Fronius TP 1500, Руководство по обслуживанию

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44
- Shift the mains switch to “O” and
unplug the machine from the mains
Checking the
transistor
module
Fig.11 Transistor module with diode paths
0.2 - 0.7 V
0.4 - 1 V
(6)
(5)
0.2 - 0.7 V
(7)
0.2 - 0.7 V
0.2 - 0.7 V
0.2 - 0.7 V
0.2 - 0.7 V
(1)
(2)
(4)
(3)
Warning! An electric shock can
be fatal. Before beginning with
the test procedure, discharge all
the electrolytic capacitors.
- Open the housing (see section headed
“Opening the housing”)
- Measure the diode paths in the
conducting direction, as shown in the
illustration, with a diode testing device
(e.g. multimeter with diode testing
function)
- Measure the diode paths in the non-
conducting direction as well
- Replace the transistor module if the
measurements in the conducting
direction show that:
- the measured voltage drop is
significantly outside the specified
tolerance ranges, or if:
- a short-circuit or high-resistance
continuity is measured
- Also replace the transistor module if a
short-circuit or high-resistance
continuity is measured in the non-
conducting direction
The illustration (Fig.11) shows the diode
paths of the transistor module and the
respective diode voltages.