Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 73

3. SIGNALS AND WIRING
(3) Ready (RD)
Servo-on (SON)
Alarm
Ready (RD)
(4) Torque limit
CAUTION
(a) Torque limit and torque
By setting parameter No. PA11 (forward torque limit) or parameter No. PA12 (reverse torque limit),
torque is always limited to the maximum value during operation. A relationship between the limit value
and servo motor torque is shown below.
Reverse rotation (CW) direction
(b) Torque limit value selection
As shown below, the internal torque limit selection (TL1) can be used for selecting the torque limit
between the forward torque limit (parameter No. PA11) or the reverse torque limit (parameter No. PA12)
and the internal torque limit 2 (parameter No. PC14).
However, if the value of parameter No. PA11 or parameter No. PA12 is lower than the limit value
selected by TL1, the value of parameter No. PA11 or parameter No. PA12 is made valid.
(Note) Input
device
TL1
0
Parameter No. PC14
1
Parameter No. PC14
Note. 0: off
1: on
ON
OFF
Yes
No
100ms or less 10ms or less
ON
OFF
If the torque limit is canceled during servo lock, the servo motor may suddenly
rotate according to position deviation in respect to the command position.
When using the torque limit, check that load to motor inertia moment ratio
(parameter No. PB06) is set properly. Improper settings may cause an unexpected
operation such as an overshoot.
Max. torque
100
Torque limit value in
parameter No. PA12
Limit value status
Parameter No. PA11
Parameter No. PA12
Parameter No. PA11
Parameter No. PA12
Forward rotation (CCW) direction
[%]
0 100
Torque limit value in
parameter No. PA11
Validated torque limit values
Forward rotation (CCW)
driving
Reverse rotation (CW)
regeneration
Parameter No. PA11
Parameter No. PA11
Parameter No. PC14
3 - 24
10ms or less
Reverse rotation (CW)
driving
Forward rotation (CCW)
regeneration
Parameter No. PA12
Parameter No. PA12
Parameter No. PC14