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3. SIGNALS AND WIRING
(2) Torque limit
CAUTION
If the torque limit is canceled during servo lock, the servomotor may suddenly
rotate according to position deviation in respect to the command position.
(a) Torque limit and generated torque
By setting parameter No. 28 (internal torque limit 1), torque is always limited to the maximum
value during operation. A relationship between the limit value and servo motor-generated torque is
shown below.
0
0100
Max. torque
Generated torque
Torque limit value [%]
A relationship between the applied voltage of the analog torque limit (TLA) and the torque limit
value of the servo motor is shown below. Generated torque limit values will vary about 5% relative
to the voltage depending on products.
At the voltage of less than 0.05V, generated torque may vary as it may not be limited sufficiently.
Therefore, use this function at the voltage of 0.05V or more.
2kΩ
2kΩ
Servo amplifier
Japan Resistor
RRS10 or equivalent
TL
SG
P15R
TLA
LG
SD
100
0
010
±5%
0.05
Torque limit value [%]
TLA application voltage vs.
torque limit value
TLA application voltage [V]