Bosch Rexroth IndraDrive MPH-02 Functional Description page 220

6-8
Drive Control
stall pro-
monitoring
P-0-0048 tection
loop
DF000118v01_en.fh7
Oscillation Damping
stall pro-
monitoring
P-0-0048 tection
loop
DF000119v01_en.fh7
Current Limitation Loop
slip
compen-
sation
motor data
U/f
charac-
f
out
teristic
P-0-0048: effective velocity command value
P-0-0573: IxR boost factor
Fig. 6-9: Core function "IxR boost"
In open-loop operation, asynchronous machines in the case of low load
tend towards speed oscillations. With the oscillation damping it is possible
to counteract this behavior. The precontrol can be influenced with
parameter P-0-0574, Oscillation damping factor.
Note: With a value of "0.00%" in parameter P-0-0574 the precontrol
is switched off.
slip
compen-
sation
motor data
U/f
IxR
charac-
f
boost
out
teristic
P-0-0048: effective velocity command value
P-0-0574: oscillation damping factor
Fig. 6-10: Core function "oscillation damping"
It is the task of the current limitation loop to limit the maximum output
current by reducing the output voltage. This normally causes breakdown
of the motor. In this case, however, this has to be accepted because the
protection of motor and devices has the higher priority.
The current limitation loop only becomes active if the enabled stall
protection loop by changing the working point cannot reduce the drive
load.
MPH-02, MPB-02, MPD-02
IxR boost
P-0-0573
oscilla-
+
tion
damping
oscillation damping
P-0-0574
+
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
current
commutation
and PWM
current
limitation
loop
current
commutation
and PWM
current
limitation
loop