MITSUBISHI ELECTRIC MR-E- A/AG - Manual (Page 265)

15 - 20
15. MR-E- AG SERVO AMPLIFIER COMPATIBLE WITH ANALOG INPUT
(c) Torque limit
1) Torque limit and 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 torque is shown
below.
0
0 100
Max. torque
to
rq
u
e
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. Torque limit values will vary about 5% relative to the
voltage depending on products.
At the voltage of less than 0.05V, torque may vary as it may not be limited sufficiently.
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
0 10
5%
0.05
T
o
rque l
im
it
va
lue [
%
]
TLA application voltage vs.
torque limit value
TLA application voltage [V]
2) Torque limit value selection
Use parameters No. 43 through 48 to enable external torque limit (TL) and internal torque
limit. Torque limit values can be selected as shown in the following table. However, if the
parameter No. 28 value is less than the limit value selected by TL/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)
0 1
TLA Parameter No. 28: Parameter No. 28
TLA Parameter No. 28: TLA
1 0
Parameter No. 76 Parameter No. 28: Parameter No. 28
Parameter No. 76 Parameter No. 28: Parameter No. 76
1 1
TLA Parameter No. 76: Parameter No. 76
TLA Parameter No. 76: TLA
Note.0: off
1: on