Can the Altivar 31 be used for constant torque and variable torque applications?
Resolution:
Yes. The ATV31 can be used for both constant torque (CT) and variable torque (VT) applications.
The torque characteristics are determined by the UFt (Voltage/Frequency Ratio) parameter, located in the drC- (Drive Control) menu.
Available UFt settings include:
- L: Constant torque. Recommended for special motors or motors connected in parallel.
- P: Variable torque. Recommended for pump and fan applications.
- n: Sensorless flux vector control. Recommended for constant torque applications.
- nLd: Energy-saving mode. Intended for variable torque applications that do not require high dynamic performance. It operates similarly to the P setting at no load and the n setting under load.
Important: Changing the UFt parameter resets UFr (IR Compensation) to its factory default value of 20%.
If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:
Frequently Asked Questions - Schneider Electric (se.com)
If this FAQ did not solve your issue, you can call us at 1-888-778-2733 Option 2 and then 4 or e-mail us atdrive.products.support@se.comto create a case with our Technical Support Team.
If you are not located in North America, please contact your local Customer Care Center for assistance:
Released for: Schneider Electric USA
