Torque Limit - Mitsubishi melservo-j2 series Instruction Manual

3. SIGNALS AND WIRING

3.4.4 Torque limit

The following table lists the signals and parameters related to the torque limit:
Item
Analog input signal
Contact input signals
Contact output signal
Parameters
The torque limit is available in two types: internal torque limit set in parameters and external torque
limit using analog input signal. This function limits generated torque on the assumption that the
maximum torque of the servo motor is 100%.
(1) Internal torque limits 1, 2
Use parameter No.28 and 29 to set the internal torque limit values. The following graph shows the
generated torque relative to the setting.
(2) External torque limit (TLA)
By applying a voltage (0 to 10V) to the external torque limit (TLA) terminal, limit values can be set
from outside consecutively. The following graph shows the relationship between input voltage and
limit value.
Depending on the servo amplifier, the limit value has about 5% variations to the input voltage. As this
may not cause torque to be limited sufficiently at less than 0.05V, use this function at the voltage of
0.05V or more.
Refer to the following diagram when using the 15V power output (P15R) of the servo amplifier:
POINT
• To use the torque limit, make the external torque limit selection (TL)
device and internal torque limit selection (TL2) device available.
Name
External torque limit (TLA)
External torque limit selection (TL)
Internal torque limit selection (TL2)
Limiting torque (TLC)
No.28 internal torque limit 1
No.29 internal torque limit 2
No.26 torque limit offset
No.20 selection function 2
Max. torque
100
5%
0
0 0.05 10
TLA application voltage [V]
TLA Application Voltage vs.
Torque Limit Value
Servo Configuration Software setting
required.
0 to 100%
0 to 100%
999 to 999mV
Selection of the rotation direction in which
torque limit is executed
0
0 100
Torque limit value [%]
2k
2k
Japan Resistor RRS10
or equivalent
Connection Example
3 - 14
Remarks
Servo amplifier
TL
SG
P15R
TLA
LG
SD