AEG PV.500-MH 5.2.5Parameters of Inverter Stack Fan Control, 5.3.1General, IGBT temperature limit

Protect PV.500_MH Operating Instructions

IGBT temperature > limit value

Initialisation

Maximum speed,

minimum time!

Minimum time elapsed

Variable speed

depending on IGBT

temperature

IGBT temperature

<limit value

Fan switched off

Figure 8 Fan control

5.2.5Parameters of Inverter Stack Fan Control

IGBT temperature limit value for switching off the fan:

If the highest IGBT temperature falls below this limit value, the fan is switched off.

IGBT temperature limits and fan speeds, x-y coordinates for determining variable speed:

The variable fan speed is determined by a linear x-y characteristic on the basis of these values.

IGBT temperature limit:

If the IGBT temperature rises above the lower limit value, the fan that was previously switched off is run at maximum speed for the minimum time.

Minimum time, maximum speed:

If the minimum time has elapsed, the fan is controlled variably us- ing the measured IGBT temperature.

5.3Insulation Monitoring and Earthing of PV Cells

5.3.1General

Insulation measurements and tests are carried out with an inte- grated isometer. This unit detects and checks the insulation re- sistance.

The insulation resistance detected is compared with two limit val- ues stored in the isometer. If the insulation resistance is below one of the limit values, the unit generates a signal. If the limit value is below the other limit value, the device generates a second signal. The limit values can be displayed and even modified on the isome- ter.

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