6
Maintenance and care
6/2
6.2.3
Measurement of insulation resistance
Disconnect the machine from the mains. Remove the mains plug!
Open the machine and clean carefully (as described above).
Switch on mains switch.
•
Insulation resistance mains current circuit-casing
Switch on mains switch.
a) Step switch controlled machines:
The machine must be opened. Measure the insulation resistance from the main fuse input and
mains fuse output to the casing. At the mains fuse input it is necessary to measure from each
connection, at the mains fuse output only from one connection.
The resistance must be > 2.5 M
Ω
.
b) Inverter machines:
Measure from one phase of the mains plug to the housing.
The resistance should be > 2.5 M
Ω
.
•
Insulation resistance welding current circuit-casing
Measure between a welding socket and protective conductor.
The resistance should be > 2.5 M
Ω
.
•
Insulation resistance mains current circuit welding-current circuit
Switch on mains switch.
a) Step switch controlled machines:
Measure the insulation resistance between the mains fuse output and a welding current socket.
The resistance must be > 5 M
Ω
.
b) Inverter machines:
Measure between a phase of the mains plug and a welding current socket.
The resistance must be > 5.0 M
Ω
.
6.2.4
Measurement of open circuit voltage
(according to EN 60974-1 / VDE 0544 T1)
-
+
6u8F
10nF
0...5k
Measurement 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 should show 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% and must be no higher
than 113V.
6.2.5
Functional test of the welding machine
Conduct a functional test depending on the type of machine.
6
.
3
Repair work
Repair and maintenance work may only be performed by trained specialist staff.
In all service matters, always consult the dealer who supplied the machine.
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 becomes void.
Summary of Contents for inverter STICK 250 H-2
Page 26: ...10 Schaltpl ne Circuit Diagrams 10 1 10 Schaltpl ne Circuit Diagrams 10 1 STICK 250 H 2...
Page 27: ...10 Schaltpl ne Circuit Diagrams 10 2 10 2 STICK 350 CEL...
Page 28: ...10 Schaltpl ne Circuit Diagrams 10 3 10 3 STICK 350 CEL KLR...
Page 29: ...10 Schaltpl ne Circuit Diagrams 10 4 10 4 STICK 350 CEL PWS...
