.
The voltmeter must indicate the mean
value. Adjust the potentiometer from 0k
Ω
to
5k
Ω
during the measurement.
The measured voltage must not deviate
from that specified on the rating plate (U
0
)
by more than 10%.
7.2.5
Function test of the welding machine
Carry out a function test depending on the type of machine.
7.3
Repair work
Repair and maintenance work may only be performed by specialist staff. In all service matters,
always consult your dealer. Return deliveries of defective equipment subject to warranty may only
be made through your dealer.
When replacing parts, use only original spare parts.
When ordering spare parts, the machine type, serial number and item number of the machine, as
well as the type description and item number of the spare part must be quoted.
If repair or maintenance work is carried out on this machine by personnel who are not trained and
authorised to undertake such work, the right to claim under the warranty lapses.
Содержание inverter TIG 150 DC
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