924 HEIDENHAIN Technical Manual MANUALplus 620
6.16.23 Weakened field operation
General
Information
The parameter object CfgPowerStage is not required for:
Virtual axes (MP_axisMode = Virtual)
Axes that are for display only (MP_axisMode = Display)
Analog axes (MP_axisHw = Analog)
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 the value installed – mode 2 has been entered in
MP_ampVoltProtection, 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, enter not installed – mode 3 in
MP_ampVoltProtection.
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.
Settings in the configuration editor MP number
Axes
ParameterSets
[Key name of the parameter set]
CfgPowerStage
ampVoltProtection 401205
Please note that there are other possible settings for weakened-field
operation with the CC 61xx, see "Peculiarities in weakened-field operation
with CC 61xx and CC 424" on page 862.
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