Danfoss VLT Micro Drive FC 51 Design Guide

to reset automatically. Trip may not be used for personal
safety.
Trip Locked
A state entered in fault situations when the frequency
converter is protecting itself and requiring physical
intervention, for example, if the frequency converter is
subject to a short circuit on the output. A locked trip can
only be canceled by cutting off mains, removing the cause
of the fault, and reconnecting the frequency converter.
Restart is prevented until the trip state is canceled by
activating reset or, in some cases, by being programmed
to reset automatically. Trip locked may not be used for
personal safety.
VT Characteristics
Variable torque characteristics used for pumps and fans.
VVC
plus
If compared with standard voltage/frequency ratio control,
Voltage Vector Control (VVC
plus
) improves the dynamics
and the stability, both when the speed reference is
changed and in relation to the load torque.
1.1.6 Power Factor
The power factor is the relation between I
1
and I
RMS
.
Power factor =
3 ×
U × I
1 × COS ϕ
3 ×
U × I
RMS
The power factor for 3-phase control:
=
I
1
× cos ϕ1
I
RMS
=
I
1
I
RMS
since cos ϕ1 = 1
The power factor indicates to which extent the frequency
converter imposes a load on the mains supply.
The lower the power factor, the higher the I
RMS
for the
same kW performance.
I
RMS
= I
1
2
+ I
5
2
+ I
7
2
+ . . + I
n
2
In addition, a high-power factor indicates that the different
harmonic currents are low.
How to Read this Design Gui...
VLT
®
Micro Drive FC 51 Design Guide
MG02K202 - VLT
®
is a registered Danfoss trademark
9
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Danfoss VLT Micro Drive FC 51 Specifications

General

Enclosure	IP20
Output Voltage	0-100% of supply voltage
Altitude	Up to 1000 m without derating
Power Range	0.18-22 kW
Control Method	V/f
Communication	Modbus RTU
Protection Features	Over-voltage, under-voltage, over-current, over-temperature
Ambient Temperature	-10°C to 50°C
Storage Temperature	-25°C to 65°C
Relative Humidity	5-95% (non-condensing)
Input Voltage	200-240 V, 380-480 V
Braking Function	Integrated braking chopper (optional)