User Manual
34
Fault
Possible cause
Method of correction
Communication
failure sometimes
Disturbance
to
communication line
Twisted pair shielded cable
shall be used, with shielding
layer grounded.
Refer to
”.
On the monitoring
unit,
indicator
"POWER/PWR" does
not light up.
No 5V output on
switching
power
supply board
Check voltage on monitoring
unit +5V plug, which shall be
about 5V; otherwise switching
power supply board is faulty
and please contact us for
repair.
On the monitoring
unit, indicator
“RUN”
does not flash.
Faulty CPU board
Contact us for replacement of
the monitoring unit
On the monitoring
unit, indicator
“SPD”
lights up.
Failure
of
surge
protection device
Replace
surge
protection
device in time
Current of a branch
apparently smaller or
larger than current of
other branches
Abnormal current
Check size of PV strings of this
branch for consistency.
Check if this branch has
shaded PV string.
Display
of
open
circuit
fault
of
a
branch
No
PV
string
connected
to
this
branch
Set this branch to unconnected
status.
Dropped out cable or
molten fuse
Check
PV
cables
for
disconnection.
Or, replace fuse.
The following figure illustrates terminals and layouts of metering board.
Summary of Contents for PVS-12MH-DB
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