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5. Push
to save the results to memory.
A confirmation message with ID number shows on the display and then returns to the test
screen.
Troubleshoot: If the voltage is not within an acceptable range, use the continuous test to
find the diode that fails. See
Blocking Diode Test
Blocking diodes ensure that the electrical current only flows in one direction "OUT" of the
series array to the inverter, external load, controller, or batteries to prevent the current
generated by the other parallel connected PV panels in the same array flowing back through a
weaker (shaded) network and also to prevent the fully charged batteries from discharging or
draining back through the array at night.
Blocking diodes can fail in both open and short circuit states. This test is important for
installations where blocking diodes are fitted.
To set:
1. Turn the rotary switch on the PV Analyzer to
The display shows the default Bypass Diode test mode.
2. Push
for the Blocking Diode test mode.
3. Connect the test leads from the PV Analyzer to the blocking diode.
Tip: Push
to see a connection diagram.
a. Connect green test lead to positive anode.
b. Connect yellow test lead to negative cathode.
Blocking diodes can be measured in operational systems. There is no need to
disconnect the modules or switch off the voltage/power.
4. Use
to set the pass/fail limit for the blocking diode voltage measurement.
To set limit:
a. Use
and
b. Use
to change the value.
c. Push
(Back) to return to the blocking diode test screen.
Continuous Diode
to select the digit to edit.
Test.
.
Note
Multifunction PV Analyzer
Test Setup
35
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