5.19 I/O Signal Allocations
5.19.10 Speed Limit during Torque Control
5
Device-
S
pecific
S
etting
s
5-63
5.19.10 Speed Limit during Torque Control
You can limit the speed of the Servomotor to protect the machine.
When you use a Servomotor for torque control, the Servomotor is controlled to output the
specified torque, but the motor speed is not controlled. Therefore, if a reference torque is input
that is larger than the machine torque, the speed of the Servomotor may increase greatly. If that
may occur, use this function to limit the speed.
Note: The actual limit of Servomotor speed depends on the load conditions on the Servomotor.
/VLT (Speed Limit Detection Output) Signal
The signal that is output when the motor speed is being limited by the speed limit is described
in the following table.
Note: You must allocate the /VLT signal to use it. The parameters that you use depend on the allocation method.
Refer to the following section for details.
5.19.2 Output Signal Allocations
With No Speed Limit
With a Speed Limit
Type
Signal
Connector Pin No.
Signal Status
Meaning
Output
/VLT
Must be allocated.
ON (closed)
The Servomotor speed is being limited.
OFF (open)
The Servomotor speed is not being lim-
ited.
Allocation Method
Parameters to Use
Σ
-7S-Compatible I/O Signal
Allocations
•
Pn50A = n.
1 (
Σ
-7S-Compatible I/O Signal Allocations)
•
Pn50F = n.
X
(/VLT (Speed Limit Detection) Signal Allocation)
Multi-Axis I/O Signal Allocations
•
Pn50A = n.
2 (Multi-Axis I/O Signal Allocations)
•
Pn5B5 (/VLT (Speed Limit Detection) Signal Allocation)
S
peed
Danger of damage
due to hazardou
s
s
peed.
Time
Maximum
s
peed
S
peed
S
afe operation
with
s
peed limit.
Time
S
peed
limit