Mitsubishi Electronics MR-J2S- CL Guideline for setting the electronic gear is, Parameters No

5. PARAMETERS

5.2Detailed explanation 5.2.1 Electronic gear

CAUTION	False setting will result in unexpected fast rotation, causing injury.
	POINT
	The guideline for setting the electronic gear is	1	CMX	1000.
		10	CDV

If you set any value outside this range, noise may be produced during acceleration/deceleration or operation not performed at the preset speed or acceleration/deceleration time constant.

After setting the parameter No.4, 5 value, switch power off, then on to make that setting valid. In this case, execute a home position return again.The absolute position detection system also requires a home position return.

(1)Concept of electronic gear

Use the electronic gear (parameters No.4, 5) to make adjustment so that the servo amplifier setting matches the moving distance of the machine. Also, by changing the electronic gear value, the machine can be moved at any multiplication ratio to the moving distance on the servo amplifier.

CMX	Parameters No. 4
CDV	Parameters No. 5

Moving distance	CDV	-		counter	Motor
	CMX	+		Deviation
			Encoder feedback pulses
Electronic gear					Encoder
Parameters No. 4, 5

The following examples are used to explain how to calculate the electronic gear value:

POINT

The following specification symbols are needed for electronic gear

calculation:

Pb

: Ballscrew lead [mm(in.)]

n

: Reduction ratio

Pt

: Servo motor resolution [pulse/rev]

S

: Travel per servo motor revolution [ m/rev]

(a) Ballscrew setting example

n=NL/NM=1/2

n

Machine specifications

Ballscrew lead: Pb

10 (0.39) [mm(in.)]

NL

Pb=10(0.39)[mm(in.)]

Reduction ratio: n

1/2

NM

Servo motor resolution: Pt

131072 [pulse/rev]

Servo motor 131072[pulse/rev]

CMX

pt

pt

131072

131072

32768

CDV

5000

625

S

n pb 1000

1/2

10 1000

Hence, set 32768 to CMX and 625 to CDV.

(b) Conveyor setting example

r=160(6.30)[mm(in.)]

Machine specifications

Pulley diameter: r

160 (6.30) [mm(in.)]

Servo motor

n

Reduction ratio: n

1/3

NL NM

131072[pulse/rev]

Servo motor resolution: Pt

131072 [pulse/rev]

n=NL/NM=1/3

CMX

pt

pt

131072

131072

32768

CDV

S

n

r

1000

1/3 160

1000

167551.61

41888

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