# Modstack (100)

The modstack error is reported by the output stage of the inverter (Modstack) to control board.

The cause of the error can be detailed by the Sub-ID:

### 0 - Error-Sum

All error lines are linked in the modstack via a logical OR to the error sum. The error with Sub-ID 0 must always occur together with this error and another Sub-ID.

If not there is to be expected with either a signal interference or a faulty hardware.

### 1 - Error Phase U

The modstack reports an error in phase U

### 2 - Error Phase V

The modstack reports an error in phase V

### 3 - Error Phase W

The modstack reports an error in phase W

### 4 - Over-Current

The modstack reports an over current error

### 5 - Over-Temperature

The modstack reports an over temperature error

### 6 - DC-Bus Over-Voltage

The modstack reports a dc bus over voltage error

### 7 - Stack 1

The modstack reports an error in stack 1

### 8 - Stack 2

The modstack reports an error in stack 2

### 9 - Stack 3

The modstack reports an error in stack 3

### 10 - Stack 4

The modstack reports an error in stack 4

### 11 - Current Symmetry

The sum of the three phase currents is significantly greater than zero. There are two possible causes:

- There is a ground fault, so that a current is present in the grounding line.

- The current measurement is defective or faulty.

## Fehleraktion

Ein Not-Aus wird durchgeführt.

## Troubleshooting

The error can be acknowledged by an Error-Reset. Depending on the cause of the error (see above) there may be a hardware defect which must be lead to the replacement of the inverter.