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SMFT-1000
Users Manual
28
Insulation Resistance Test (R
INS
)
The R
INS
Mode is a test for the resistance of the insulation between the ground and the PV
Array as required by IEC 62446-1 Clause 6.7. Repeat this test, as a minimum, for each PV array
or sub-array. You can also test individual strings if required.
Test Method 1 (Keep the Leads)
This test is between the PV Array negative and earth followed by a test between the PV Array
positive and earth. For this test, the connections do not change (Keep the Leads option).
To t es t:
1. Turn the rotary switch on the PV Analyzer to R
INS
.
2. Connect the test leads to the solar panel.
Tip: Push
to see a connection diagram.
If ground-point and frames are bonded to earth point on site:
a. Connect the green test lead to ground.
b. Connect the red test lead to positive terminal on the PV Array.
c. Connect the blue test lead to negative terminal on the PV Array.
OR
If ground-point and frames are not bonded to earth point on site (protection class II of
installation):
a. Connect the green test lead to PV Array frame.
b. Connect the red test lead to positive terminal on the PV Array.
c. Connect the blue test lead to negative terminal on the PV Array.
3. Use the
to select the nominal test voltage (V
N
selection=50/100/250/500/1000 V).
This value will trigger the limit values.
4. After leads are configured, push
>1 s. to start the R
INS
(1) measurement.
The dashes blink during the measurement calculation and then the test results show on the
display:
R
INS
: lowest number of R
INS
+ or R
INS
-
R
INS
+: insulation resistance PV+ to ground
R
INS
-: insulation resistance PV- to ground
V
INS
+: applied test voltage during the insulation test (PV+ to ground)
V
INS
-: applied test voltage during the insulation test (PV- to ground)
1.888.610.7664 sales@GlobalTestSupply.com
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