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Protect PV.500 Operating Instructions
80000031354 BAL 33 of 70
Variable speed
depending on IGBT
temperature
Fan switched off
Initialisation
Maximum speed,
minimum time!
IGBT temperature
< limit value
IGBT temperature
> limit value
Minimum time elapsed
Figure 8 Fan control
5.2.5 Parameters of INV 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
using the measured IGBT temperature.
5.3 Insulation Monitoring and Earthing of PV Cells
5.3.1 General
Insulation measurements and tests are carried out with an
integrated "Bender A-ISOMETER IRDH275B". This device detects
and checks the insulation resistance.
The insulation resistance detected is compared with two limit
values 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 unit generates a second signal.
The limit values can be displayed and even modified on the
isometer.
The insulation resistance detected and the two signals are sent to
the equipment control. The insulation resistance is displayed as a
measured value. Signalling faults are generated from the two
isometer signals (Æ chapter 6).
37


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