A state entered in fault situations, e.g., if 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 disappeared and the trip state is canceled by activating

reset or, in some cases, by being programmed to reset automatically. Trip may not be used for personal safety.

Trip Locked

A state entered in fault situations when the adjustable frequency drive is protecting itself and requiring physical intervention, e.g., if the adjustable

frequency drive is subject to a short circuit on the output. A locked trip can only be canceled 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 canceled by activating reset or, in some cases, by being

programmed to reset automatically. Trip may not be used for personal safety.

VT Characteristics

Variable torque characteristics used for pumps and fans.

plus

VVC

If compared with standard voltage/frequency ratio control, Voltage Vector Control (VVC

reference is changed and in relation to the load torque.

60° AVM

Switching pattern called 60° Asynchronous Vector Modulation (par. 14-00

Power Factor

The power factor is the relation between I

The power factor for 3-phase control:

The power factor indicates to which extent the adjustable frequency drive

imposes a load on the line power supply.

The lower the power factor, the higher the I

formance.

In addition, a high power factor indicates that the different harmonic currents are low.

All Danfoss adjustable frequency drives have built-in DC coils in the DC link to increase the power factor and to reduce the THD on the line power supply.

1-6

Switching Pattern

and I

RMS

for the same kW per-

RMS

MG.33.BC.22 - VLT

plus

) improves the dynamics and the stability, both when the speed

x U x I

cos

Power factor