Danfoss VLT HVAC Series Programming Manual page 53

VLT ® HVAC Drive Programming Guide
NOTE!
Danfoss recommends using 24 V DC as the thermistor supply voltage.
1-91 Motor External Fan
Option:
[0] * No
[1] Yes
1-93 Thermistor Source
Option:
[0] * None
[1] Analog input 53
[2] Analog input 54
[3] Digital input 18
[4] Digital input 19
[5] Digital input 32
[6] Digital input 33
Function:
No external fan is required, i.e. the motor is derated at low speed.
Applies an external motor fan (external ventilation), so that no derating of the motor is required at
low speed. The graph below is followed if the motor current is lower than nominal motor current
Motor Current
(see par.1-24 ). If the motor current exceeds nominal current, the operation time still
decreases as if no fan were installed.
Function:
Select the input to which the thermistor (PTC sensor) should be connected. An analog input option
[1] or [2] cannot be selected if the analog input is already in use as a reference source (selected in
Reference 1 Source
par.3-15 , par.3-16
None
When using MCB112, choice [0]
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
3 Parameter Description
Reference 2 Source Reference 3 Source
or par.3-17
must always be selected.
3
).
3-29