Delta RPI M50A_120 - Error messages and trouble shooting; Errors

10. Error messages and trouble shooting
Installation and Operation Manual for RPI M50A
90
10. Error messages and trouble shooting
10.1 Errors
Message Possible cause Solution
AC Freq Low ● Actual utility frequency is under the
UFR (under frequency recognition)
setting.
● Check the utility frequency on solar
inverter terminal.
● Incorrect country or grid setting. ● Check country and grid setting.
● Detection circuit malfunction. ● Check the detection circuit inside
solar inverter.
AC Freq High ● Actual utility frequency is over the
OFR (over frequency recognition)
setting.
● Check the utility frequency on solar
inverter terminal.
● Incorrect country setting. ● Check country setting.
● Detection circuit malfunction. ● Check the detection circuit inside
solar inverter.
AC Volt High ● Actual utility voltage is over the OVR
(over voltage recognition) setting.
● Check the utility voltage on solar
inverter terminal.
● Utility voltage is over the Slow OVR
setting during operation.
● Check the utility voltage on solar
inverter terminal.
● Incorrect country or grid setting. ● Check country and grid setting.
● Detection circuit malfunction. ● Check the detection circuit inside
solar inverter.
AC Volt Low ● Actual utility voltage is under the UVR
(under voltage recognition) setting.
● Check the utility voltage connection to
solar inverter terminal.
● Incorrect country or grid setting. ● Check country and grid setting.
● Wrong connections in AC plug. ● Check the connection in AC plug.
● Detection circuit malfunction. ● Check the detection circuit inside
solar inverter.
Grid Quality ● Non-linear load in grid and near to
inverter.
● Grid connection of inverter needs to
be far away from non-linear load if
necessary.
HW Connect Fail ● Wrong connection in AC plug. ● Check the AC connection.
● Detection circuit malfunction. ● Check the detection circuit inside
solar inverter.
Insulation ● PV array insulation fault. ● Check the insulation of Solar inputs.
● Large PV array capacitance between
Plus to Ground or Minus to Ground or
both.
● Check the capacitance, dry PV panel
if necessary.
● Detection circuit malfunction. ● Check the detection circuit inside
solar inverter.
No Grid ● AC breaker is OFF. ● Switch on AC breaker.
● Disconnect in AC plug. ● Check the connection in AC plug and
make sure it connects to inverter.