
MPH-02, MPB-02, MPD-02 Drive Control 6-7
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Note: With a value of "0.00%" in parameter P-0-0572 the slip
compensation is switched off.
In the "U/f characteristic" function the respective voltage for the effective
output frequency is calculated from the motor model data.
The form of the characteristic in the basic range of setting, i.e. up to
P-0-4036, Rated motor speed, is selected with bit 13 in P-0-0045,
Control word of current controller:
• bit 13 = 1 → square characteristic
• bit 13 = 0 → linear characteristic
Note: The default setting in bit 13 of P-0-0045 is "0" (linear
characteristic).
P-0-0048
P-0-0577
P-0-0532
P-0-0045
motor data
DF000117v01_en.fh7
current
commutation
and PWM
f
out
U/f characteristic
monitoring
current
limitation
loop
oscilla-
tion
damping
IxR
boost
slip
compen-
sation
bit
13
stall pro-
tection
loop
P-0-0045: control word of current controller
P-0-0048: effective velocity command value
P-0-0532: premagnetization factor
P-0-0577: square characteristic: lowering factor
Fig. 6-8: Core function "U/f characteristic"
The output signal of the slip compensation is used as the input value for
the U/f characteristic.
With a square characteristic the degree of lowering can be adjusted in the
basic range of setting with the value in parameter P-0-0577, Square
characteristic: lowering factor. The value of 100% corresponds to the
original square curve. This lowering factor is reduced as the percentage
value decreases.
Note: The value "0.00%" in parameter P-0-0577 corresponds to the
linear characteristic.
By means of parameter P-0-0532, Premagnetization factor it is possible
to make a subsequent trimming of the machine’s magnetization. This
parameter can be configured in the MDT. If the premagnetization factor is
cyclically transmitted by a higher-level master, it can precontrol the
machine’s magnetization in an appropriate way in the case of an expected
change of load.
By means of parameter P-0-0573, IxR boost factor it is possible to
influence the precontrol of the output voltage in a load-depending way.
Note: With a value of "0.00%" in parameter P-0-0573 the precontrol
is switched off.
U/f Characteristic
IxR Boost
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