1-80 Function at Stop
Value:
Coast [0]
DC hold/Preheat [1]
Function:
Select the adjustable frequency drive function
after a stop command or after the speed is
ramped down to the settings in par. 1-81
Min
Speed for Function at Stop [RPM]
.
Select
Coast
[0] to leave the motor in free
mode.
Select
DC hold/Preheat
[1] to energize the
motor with a DC holding current (see par.
2-00).
1-90 Motor Thermal Protection
Option: Function:
The frequency converter determines the motor temperature for
motor protection in two different ways:
• Via a thermistor sensor connected to one of the analog
or digital inputs (par. 1-93
Thermistor Source
).
• Via calculation (ETR = Electronic Thermal Relay) of the
thermal load, based on the actual load and time. The
calculated thermal load is compared with the rated
motor current I
M,N
and the rated motor frequency
f
M,N
. The calculations estimate the need for a lower
load at lower speed due to less cooling from the fan
incorporated in the motor.
[0] No protection If the motor is continuously overloaded and no warning or trip
of frequency converter is wanted.
[1] Thermistor warning Activates a warning when the connected thermistor in the motor
reacts in the event of motor over-temperature.
[2] Thermistor trip Stops (trips) the frequency converter when the connected ther-
mistor in the motor reacts in the event of motor over-tempera-
ture.
The thermistor cut-out value is > 3 k.
6. How to program the adjustable frequency
drive
VLT
®
HVAC Drive Instruction Manual
78
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark
6
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