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,
The variable fan speed is determined by a linear
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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