Note:
• Continuous magnetization is only available in DTC motor control mode (see page
26). If parameter 21.12 is on, the motor will be kept magnetized after a ramp stop.
To enable continuous magnetization after a coast stop, the command (21.12) must
be cycled (on, off, on). Furthermore, if the Run enable signal has been off, a new
rising edge is required before continuous magnetization starts.
• Continuous magnetization should not be enabled while the motor is rotating.
WARNING!
The motor must be designed to absorb or dissipate the thermal energy generated
by continuous magnetization, for example by forced ventilation.
Settings and diagnostics
Parameters: 6.21 Drive status word 3 (page 159), 21.1 Start mode (page 251), 21.2
Magnetization time (page 252), 21.8 DC current control…21.12 Continuous magnetization
command (page 257), 21.14 Pre-heating input source (page 258) and 21.16 Pre-heating
current (page 258).
￭ Motor temperature estimation
The Motor temperature estimation function identifies the stator resistance and estimates
the initial temperature of the motor. The estimated temperature of the motor can be
used when the ambient temperature drops below zero celsius.
The temperature is estimated by feeding a DC current (25% of the motor nominal current)
into the motor for a time period of 4 seconds (default). The function uses the resistance
value at room temperature obtained during an ID run. For better results, set correct
temperature value in parameter 35.50 during ID run.
The function can be activated with parameter 21.37. The estimation time can be defined
with parameter 21.38. The function can be activated using either of the two ways: With
Drive start command or at Drive power-up (after control board boot).
Settings and diagnostics
Parameters: 21.37 Motor temperature estimation (page 260), 21.38 Motor temperature
estimation time (page 261) and 35.50 Motor ambient temperature (page 360).
￭ Hexagonal motor flux pattern
Note: This feature is only available in scalar motor control mode (see page 26).
Typically, the drive controls the motor flux so that the rotating flux vector follows a circular
pattern. This is ideal for most applications. However, when operating above the field
weakening point (FWP), it is not possible to reach 100% of the output voltage. This
reduces the peak load capacity of the drive.
70 Program features
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