Delta RPI M50A_120 User Manual

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.

Delta RPI M50A_120 Specifications

General

Brand	Delta
Model	RPI M50A_120
Category	Inverter
Language	English