SD710 Series Servo Drive User Manual Chapter 5 Commissioning and Operation
12
Note
●
If the set value exceeds the maximum torque of the servo motor used, the actual torque is also
limited to the maximum torque of the servo motor.
If the setting value is too small, insufficient torque may occur when the servo motor accelerates or
decelerates, so set it according to the actual situation.
(2) Torque Limiting Output Signal (TLT)
When ON is output in torque limiting, it indicates that the motor output torque is in the limiting state. The current status of
the motor torque limit can be confirmed by this signal.
Setting
Symbol
Functional name
Instructions
Trigger
method
Running
mode
0x05
TLT
Torque limitation
This signal is output ON when the
output torque of the motor is within
the set range.
When the output torque of the click is
outside the set range, this signal is
output OFF.
level
trigger
□
P
□
S
□
T
(3) Torque Limitation at Undervoltage
The undervoltage warning is detected when the main circuit DC voltage inside the servo unit is below the specified value
due to a transient power failure or short time supply of the main circuit supply voltage; the output current can be optionally
limited at this time, and the relevant parameters are shown in the table below.
Function
code
Parameter name
Range
Default
value
Unit
Pn045
Function selection in case of main
circuit (DC) undervoltage
0: No undervoltage warning detected
1: Detect undervoltage warning
2: Detect undervoltage warning and
simultaneous torque limiting via
Pn041 and Pn042
0
-
Pn046
Torque limiting when main circuit
voltage drops
0 to 100
50
%
Pn047
Torque limit release time when main
circuit voltage drops
0 to 1000
100
ms
By combining this function with the instant stop hold time setting function, it is possible to avoid shutdown due to an alarm
when the power supply voltage is insufficient and continue operation without power restoration operations.
Undervoltage warning, torque limit is applied inside the servo unit. After receiving the undervoltage warning release signal,
the torque limit value is controlled within the servo unit according to the set release time, and the logic timing is shown in
Figure 5.14. In Figure 5.14.
When the main circuit input supply voltage is AC200V, b = 200V and a = 280V
When the main circuit input supply voltage is AC400V, a = 560V and b = 400V.
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