•
•
STW
Status word.
THD
Total harmonic distortion states the total contribution of harmonic distortion.
Thermistor
A temperature-dependent resistor placed where the temperature is monitored (drive or motor).
Trip
Trip is a state entered in fault situations. Examples of fault situations:
The drive is subject to an over voltage.
The drive protects the motor, process, or mechanism.
Restart is prevented until the cause of the fault has disappeared, and the trip state is canceled by activating reset or, in some cases,
by being programmed to reset automatically. Do not use trip for personal safety.
Trip lock
Trip lock is a state entered in fault situations when the drive is protecting itself and requiring physical intervention. For example, a
short circuit on the output triggers a trip lock. A locked trip can only be canceled by cutting off mains, removing the cause of the
fault, and reconnecting the drive. Restart is prevented until the trip state is canceled by activating reset or, sometimes, by being
programmed to reset automatically. Do not use trip lock for personal safety.
VT characteristics
Variable torque characteristics used for pumps and fans.
VVC
+
If compared with standard voltage/frequency ratio control, voltage vector control (VVC
+
) improves the dynamics and stability, both
when the speed reference is changed and in relation to the load torque.
60° AVM
Refer to the switching pattern 60° asynchronous vector modulation.
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Danfoss A/S © 2021.04
Appendix
VLT® Flow Drive FC 111
Design Guide
