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14.3
Explanation
Manual testing according to
VDE 0544-4
is used for tests of power
sources for arc welding after repair or modification and for periodic
testing.
Periodic testing may only be carried out after possible faults have
been eliminated.
Chapter 14.4 provides a general description of how power sources
for arc welding can be tested individually.
Depending on the protection class of the test sample, the
ST 760
offers preconfigured individual tests.
Specification, selection and order of the individual tests
are determined by the responsible qualified electrician.
Applicable regulations can be found in the current
VDE/ IEC standard and the existing manufacturer
specifications of the test sample.
14.4
General test procedure
Start
In the “
Main menu
”, use the icon on the left to
navigate to the "
VDE 0544-4
” screen.
In the “
Test: VDE 0544-4 / EN 60974-4
" screen, the
corresponding protection class of the test sample must be
selected.
Select the corresponding protection class of the
test sample:
o
Devices with protective conductor (PE)
Protection class I (
Class I
)
o
Devices without protective conductor (PE)
Protection class II (
Class II
)
The
“
VDE 0544-4 / EN 60974-4
” screen opens.
(Example: screen for test samples according to
Class I
)
Visual inspection
Touch the right of the "
Visual
inspection
" line to view the options
for selection.
Select one of the following options:
o
standard visual inspection
o
advanced visual inspection
o
customer-specific visual inspection
Carry out the visual inspection.
14.4.2.1 No defects detected
Standard visual inspection
Confirm
your entries by tapping the “
OK
” button.
Advanced and customer-specific visual
inspection
Confirm by tapping one of the following buttons:
“
Start visual inspection
”
“
All OK
”
“
Start
”
You can continue to test the test sample.
14.4.2.2 Defects detected
Standard visual inspection
Tap the
“
Error
” button.
Advanced and customer-specific visual
inspection
Tap the
“
F
” button
for each test question with a negative result or
“N.A.” for not available.
Tap the “
Start
” button.
You can continue to test the test sample.
Please have a look at the defects detected during the visual
inspection!
The test sample must not be electrically tested if serious
defects have been detected during the visual inspection
which might involve any danger to persons.
14.4.2.3 Disabling a test question
Advanced and customer-specific visual inspection
Before starting the visual inspection, you can use
the
ON/OFF sliders
to enable/disable test
questions.
To enable/disable all
ON/OFF sliders
at the same time, you can
use the "
All inactive
" or “
All active
” buttons.
Selecting individual tests
Select an individual test and follow the instructions on the
display.
(Example: screen for test samples according to
Class II
)
"
Limits
" and "
Polarity reversal time
" can be
changed on the screen of each corresponding
individual test.
To do this, tap the “
Limits
” or “
Polarity reversal
time
” button and change the corresponding value
set.
Changed “Limits" as well as the “Polarity reversal
time" remain active only for the duration of the test.
By default, tests in manual mode run without a time limit
(test time = 0 sec.).
The test person must decide on the basis of the current
display values whether the test can be finished or not.
A polarity reversal must be carried out manually using
the "L<->N" or "N<->L
" button if no “Test time" has
been specified for the polarity reversal.
14.4.3.1 Starting an individual test
Tap the "
Start
" button to start the selected
individual test.
14.4.3.2 Stopping an individual test
Tap the "
Stop
" button to stop the current
individual test.
