Figure 3-3 Detect optimizer disconnection
3.3 Rapid Shutdown
When the output is disconnected or the inverter shuts down, the optimizer can
adjust the module output voltage to a safe range to ensure the safety of the
construction and O&M personnel as well as
reghters.
If optimizers are congured for all PV modules, the PV system can perform a rapid
shutdown to decrease the output voltage to below 120 V within 15s and to below
30 V within 30s.
Perform the following steps to trigger a rapid shutdown:
● Method 1: Turn
o the AC switch between the inverter and the power grid.
● Method 2: Turn
o the DC switch on the inverter.
● Method 3: Connect a switch to the DI and GND ports of the inverter to form a
circuit. (For details about the DI port, see the corresponding inverter user
manual.) The switch is turned on by default. Turn
o the switch to trigger a
rapid shutdown.
3.4 Troubleshooting
Table 3-1 Common alarms and troubleshooting measures
Alarm Name
Cause Suggestions
Input
overvoltage
Optimizer input
overvoltage
occurred.
Check whether the open-circuit voltage of
the PV module exceeds the maximum input
voltage of the optimizer.
MERC Smart PV Optimizer
User Manual 3 System Maintenance
Issue 02 (2022-09-20) Copyright © Huawei Digital Power Technologies Co., Ltd. 12
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