Torque Reference Filter; Speed Limit In Torque Control - YASKAWA SGDV User Manual

5 Operation

5.5.3 Torque Reference Filter

5.5.3

Torque Reference Filter

This smooths the torque reference by applying a first order lag filter to the torque reference (T-REF) input.
Note: A setting value that is too large, however, will slow down response.
Check the response characteristics when setting this parameter.
Pn415
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
of the servomotor 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 servomotor.
Motor speed
Maximum speed
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.
Type
Output
Note: Use parameter Pn50F.1 to allocate the /VLT signal for use. For details, refer to 3.3.2 Output Signal Allocations.
(2) Speed Limit Setting
Select the speed limit mode with Pn002.1.
Pn002
5-44
T-REF Filter Time Constant
Setting Range
0 to 65535
With No Speed Limit
Danger of damage due to
critical speed.
Time
Signal Connector
Name Pin Number
/VLT Must be allocated
Parameter
n. 0 Uses the value set in Pn407 as the speed limit (internal
[Factory setting] speed limit function).
Uses V-REF (CN1-1, 2) as an external speed limit
input. Applies a speed limit using the input voltage of
n. 1
V-REF and the setting in Pn300 (external speed limit
function).
Setting Unit Factory Setting
0.01 ms 0
Limiting speed
Setting
ON (closed)
OFF (open)
Meaning
Speed Position Torque
When Enabled
Immediately
With Speed Limit
Motor speed
Safe operation with
speed limit.
Meaning
Servomotor speed limit being applied.
Servomotor speed limit not being applied.
When
Enabled
After restart
Classification
Setup
Time
Classification
Setup