January 2012 6.16 The Control Loop 927
Mode 1:
Enter MP_ampVoltProtection = not installed – mode 1 if you want to
operate synchronous motors without a weakened field. ((1) in the
commissioning flow chart)
Field weakening for synchronous motors is deactivated, i.e. the field
weakening current is always 0, regardless of the speed and load. Use this
entry also for all asynchronous motors. MP2160 is without effect on them.
Mode 2:
Enter MP_ampVoltProtection = installed – mode 2 if you want to
operate the synchronous motor with a weakened field (check whether a
voltage protection module must be used. ((2) in the commissioning flow
chart).
This entry is intended for synchronous spindles and torque motors in turning
mode. Here, field weakening is active in a wide speed range, i.e. the
maximum speed nmax is much higher than the rated speed nrated (nmax
>> nrated). The internal voltage Uemk at maximum speed in the motor leads
to a considerable rise of the DC-link voltage if the power supply fails, so that
the connected inverters and also the motor can get damaged. It is therefore
necessary to install a voltage protection module (e.g. SM 110, see the
"Inverter Systems and Motors" Technical Manual) as a protective measure.
The EcoDyn synchronous motors from HEIDENHAIN are operated with
limited field weakening. No voltage protection module is necessary here.
Select from the motor table the motors with the designation QSY1xxx EcoDyn
or QSY1xxx EcoDyn EnDat for MP_motName
Enter MP_ampVoltProtection = not installed – mode 3 if you use
HEIDENHAIN EcoDyn synchronous motors. ((3) in the commissioning flow
chart).
This entry is intended for axis motors in EcoDyn operation. Here, field
weakening is only active in a relatively small speed range, i.e. the maximum
speed nmax is not significantly higher than the rated speed nrated (nmax >
nrated). The MANUALplus 620 calculates a voltage-dependent, maximum
speed nmaxUz. This speed ensures that the internal voltage Uemk in the
motor only leads to a limited rise of the DC-link voltage if the power supply
fails. Using a voltage protection module is therefore not necessary. Please
note that the voltage-dependent, maximum speed nmaxUz can be lower
than the maximum speed in the motor table. Please take this into
consideration during project planning.
U0 = entry U0 (no-load voltage) of the motor from the motor table
n
rated
= entry N-N (rated speed) of the motor from the motor table
UZ = 800 V (maximum DC-link voltage if the power supply fails)
n
maxUz
800V
2
----------------
n
rated
⋅
U
0
--------------------------------------------=
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