Siemens SINAMICS PERFECT HARMONY GH180 - Closed Loop Vector Control (CLVC or CSMC); Permanent Magnet Motor Control (PMM)

4.7.8 Closed Loop Vector Control (CLVC or CSMC)
Closed loop vector control (CLVC or CSMC) is used for more precise speed control and for higher
torque at lower speeds. In applications where stable, low speed operation (below 1 Hz) under
high torque conditions is required, an encoder may be used to provide speed feedback. Encoder
speed feedback is directly used as an input to the speed regulator.
When an encoder is used with the drive, the control loop type is required to be set to CLVC for
closed loop vector control with an induction motor, or to CSMC for closed loop vector control
with a synchronous motor. Enable spinning load when using this control mode.
4.7.9 Permanent Magnet Motor Control (PMM)
Permanent magnet motor (PMM) control is used for permanent magnet motors, as these motors
have special starting requirements. Magnets in the PMM provide 󹪞ux. The drive does not have
to generate I
ds
to maintain 󹪞ux. Output power factor (PF) control is possible.
Although PMMs are considered synchronous motors, PMM control features di󹪜er from the
synchronous motor control types. One such di󹪜erence is that PMM control automatically
enables high starting torque mode.
Note
There is no encoder capability for use with PMM control mode. Do not use the CSMC for PMM
control to include an encoder, as this will not function correctly.
With PMM control, the 󹪞ux regulator output is disabled. Instead, I
ds,ref
is calculated based on the
Reactive Current mode (2981) selection. PF, as shown in the vector diagrams, is measured from
the drive output terminals, not from the motor reference.
The following 󹪝gure shows the control with the 󹪞ux regulator disabled.
)OX[5HI
)OX[
5HJXODWRU
$OO0RGHV
([FHSW300
$XWR'LVDEOHG
0DQXDORU
1HWZRUN
,QSXW
300


)OX['6
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,
GVUHI

Figure 4-6 Flux Regulator for PMM Control Mode
The possible selections for Reactive Current mode are as follows.
Note
Since the Auto and Auto Phase Advance modes increase the output power and voltage to the
motor, these modes must be disabled if attempting synchronous transfer of the PMM. The
Manual modes may also prevent proper operation of synchronous transfer.
NXGPro+ Control Description
4.7 Control Modes
NXGPro+ Control Manual
54 Operating Manual, A5E50491925A