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5.2.3Cabinet 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.
5.2.4Fan Control, Inverter Stack Fan
As soon as the equipment's control module is supplied with volt- age, 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, when the fans are switched off, the highest temperature from the two sensors rises above a certain value, the fan is again oper- ated at the maximum speed for a certain time.
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