Specifications

ManualsBrandsMitsubishi ManualsAmplifierMelservo-J3 Series MR-J3-B

8 9

The power to perform

The power to perform /// The power to perform /// The power to perform /// The power to perform /// The power to perform /// The power to perform /// The power to perform

Increased response

speed

The MR-J3’s 900Hz speed-frequency

response rate is over 30% faster than exist-

ing models. For users this means faster

operation, greater precision, faster retool-

ing in production, less wastage and better

product quality.

Reduced

component size

The reduced component size is critically

important to machine designers who are

often called upon to sqeeze all of the con-

trol solutions they need into the smallest

deliverable package. The MR-J3 series

boasts an intelligent design that has

reduced amplifier sizes by up to 40 % and

motor lengths by almost a quarter. This

means machine designers don't have to

make as many compromises to get the

right motor and deliver the right power in

the right place. These servos’ compact

dimensions enable flexible installation and

economical design, which helps you to

keep your costs down and be more com-

petitive in the global economy.

Intelligent functions

for any application

Every detail of the MR-J3 series is designed

for performance and reliability, from the

intelligent drive electronics to the robust

mechanical components. These next-gen-

eration servo systems are both compact

and flexible, featuring Plug & Play function-

ality, fibre-optics technology and optical

feedback systems.

Firmware that

delivers

performance

All MR-J3 servo amplifiers use the very lat

est regulation and control technologies.

These systems ensure fast installation and

setup and make it possible to configure sta-

ble systems with very short response times

– no matter what your application.

쐽 Real-Time Auto-tuning

The real-time auto-tuning function sets the

servo’s control parameters automatically,

eliminating the need to calibrate the sys-

tem for each individual application. But

that’s not all – auto-tuning also works con-

tinuously while the system is in operation,

making constant adjustments to cater for

applications with fluctuating moments of

inertia. This makes it possible to use these

servos in a much wider range of applica-

tions.

Precise tuning

functions

쐽 Advanced suppression of

mechanical vibration

Advanced vibration suppress control is

designed to suppress the vibrations in Cat-

egory 2 above. It is effective in suppressing

residual vibrations at the time ofsettling

during positioning operation.

The primary control method of the MR-J3 is

Model Adaptive Control. In this method,

the motor is driven in such a manner that

the tip of the given machinery moves

together with the reference model applied.

Under Advanced vibration suppress con

trol, it uses a mechanical vibration model

from reference model to generate a drive

pattern that prevent the tip of machinery

from vibrating, thereby suppressing any

residual vibration. Advanced vibration

suppress control can extract vibration

components from actual motor move

ments. It identifies the vibration character-

istics of the machinery in real time, and

automatically make adjustment to the

mechanical vibration model.

쐽 Adaptive filtering

The optimum machine resonance sup-

pression filter is automatically set to sup-

press resonance without even measuring

the machine system’s (drive shaft) fre-

quency characteristics. The adaptive fre-

quency range has been increased

compared to the prior models, so reso-

nance at the drive shaft can also be sup-

pressed.

When a given machine has a mechanical

resonance at a high frequency, (in the

range of several hundred Hz and above.)

increase control gain will cause the control

system to oscillate in this vibration mode

and subsequently lose control. In order to

overcome the mechanical resonance, it is

common practice to insert a machine reso-

nance suppression filter into the control

loop to prevent oscillation. Adaptive filter II

is a function that automatically set this

machine resonance suppression filter in

real time.

SSCNET III – The

benchmark standard

In addition to conventional pulse train posi-

tioning, the MR-J3 series also supports the

SSCNET III high-speed motion control net-

work. The SSCNET III is a high-speed syn-

chronous network using an optical fiber

cable. The MR-J3-B servo amplifier is con-

nected to a control device with SSCNET III

interface (e.g Q172HCPU, QD75MH motion

controller or FX3U-20SSC-H interface mod-

ule). As for the communications specifica-

tions of SSCNET III, it can control up to 32

axes per master interface with the trans-

mission rate of 50 Mbps and command

communications period of 0.4 ms.

Since long-distance wiring has become

possible, it is possible to locate the control-

ler’s control panel and drive units far apart

and spread widely in a large-scale facility or

a large-scale production line. This, in turn,

will shorten the cable between amplifier

and motor in machines where there is a rel-

atively large amount of wiring.

As for the servo adjustments, a servo set-

ting and support tool, MT Developer can be

used over SSCNET III, just simply connect a

personal computer to the motion control-

ler makes it possible to perform controller

settings and servo parameters of all the

connected axes to SSCNET III.

Bottle filling with increased productvity by deacreased cycle times thanks to short settling time.

High speed response of 900 Hz offers shortest settling

times resulting in short cycle times.

In applications with extreme load vibrations this func

tion significantly improves both performance and sys

tem response.

Without vibration

suppression

With vibration

suppression

6000

HF-KP

HC-KFS

Speed (rpm)

Shorter positioning time

Time

(Old)

(New)

500

1000

-500

-1000

500

1000

-500

-1000

0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 5

Adaptive filter (upper figure) to suppress drive shaft vi-

brations such as in a ball screw

Frequency

Time

3 dB

900 Hz