Mitsubishi Electronics MR-J2-03A5 User Manual

3 -  27

3. SIGNALS AND WIRING

(b) Analog torque command offset

Using parameter No. 30, the offset voltage of -999 to +999mV can be added to the TC applied
voltage as shown below.

0

+

8(

−

8)

Max. torque

G

e

n

e

ra

ted t

o

rque

TC applied voltage [V]

Parameter No.30 offset range

−

999 to 

+

999mV

(2) Torque limit

By setting parameter No. 28 (internal torque limit 1), torque is always limited to the maximum value
during operation. A relationship between limit value and servo motor-generated torque is as in (2) in
section 3.4.1. Note that the analog torque limit (TLA) is unavailable.

(3) Speed limit

(a) Speed limit value and speed

The speed is limited to the values set in parameters No. 8 to 10 (internal speed limits 1 to 3) or the
value set in the applied voltage of the analog speed limit (VLA).
A relationship between the analog speed limit (VLA) applied voltage and the servo motor speed is
shown below.
When the motor speed reaches the speed limit value, torque control may become unstable. Make the
set value more than 100r/m smaller than the desired speed limit value.

−

10

0

+

10

Rated speed

Speed [r/min]

CCW direction

CW direction

VLA applied voltage [V]

Forward rotation (CCW)

Reverse rotation (CW)

Rated speed

The following table indicates the limit direction according to forward rotation selection (RS1) and
reverse rotation selection (RS2) combination:

(Note) External Input Signals

Speed Limit Direction

Analog Speed Limit (VLA)

RS1

RS2

+

 Polarity

−

 Polarity

Internal Speed

Commands

1

0

CCW

CW

CCW

0

1

CW

CCW

CW

Note.0: RS1/RS2-SG off (open)

1: RS1/RS2-SG on (short)

Generally, make connection as shown below:

SP1

SP2

SG

P15R

VC

LG

SD

1k

Ω

2k

Ω

Servo amplifier

Japan Resistor
RRS10 or equivalent