880 HEIDENHAIN Technical Manual iTNC 530 HSCI
6.8.9 Weakened field operation
General
information
Asynchronous motors are usually operated with a weakened field. This
operating mode can become necessary for synchronous motors if the present
inverter voltage does not suffice for the require rotational speed. Typical
applications for this operating mode are high-speed synchronous spindle
motors and "high-speed" torque motors.
For synchronous drives the operation with a weakened field is automatically
activated if MP2160.x = 1 has been entered, and the desired speed makes it
necessary. Under certain conditions a voltage protection module must be
used.
Because of their design, the HEIDENHAIN EcoDyn motors are treated as a
special case. They must always be operated with a weakened field, but no
voltage protection module is necessary.
For HEIDENHAIN EcoDyn motors, MP2160.x = 2 is to be entered.
The speed-torque characteristics from the drive manufacturer indicate
whether weakened-field operation is necessary. Among other information,
they show the possible speeds in combination with the necessary inverter
voltage.
Please note that there are other possible settings for weakened-field
operation with the CC 61xx, see "Peculiarities in weakened-field operation"
on page 1103.
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