5.5.3 Torque Reference Filter
This smoothens the torque reference by applying a first order lag filter to the torque reference (T-REF) input.
Note: A value that is too large, however, will slow down response.
5.5.4 Speed Limit in Torque Control
This function limits the speed of the servomotor to protect the machine.
A servomotor in torque control is controlled to output the specified torque, but the motor speed is not con-
trolled. Therefore, if an excessive reference torque is set for the load torque on the machinery side, the speed
may out run the torque of the machine and the speed of the motor may increase greatly. If that may occur, use
this function to limit the speed.
Note: The actual limit value of motor speed depends on the load conditions of the motor.
Refer to the following parameters for speed limit.
(1) Signals Output during Servomotor Speed Limit
The following signal is output when the motor speed reaches the limit speed.
For use, this output signal must be allocated. For details, refer to 3.3.2 Output Signal Allocations.
(2) Speed Limit Setting
Select the speed limit mode with Pn002.1.
Pn415
T-REF Filter Time Constant
Classification
Setting Range Setting Unit Factory Setting When Enabled
0 to 65535 0.01 ms 0 Immediately Setup
Speed
Motor speed
Speed limit
Safe operation with
speed limit.
Time
Type
Signal
Name
Connector
Pin Number
Name Meaning
Output /VLT Must be allocated
ON (close) Servomotor speed limit being applied.
OFF (open) Servomotor speed limit not being applied.
Parameter Meaning When Enabled Classification
Pn002
n.
0
Uses the value set in Pn407 as the speed limit (internal
speed limit function). [Factory setting]
After restart Setup
n.
1
Uses V-REF (CN1-5, 6) as an external speed limit
input. Applies a speed limit using the input voltage of
V-REF and the setting in Pn300 (external speed limit
function).
To Next Page
Loading...
