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Protect PV.500 Operating Instructions
32 of 70 80000031354 BAL
5.2.3 Cabinet Fan Control Parameters
Unit exhaust air temperature limit value for switching on the
fan:
If the highest exhaust air temperature rises above this limit value,
the fans which were switched off are switched to the fast fan stage.
Unit exhaust air temperature limit value for switching off the
fan:
If the highest exhaust air temperature falls below this limit value,
the fans which were running in the slow fan stage are switched off.
Unit exhaust air temperature limit value for switching to the
fast fan stage:
If the highest exhaust air temperature rises above this limit value,
the fans which were running in the slow fan stage are switched to
the fast fan stage.
Unit exhaust air temperature limit value for switching to the
slow fan stage,
minimum time in the fast fan stage:
If the highest exhaust air temperature falls below this limit value,
the fans which were running in the fast fan stage are switched to
the slow fan stage if the minimum time in the fast fan stage has
elapsed.
5.2.4 Fan Control, INV Stack Fan
As soon as the equipment's control module is supplied with
voltage, fan control always starts with the maximum fan speed.
This means that the control can be restarted to check whether the
fan is working correctly. For example, after maintenance work, it is
not necessary to wait for the fan to reach the temperature criterion
to switch on the maximum fan speed.
The maximum fan speed is always active for at least a certain
time. The IGBT temperatures are checked after this time. The fan
speed is then determined using the highest of these temperatures.
If the highest temperature from the two sensors is below a certain
value, the fan is switched off completely.
If the highest temperature from the two sensors rises above a
certain value with the fans switched off, the fan is again operated
at the maximum speed for a certain time.
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