Replacing An Optimizer - Huawei MERC Smart PV Optimizer User Manual

MERC Smart PV Optimizer
User Manual
Alarm Name
Abnormal output
voltage
Upgrade failed

3.5 Replacing an Optimizer

Prerequisites
●
Issue 05 (2023-03-31)
Cause
The optimizer
output voltage
is abnormal.
The optimizer
software
upgrade failed.
NO TE
If the fault persists after all suggested measures listed above are completed, contact your
installer.
Use dedicated insulation tools, and wear insulation shoes and insulated
gloves before performing operations.
Copyright © Huawei Digital Power Technologies Co., Ltd.
Suggestions
1. When the sunlight is normal, perform
optimizer search again.
2. Check the voltage of the corresponding
PV string. If the voltage is greater than
0 V, power off the system and check
whether the extension cable of the
abnormal optimizer is correctly
connected.
3. Check the voltage of the corresponding
PV string. If the voltage is 0 V, power
off the system and check the cable
connection of the PV string. If there is
an open circuit, rectify the cable
connection of the PV string. If the
polarity is incorrect, reconnect the PV
string in the correct polarity. After the
open circuit or reverse polarity is
rectified, power on the system and
perform an optimizer search again. If
the alarm persists, check whether the
extension cable of the abnormal
optimizer is correctly connected.
4. If the fault persists, contact your
installer.
Note: The polarity at both ends of the
extension cable must be opposite (one
end is a positive connector, and the
other is a negative connector). To
determine the PV string polarity, see ''3
Installing the Optimizer Cables'' in the
optimizer quick guide.
1. When the sunlight is normal, perform
the optimizer upgrade again.
2. If the fault persists, contact your
installer.
3 System Maintenance
24