MPH-02, MPB-02, MPD-02
Drive Control
6-5
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
•
P-0-0576, Search mode: finding point slip factor
•
P-0-0577, Square characteristic: lowering factor
•
P-0-4036, Rated motor speed
•
P-0-4040, Rotor leakage inductance
•
P-0-4046, Effective peak current
•
E8040 Torque/force actual value limit active
•
E8041 Current limit active
•
E8260 Torque/force command value limit active
Functional Description
The figure below illustrates the core functions of open-loop U/f control:
P-0-0048
S-0-0040
P-0-0569
U
DF000114v01_en.fh7
current
commutation
and PWM
f
out
current
limitation
loop
oscillation
damping
IxR
boost
U/f
charac-
teristic
slip
compen-
sation
stall pro-
tection
loop
monitoring
E8260
U
U
U
U
E8040
E8041
P-0-0065
S-0-0040:
velocity feedback value
P-0-0048:
effective velocity command value
P-0-0065:
absolute voltage value, actual value
P-0-0569:
maximum stator frequency change
Fig. 6-5:
Overview of open-loop U/f control
The maximum change of velocity with which the drive can follow the
command values is determined by the motor and the sampling time of the
stall protection loop. The limit value can be set in parameter
P-0-0569,
Maximum stator frequency change
.
When the torque limits in the case of motive and generating load have
been reached, the "breakdown" of the asynchronous machine is
prevented by the so-called stall protection loop.
The stall protection loop is enabled via bit 12 of parameter
P-0-0045,
Control word of current controller
:
•
bit 12 = 1
→
stall protection loop enabled
•
bit 12 = 0
→
stall protection loop switched off
Note:
The default setting in bit 12 of P-0-0045 is "0" (stall protection
loop deactivated).
Pertinent Diagnostic Messages
Maximum Stator Frequency
Change
Stall Protection Loop
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
