Signals and wiring – MITSUBISHI ELECTRIC MELSERVO MR-J2S- A User Manual

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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.

8( 8)

Max. torque

Generat

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 torque is as in (5) 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, 72 to 75 (internal speed limits 1 to
7) 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 servo motor speed reaches the speed limit value, torque control may become unstable.
Make the set value more than 100r/min greater than the desired speed limit value.

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

Internal speed

commands

CCW

Note. 0: off

1: on

Generally, make connection as shown below:

SP1

SP2

P15R

Servo amplifier

Japan resistor
RRS10 or equivalent