7.2.11 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.
The actual limit of motor speed depends on the load conditions on the
Servomotor.
With No Speed Limit With a Speed Limit
Speed
Maximum speed
Danger of damage due
to hazardous speed.
Time
Speed
Safe operation
with speed limit.
Time
Speed limit
The signal that is output when the motor speed is being limited by the speed limit is
described in the following table.
Type Signal Connector Pin
No.
Signal Status Meaning
Output /VLT Must be allo-
cated.
ON (closed) The Servomotor
speed is being
limited.
OFF (open) The Servomotor
speed is not
being limited.
You must allocate the /VLT signal to use it. Use Pn50F = n.
X
(/VLT
(Speed Limit Detection) Signal Allocation) to allocate the signal to a con-
nector pin. Refer to the following section for details.
Ä
Chap. 7.2.3 ‘Output Signal Allocations’ page 198
/VLT (Speed Limit Detec-
tion) Signal
Sigma-7 Series SERVOPACKs
Application Functions
I/O Signal Allocations > Speed Limit during Torque Control
| | PROFINET Communications - SIEP YEUOC7P 02A Revision 0 | en | 207
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