Mitsubishi Electronics MR-J2S- A - page 60

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3. SIGNALS AND WIRING
(5) Torque limit
(a) Torque limit and generated torque
By setting parameter No. 28 (internal torque limit 1), torq ue is always limite d to the maximum
value during operation. A relationship between the limit value and servo motor-generated torque is
shown below.
00 100
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, gene rated torque m ay vary as it m ay not be limite d suffic iently .
Therefore, use this function at the voltage of 0.05V or more.
2k 2k
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]
(b) Torque limit value selection
Choose the torque limit made valid by the internal torque limit value 1 (parameter No. 28) using
the external torque limit selectio n (TL) or the torque limi t made valid by the analo g torque limit
(TLA) as indicated below.
When internal torque limit selec tion (TL1) is made usable by parameter No. 43 to 48, internal
torque limit 2 (parameter No. 76) can be selected. However, if the parameter No . 28 value is le ss
than the limit value selected by T L/TL1, the parameter No. 28 value is made valid.
(Note) External input signals
TL1 TL Torque limit value made valid
0 0 Internal torque limit value 1 (parameter No. 28)
01 TLA Parameter No. 28: Parameter No. 28
TLA Parameter No. 28: TLA
10 Parameter No. 76 Parameter No. 28: Parameter No. 28
Parameter No. 76 Parameter No. 28: Parameter No. 76
11 TLA Parameter No. 76: Parameter No. 76
TLA Parameter No. 76: TLA
Note.0: TL/TL1-SG off (open)
1: TL/TL1-SG on (short)
(c) Limiting torque (TLC)
TLC-SG are connected when the tor que generated by the servo moto r reaches the torque set to
internal torque limit value 1 or analog torque limit.