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5 gain changing function, 1 applications, 2 function block diagram – MITSUBISHI ELECTRIC MELSERVO MR-J2S- A User Manual

Page 186: Special adjustment functions

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8. SPECIAL ADJUSTMENT FUNCTIONS

8.5 Gain changing function

This function can change the gains. You can change between gains during rotation and gains during stop
or can use an external signal to change gains during operation.

8.5.1 Applications

This function is used when:
(1) You want to increase the gains during servo lock but decrease the gains to reduce noise during rotation.
(2) You want to increase the gains during settling to shorten the stop settling time.
(3) You want to change the gains using an external signal to ensure stability of the servo system since the

load inertia moment ratio varies greatly during a stop (e.g. a large load is mounted on a carrier).

8.5.2 Function block diagram

The valid control gains PG2, VG2, VIC and GD2 of the actual loop are changed according to the conditions
selected by gain changing selection CDP (parameter No. 65) and gain changing condition CDS (parameter
No. 66).

Valid

GD2 value

Command pulse
frequency

Droop pulses

Model speed

External signal

CDP

Comparator

Valid

PG2 value

Valid

VG2 value

Valid

VIC value

Changing

PG2 PG2B

100

VIC VICB

100

VG2 VG2B

100

GD2

Parameter No.61

GD2

Parameter No.34

PG2

Parameter No.35

VG2

Parameter No.37

VIC

Parameter No.38

CDP

Parameter No.65

CDS

Parameter No.66