Danfoss FC 300 Design Manual page 11

FC 300 Design Guide 1. How to Read this Design Guide
Smart Logic Control (SLC)
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The SLC is a sequence of user-defined actions executed when the associated user-defined events
are evaluated as true by the SLC. (Parameter group 13-xx).
FC Standard Bus
Includes RS-485 bus with the FC protocol or MC protocol. See parameter 8-30.
Thermistor:
A temperature-dependent resistor placed where the temperature is to be monitored (adjustable
frequency drive or motor).
Trip
A state entered in fault situations, such as when the adjustable frequency drive is subject to an
overtemperature, or when the adjustable frequency drive is protecting the motor, process or
mechanism. Restart is prevented until the cause of the fault has rectified and the trip state is
cancelled by activating reset, or, in some cases, by programming an automatic reset. Trip may
not be used as a personal safety measure.
Trip-Locked
A state entered in fault situations when the adjustable frequency drive is protecting itself and
requiring physical intervention, such as when the adjustable frequency drive is subject to a short
circuit on the output. A locked trip can only be cancelled by cutting off line power, removing the
cause of the fault and reconnecting the adjustable frequency drive. Restart is prevented until the
trip state is cancelled by activating reset or, in some cases, by being programmed to reset auto-
matically. Trip may not be used as a personal safety measure.
VT Characteristics
Variable torque characteristics used for pumps and fans.
VVCplus
plus
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.
60° AVM
Switching pattern called 60° Asynchronous Vector Modulation (par. 14-00).
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MG.33.B9.22 - VLT ® is a registered Danfoss trademark.