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PV-ISOTEST
EN - 19
4. Use the arrow keys
or
and select the position “
Lim.
”.
The display shows the screen to the side.
5. Use the arrow keys (
,
) to set the
minimum
limit
threshold for insulation measurement, which can be
selected among the values
0.05, 0.10, 0.23, 0.25, 0.50,
1.00, 50M
.
Please note that IEC/EN62446-1 g
uideline
sets 1M
as the minimum insulation resistance limit
value for systems with rated voltage higher than 120V
M
15/10 – 18:04
( + )
( - )
V t e s t
- - -
- - - V
R i n s
- - -
- - - M
R p
- - -
M
V P N
V P E
V N E
0 V
0 V
0 V
DUAL 1500V 1.00M
MODE Vtest.
Lim.
6. Connect the instrument to the PV string to be tested as shown in Fig. 6.
The test can
also be performed on several strings in parallel with each other. Remember that any
surge arresters connected to the string cables must be disconnected and that it is
advisable to measure upstream of any blocking diodes
Fig. 6: Instrument connection for insulation measurement in DUAL mode
CAUTION
Upon pressing the
GO/STOP
key, different error messages can be displayed
by the instrument (see § 6.2.3) and, therefore, the test cannot be started.
Check and eliminate, if possible, the problem causing the error message
before going on with the test.
7.
Press and hold the GO/STOP key for 2s
in order to
start the test. In case no error conditions occur, the
instrument displays the message “
Measuring…
” as
shown in the screen to the side. In field “Vtest”, the real
test voltage generated by the instrument is shown.
The
duration of the test can be depending on the
presence or absence of parasitic capacities present
M
15/10 – 18:04
( + )
( - )
V t e s t
- - -
- - - V
R i n s
- - -
- - - M
R p
- - -
M
V P N
V P E
V N E
1 4 8 0 V
- 7 5 0 V
7 4 8 V
Measuring…
DUAL 1500V 1.00M
MODE
Vtest. Lim.