YASKAWA SGDH User Manual page 497

(2) Internal Speed Limit Function
Pn407 Speed Limit During Torque Control
Sets the servomotor speed limit value during torque control.
The setting in this parameter is enabled when Pn002 = n.
The servomotor's maximum speed will be used when the setting in this parameter exceeds the maximum speed of the ser-
vomotor used.
(3) External Speed Limit Function
Type Signal
Name
Input V-REF
SG
Inputs an analog voltage reference as the servomotor speed limit value during torque control.
The smaller value is enabled, the speed limit input from V-REF or the Pn407 (Speed Limit during Torque Control) when
Pn002 = n. 1 .
The setting in Pn300 determines the voltage level to be input as the limit value. Polarity has no effect.
Pn300 Speed Reference Input Gain
(1.50 to 30.0 V/rated speed)
Sets the voltage level for the speed that is to be externally limited during torque control.
With Pn300 = 600 (factory setting) and 6 V input from V-REF (CN1-5, 6), the actual motor speed is limited to the rated
speed of the servomotor used.
The Principle of Speed Limiting
INFO
When the speed is outside of the allowable range, a torque that is proportional to the difference between the actual speed
and the speed limit is used as negative feedback to bring the speed back within the speed limit range. Accordingly, there is
a margin generated by the load conditions in the actual motor speed limit value.
(4) Signals Output during Servomotor Speed Limit
Type Signal
Name
Output /VLT
This signal is output when the servomotor speed reaches the speed limit value set in Pn407 or set by the analog voltage ref-
erence.
For use, this output signal must be allocated with parameter Pn50F. For details, refer to 7.3.3 Output Circuit Signal Alloca-
tion.
Setting Range Setting Unit
0 to 10000
Connector
Pin Number
CN1-5 External Speed Limit Input
CN1-6 Signal Ground
Setting Range
150 to 3000 0.01 V/rated speed
Connector
Pin Number
Must be allocated ON (low level)
CN1-
OFF (high level) Servomotor speed limit not being applied.
Factory Setting
10000
-1
min
0 .
Name
Setting Unit Factory Setting
600
(6.00 V/rated speed)
Setting
Servomotor speed limit being applied.
8-65
8.7 Operating Using Torque Control
Torque
Setting Validation
Immediately
Speed Position Torque
Setting Validation
Immediately
Meaning
8