[0]
*
No protection Continuously overloaded motor, when no warning or trip of
drive is required.
[1] Thermistor warning Activates a warning when the connected thermistor or KTY-
sensor in the motor reacts in the event of motor over-temper-
ature.
[2] Thermistor trip Stops (trips) frequency converter when connected thermistor in
motor reacts in the event of motor over-temperature.
The thermistor cut-out value must be > 3 kΩ.
Integrate a thermistor (PTC sensor) in the motor for winding
protection.
[3] ETR warning 1
[4] ETR trip 1
[5] ETR warning 2
[6] ETR trip 2
[7] ETR warning 3
[8] ETR trip 3
[9] ETR warning 4
[10] ETR trip 4
Motor protection can be implemented using a range of techniques: PTC or KTY sensor (see also
section
KTY Sensor Connection
) in motor windings; mechanical thermal switch (Klixon type); or
Electronic Thermal Relay (ETR).
Using a digital input and 24 V as power supply:
Example: The frequency converter trips when the motor temperature is too high
Parameter set-up:
Set Par. 1-90
Motor Thermal Protection
to
Thermistor Trip
[2]
Set Par. 1-93
Thermistor Source
to
Digital Input
[6]
FC 300 Programming Guide 2. How to Programme
MG.33.M2.02 - VLT
®
is a registered Danfoss trademark
59
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