MRESBW

ASCII - Command

MRESBW

 

 

Syntax Transmit

MRESBW [Data]

 

Syntax Receive

MRESBW <Data>

Available in

 

Type

Variable rw

MMI

Yes

ASCII Format

Integer16

CANBus Object Number

35A0 (hex)

DIM

Hz

PROFIBUS PNU

1760 (dec) IND = 0000xxxx (bin)

Range

25 .. 1200

DPR

160 (dec)

Default

600

 

Opmode

All

Data Type Bus/DPR

Integer16

Drive State

-

Weightning

 

Start Firmware

1.38

 

Configuration

No

Revision

1.8

Function Group

Feedback

EEPROM

Yes

Short Description

Resolver Bandwidth

Description

MRESBW is a tuning parameter that sets the bandwidth (in Hz) of the inner control loop. A high value (>800 Hz) results in a fast (low phase lag) and noisy velocity signal. A low value (<400 Hz) results in a slow (higher phase lag) and smooth velocity signal. The default value of 600 Hz is a compromise between phase lag and noise. The phase lag can be reduced by providing the acceleration feed forward signal (VLO = 1 ).

With a wide bandwidth, the drive responds more rapidly to control loop deviations and there is a smaller following error (reduced lag). A very wide bandwidth only makes sense with low moments of inertia, low KP, and very high acceleration values. A narrower bandwidth produces a filter effect. The rotational velocity and positional control are smoother (encoder equivalent output is quieter as well).

For the sensor less drive, the Luenberger Observer is used as the adaptive controller. Therefore, the parameter MRESBW corresponds to the bandwidth of the adaptive controller. It is normally set between 25 and 100 Hz.