T
THD
Total harmonic distortion states the total contribution of harmonics.
T
M,N
Rated torque (motor).
Target position
The final target position specified by positioning commands. The profile
generator uses this position to calculate the speed profile.
Thermistor
A temperature-dependent resistor placed on the drive or the motor.
Trip
A state entered in fault situations, for example, if the drive is subject to an
overtemperature or when the drive is protecting the motor, process, or
mechanism. The drive prevents a restart until the cause of the fault has dis-
appeared. To cancel the trip state, restart the drive. Do not use the trip state
for personal safety.
Trip lock
The drive enters this state in fault situations to protect itself. The drive re-
quires physical intervention, for example when there is a short circuit on
the output. A trip lock can only be canceled by disconnecting mains, re-
moving the cause of the fault, and reconnecting the drive. Restart is preven-
ted until the trip state is canceled by activating reset or, sometimes, by be-
ing programmed to reset automatically. Do not use the trip lock state for
personal safety.
U
U
M
Motor voltage.
U
M,N
Rated motor voltage (nameplate data).
U
VLT,MAX
Maximum output voltage.
V
VT characteristics
Variable torque characteristics typical for many pumps and fans.
VVC
+
If compared with standard voltage/frequency ratio control, Voltage Vector
Control (VVC
+
) improves the dynamics and the stability, both when the
speed reference is changed and in relation to the load torque.
Η
η
VLT
The efficiency of the drive is defined as the ratio between the power output
and the power input.
AU275636650261en-000101/130R0334 | 721
Danfoss A/S © 2022.12
Glossary
VLT AutomationDrive FC 301/302
Programming Guide
Summary of Contents for VLT AutomationDrive FC 301
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