AB Regin Corrigo E81D-3 Manual
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Contents
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Manual Corrigo Ventilation, revision R Chapter 5 Functional description 395.4 Fan controlGeneralFans can be 1-speed, 2-speed or variable speed via a frequency converter.1-speed fans are controlled using the digital outputs "Start SAF-Normal" and "Start EAF-Normal".2-speed fans are controlled using the digital outputs "Start SAF-Normal" and "Start EAF-Normal"as well as "Start SAF-reduced" and "Start EAF-reduced" giving normal and reduced speedrespectively.Variable speed control uses an analogue output per fan for controlling a frequency converter. Thereare two setpoints for each fan, "Normal" and "Reduced". Pressure or air flow control can be used.Variable speed fans can also be configured to be run with fixed output values.Compensation curveWhen running pressure control, it is also possible to temperature compensate the pressure.Crosswise interlockCrosswise interlock of fans can be configured, which e.g. means that if one fan stops, the other fanwill also stop.Timer outputs, interlock at low outdoor temperaturesThe fans are normally controlled by the timer channels for normal and reduced speed. At very lowoutdoor temperatures, "2-speed fans" or "pressure controlled fans" can be forced to "reduced speed".The limit temperature is settable and the function has a differential of 2K.Normal, reduced speedUnits with 2-speed or pressure control fans are always started at "reduced speed". After a settabletime, Corrigo switches to "Normal speed" if normal speed is valid at start-up. When 2-speed fansare switched from "Reduced speed" to "Normal speed", "Reduced speed" is first disengaged. About2 sec later, "Normal speed" is activated.When Corrigo switches from "Normal speed" to "Reduced speed", there is a settable retardationtime from disengagement to activation. See the section Retardation time.The extract air fan and the supply air fan have individual start and stop delays which are normallyset so that the extract air fan is started before the supply air fan. If there are not enough digitaloutputs for individual control, both fans will have to be started using the signal for the supply airfan, and the delay be created using an external time relay.5.4.1 Pressure controlFrequency control pressureDuring pressure control, two separate analogue output signals are used for supply and extract airand two separate analogue input signals for supply and extract air for pressure transmitters. The fanspeeds are controlled via frequency converters, thereby maintaining constant pressure. The pressuretransmitter inputs are scalable using “Min volt input (Vmin)” and “Max volt input (Vmax)”.A digital activation signal is normally used for each fan ("Start SAF frequency converter" and "StartEAF frequency converter"), for sending a start signal to the frequency converters. The start signal isactivated as long as the fan is expected to be running.For the supply and extract air fans, there are two individually settable setpoint values, onecorresponding to normal speed and one corresponding to reduced speed. Changing between the twosetpoint values is done using the timer channels for normal and reduced speed or using digital inputsignals ("Extended Operation, Normal" and "Extended Operation, Reduced"). |
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