Delta RPI-H3 Service Manual download pdf (Page 47)

41

Inconsistent

defective the inverter

A22: Internal

Comm Fault_R

1. Red. CPU is idling

2. The communication

connection is disconnected

1. Check reset and crystal in Red. CPU

2. Check the connection between Red. CPU

and DSP

A23: Internal

Comm Fault_D

1. DSP is idling

2. The communication

connection is disconnected

3. The communication circuit

malfunction

1. Check reset and crystal in DSP

2. Check the connection between DSP and

COMM

3. Check the communication circuit

A24: Residual

Curr Over

Rating

1. PV array insulation fault

2. Large PV array capacitance

between Plus to Ground or

Minus to Ground

3. Either side of boost driver or

boost choke malfunction

4. Detection circuit malfunction

1. Check the insulation of Solar inputs

2. Check the capacitance (+ <-> GND & -

<-> GND), must < 2.5uF. Install an external

transformer if necessary

3. Check boost driver & boost choke

4. Check the detection circuit inside the

inverter

A25: Ground

Fault

1. PV array insulation fault

2. Large PV array capacitance

between Plus to Ground or

Minus to Ground or both.

3. Detection circuit malfunction

1. Check the insulation of Solar inputs

2. Check the capacitance, dry PV panel if

necessary

3. Check the detection circuit inside the

inverter

A27: RCMU

Circuit Fail

1. RCMU is disconnected

2. Detection circuit malfunction

1. Check the RCMU connection inside the

inverter

2. Check the detection circuit inside the

inverter

A28: Relay

Short

1. One or more relays are

sticking

2. The driver circuit for the

relay malfunction

1. Replace the defective relay(s)

2. Check the driver circuit inside the inverter

A29: Relay

Open

1. One or more relays are

abnormal

2. The driver circuit for the

relay malfunction

3. The detection accuracy is

not correct for Vgrid and Vout

1. Replace the defective relay(s)

2. Check the driver circuit inside the inverter

3. Check the Vgrid and Vout voltage

detection accuracy

A30: Bus

Unbalance

1. Not totally independent or

parallel between inputs

2. PV Array short to Ground

1. Check the inputs connections

2. Check the PV Array insulation

3. Check the driver circuit for boost inside

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