Danfoss VLT HVAC Drive FC 100 Series Design Manual page 33

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VLT HVAC Drive Design Guide
In a ventilation system, the temperature is to be maintained at a constant
value. The desired temperature is set between -5 and +35°C using a 0-10
volt potentiometer. Because this is a cooling application, if the tempera-
ture is above the setpoint value, the speed of the fan must be increased
1. Start/Stop via switch connected between terminals 12 (+24 V) and 18.
2. Temperature reference via a potentiometer (-5 to +35°C, 0 10 V)
connected to terminals 50 (+10 V), 53 (input) and 55 (common).
3. Temperature feedback via transmitter (-10-40°C, 4-20 mA) connected
to terminal 54. Switch S202 behind the Local Control Panel set to ON
(current input).
to provide more cooling air flow. The temperature sensor has a range of
-10 to +40°C and uses a two-wire transmitter to provide a 4-20 mA signal.
The output frequency range of the frequency converter is 10 to 50 Hz.
MG.11.B7.02 - VLT ® is a registered Danfoss trademark
2. Introduction to VLT HVAC Drive
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