Summa Series Servodrive Product Manual
Application Functions
Document Version: V1.01
(Dec, 2019)
© 2019 ESTUN Automation Co., Ltd. All right reserved.
7-17
External Torque Limit Reference Signals
The /P-CL (Forward External Torque Limit) and /N-CL (Reverse External Torque Limit) signals are used
as the external torque limit reference signals. The /P-CL signal is used for the forward torque limit and the
/N-CL signal is used for the reverse torque limit.
Type Signal
Pin
Signal Status Meaning
Input
/P-CL
Allocated by
Pn509 or
Pn510
ON (closed)
Applies the forward external torque limit.
The torque is limited to the smaller of the
settings of Pn401 and Pn403.
OFF (open)
Cancels the forward external torque limit.
The torque is limited to the setting of Pn403.
/N-CL
ON (closed)
Applies the reverse external torque limit.
The torque is limited to the smaller of the
settings of Pn402 and Pn404.
OFF (open)
Cancels the reverse external torque limit.
The torque is limited to the setting of Pn404.
Setting the Torque Limits
If the setting of Pn401 (Forward Torque Limit), Pn402 (Reverse Torque Limit), Pn403 (Forward External
Torque Limit), or Pn404 (Reverse External Torque Limit) is too low, the torque may be insufficient for
acceleration or deceleration of the Motor.
Parameter
Name
Range
Unit Default
When Enabled
Pn401
Forward Internal Torque Limit
0 to 350
%
300
Immediately
Pn402
Reverse Internal Torque Limit
0 to 350
%
300
Immediately
Pn403
Forward External Torque Limit
0 to 350
%
100
Immediately
Pn404
Reverse External Torque Limit
0 to 350
%
100
Immediately
Changes in the Output Torque for External Torque Limits
The following table shows the changes in the output torque when the internal torque limit is set to 300%.
In this example, the Motor direction is set to Pn001.0=0 (Use CCW as the forward direction).
/PCL
/NCL
H Level
L Level
H Level
Torque
Speed
Pn402
Pn401
0
Torque
Speed
Pn404
Pn401
0
