6-8
Drive Control
MPH-02, MPB-02, MPD-02
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
P-0-0048
motor data
P-0-0573
+
DF000118v01_en.fh7
current
commutation
and PWM
f
out
IxR boost
monitoring
current
limitation
loop
oscilla-
tion
damping
slip
compen-
sation
U/f
charac-
teristic
stall pro-
tection
loop
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.
P-0-0048
motor data
P-0-0574
DF000119v01_en.fh7
current
commutation
and PWM
f
out
oscillation damping
monitoring
current
limitation
loop
slip
compen-
sation
U/f
charac-
teristic
IxR
boost
stall pro-
tection
loop
+
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.
Oscillation Damping
Current Limitation Loop
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
