requiring motors to be stopped (for example, to stand by until new material is
processed), then quickly started without magnetizing them first.
Note:
• Continuous magnetization is only available in DTC motor control mode (see
page 42). 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 196), 21.1 Start mode (page 290), 21.2
Magnetization time (page 291), 21.8 DC current control…21.12 Continuous
magnetization command (page 296), 21.14 Pre-heating input source (page 297) and
21.16 Pre-heating current (page 297).
￭
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 299), 21.38 Motor
temperature estimation time (page 300) and 35.50 Motor ambient
temperature (page 405).
108 Program features
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