Warnings - Delta M70A-260 Installation And Operation Manual

9 Error events and troubleshooting

Warnings

9.2 Warnings
Warning Description
number
W01 DC input voltage is too low.
The inverter is not delivering the expected power. This can
have several causes:
The temperature is too high.
A power limit has been set.
The "Active power control via mains frequency" function is
W07
active and has regulated the active power.
The "Active power control via mains voltage" function is
active and has regulated the active power.
The mains voltage is too low.
The solar voltage is too low or too high.
The polarity of the DC string is reversed.
W08
The string monitoring circuit is defective.
One or more fans are blocked.
One or more fans are defective.
W11
One or more fans are disconnected from the power supply. Check the power supply connections of the fans.
A lightning bolt has struck in the vicinity of the inverter and
the DC surge protection devices have tripped.
One or more DC surge protection devices are defective.
W17
The card containing the DC surge protection devices is not
inserted correctly, fastening screws are missing or the fas-
tening screws are not tightened correctly.
The signal cable is not inserted correctly.
A lightning bolt has struck in the vicinity of the inverter and
the AC surge protection devices have tripped.
One or more AC surge protection devices are defective.
W18
The card containing the DC surge protection devices is not
inserted correctly, fastening screws are missing or the fas-
tening screws are not tightened correctly.
The signal cable is not inserted correctly.
90
Suggestions for resolution
Check the DC input voltage on the inverter display.
There may be insufficient solar radiation.
Check the ambient conditions ( (e.g. air circulation).
Change the power limit settings.
Check the mains frequency.
Check the mains voltage.
Check the mains voltage.
Check the solar voltage.
Connect the DC strings correctly.
Contact Delta Customer Service.
Clean or replace the fans if necessary.
Replace the defective fans.
Check on the inverter whether the DC surge protection
devices have tripped.
If yes, replace the card with the DC surge protection
devices.
Replace the card with the DC surge protection devices.
Check that the card is seated correctly.
Check that there are no missing screws.
Tighten all screws.
Check that the signal cable is inserted correctly.
Check on the inverter whether the DC surge protection
devices have tripped.
If yes, replace the card with the DC surge protection
devices.
Replace the card with the DC surge protection devices.
Check that the card is seated correctly.
Check that there are no missing screws.
Tighten all screws.
Check that the signal cable is inserted correctly.
Installation and operation manual M70A_260 Flex RPI703M26000 EU V1.1 EN 2022-08-02