Danfoss VLT AutomationDrive FC 300 Instruction Manual page 54

4 How to Program
1-03 Torque Characteristics
Option:
[0] * Constant torque
[1] Variable torque
[2] Auto Energy Optim.
4
[5] Constant Power
This parameter cannot be adjusted while the motor is running.
1-04 Overload Mode
Option:
[0] * High torque
[1] Normal torque
This parameter cannot be adjusted while the motor is running.
1-90 Motor Thermal Protection
Option:
[0] * No protection
[1] Thermistor warning
[2] Thermistor trip
[3] ETR warning 1
[4] ETR trip 1
[5] ETR warning 2
4-8
Function:
Select the torque characteristic required.
VT and AEO are both energy saving operations.
Motor shaft output provides constant torque under variable speed control.
Motor shaft output provides variable torque under variable speed control. Set the variable torque
VT Level
level in par. 14-40 .
Automatically optimizes energy consumption by minimizing magnetization and frequency via
par. 14-41 AEO Minimum Magnetization
The function provide a constant power in field weakening area. Follows the formula:
Torque x RPM
P constant
=
9550
This selection maybe unavailable depending on drive configuration.
Function:
Allows up to 160% over torque.
For an oversized motor - allows up to 110% over torque.
Function:
The adjustable frequency drive determines the motor temperature for motor protection in three
different ways:
• Via a thermistor sensor connected to one of the analog or digital inputs (par. 1-93
mistor Source ). See section
• Via a KTY sensor connected to an analog input (par. 1-96
section KTY Sensor Connection
• Via calculation (ETR = Electronic Terminal Relay) of the thermal load, based on the actual
load and time. The calculated thermal load is compared with the rated motor current
I and the rated motor frequency f
M,N
load at lower speed due to less cooling from the fan incorporated in the motor.
Continuously overloaded motor, when no warning or trip of the adjustable frequency drive is re-
quired.
Activates a warning when the connected thermistor or KTY sensor in the motor reacts in the event
of motor overtemperature.
Stops (trips) adjustable frequency drive when connected thermistor or KTY sensor in the motor
reacts in the event of motor overtemperature.
The thermistor cut-out value must be > 3 kΩ.
Integrate a thermistor (PTC sensor) in the motor for winding protection.
Please see detailed description below
®
MG.33.AG.22 - VLT is a registered Danfoss trademark
VLT ® AutomationDrive FC 300 Instruction
and par. 14-42 Minimum AEO Frequency
PTC Thermistor Connection .
KTY Thermistor Resource
.
. The calculations estimate the need for a lower
M,N
Manual
.
Ther-
). See