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3. SIGNALS AND WIRING
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.
5
Connection example
Japan resistor
RRS10 or equivalent
TLA application voltage vs.
torque limit value
TLA application voltage [V]
0
0
0.05
10
(Note)
TL
DOCOM
P15R
TLA
LG
SD
2k
2k
Servo amplifier
To
rq
ue
l
im
it
v
a
lue
[
] 100
Note. For the sink I/O interface. For the source I/O interface, refer to section 3.8.3.
(b) Torque limit value selection
As shown below, the forward rotation torque limit (parameter No.PA11), or reverse rotation torque limit
(parameter No. PA12) and the analog torque limit (TLA) can be chosen using the external torque limit
selection (TL).
When internal torque limit selection (TL1) is made usable by parameter No.PD03 to PD08, PD10 to
PD12, internal torque limit 2 (parameter No.PC35) can be selected. However, if the parameter No.PA11
and parameter No.PA12 value is less than the limit value selected by TL/TL1, the parameter No.PA11
and parameter No.PA12 value is made valid.
(Note) Input device
Limit value status
Validated torque limit values
TL1
TL
CCW driving/CW
regeneration
CW driving/CCW
regeneration
0
0
Parameter No.PA11
Parameter No.PA12
0
1
TLA
Parameter No.PA11
Parameter No.PA11
Parameter No.PA12
Parameter No.PA12
TLA
Parameter No.PA11
TLA
TLA
Parameter No.PA12
1
0
Parameter No.PC35
Parameter No.PA11
Parameter No.PA11
Parameter No.PA12
Parameter No.PA12
Parameter No.PC35
Parameter No.PA11
Parameter No.PC35
Parameter No.PC35
Parameter No.PA12
1
1
TLA
Parameter No.PC35
Parameter No.PC35
Parameter No.PC35
TLA
Parameter No.PC35
TLA
TLA
Note. 0: off
1: on
(c) Limiting torque (TLC)
TLC turns on when the servo motor torque reaches the torque limited using the forward rotation torque
limit, reverse rotation torque limit or analog torque limit.
Driver