98 Chapter 7 - Parameters Description
User Manual
P.221 DC-lnk ctr Pgain
(DC link control proportional gain)
Proportional gain of the DC link control regulation.
- a setting too low could have a slow reaction on the regulation response.
- a setting too high could have a too fast reaction with consequent oscillations of the system.
P.222 DC-lnk ctr Igain
(DC link control integral gain)
Integral gain of the DC link control regulation.
- a setting too low can have a slow reaction on the regulation response.
- a setting too high can have a too fast reaction with consequent oscillations of the DC link.
P.223 DC-link ctr FF
(DC link control feed forward)
As described in the figure beow, this is the setting of the feed-forward for the DC control function.
At the increasing of the DC link level, a quick frequency step (percentage of the motor slip), is automatically
added to the reference. The voltage level decreases toward its rated value.
P.223
n
t
Ramp Profile
Set
Safety
V
Dclink
t
0V Thr
RATED
Dclink
Figure 7.6.10: DC Link Voltage Control
The "overvoltage " alarm will be displayed with the message "OV".
A signalling of the "DC link" status is available on the digital output as "
DC bus limit
".
Code
Name
[Code] & Function.
Default
MIN
MAX
Unit
Variation
IPA
P.220
En DC link ctrl
[0] None
0
0
2
434
[1] PI Limiter
[2] Ramp freeze
P.221
DC-lnk ctr Pgain
20.0
0.1
100
%
0.1
435
P.222
DC-lnk ctr Igain
2.0
0.1
100
%
0.1
436
P.223
DC-link ctr FF
0
0
250
%
437
Over Torque Alarm Configuration
The torque of the motor (active current) can be monitored through this function.
In particular the overtorque condition and the behaviour of the drive itself, are manageable by these parameters.
P.240 OverTorque mode
It defines the status of the drive during its overtorque condition.
P.240 = 0
Overtorque signalling during ramps and at steady state. No alarm will be generated.
