Power Factor; Regulatory Compliance; Ce Mark - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

Introduction
PI controller
The PI controller maintains the desired speed, pressure,
temperature, and so on, by adjusting the output frequency
to match the varying load.
RCD
Residual current device.
Set-up
Parameter settings in 2 set-ups can be saved. Change
between the 2 parameter set-ups and edit 1 set-up, while
another set-up is active.
Slip compensation
The frequency converter compensates for the motor slip by
giving the frequency a supplement that follows the
measured motor load keeping the motor speed almost
constant.
Smart logic control (SLC)
The SLC is a sequence of user-defined actions executed
when the associated user-defined events are evaluated as
true by the SLC.
Thermistor
A temperature-dependent resistor placed where the
temperature is to be monitored (frequency converter or
motor).
Trip
A state entered in fault situations, for example, if the
frequency converter is subject to an overtemperature or
when the frequency converter is protecting the motor,
process, or mechanism. Restart is prevented until the cause
of the fault does not exist and the trip state is canceled by
activating reset or, sometimes, by being programmed to
reset automatically. Do not use trip for personal safety.
Trip lock
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, 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
the stability, both when the speed reference is changed
and in relation to the load torque.
MG18C702
Design Guide

1.7 Power Factor

The power factor indicates to which extent the frequency
converter imposes a load on the mains supply. The power
factor is the ratio between I
fundamental current, and I
including harmonic currents. The lower the power factor,
the higher the I
Power factor =
The power factor for 3-phase control:
Power factor =
2
I I + I
=
RMS 1
A high-power factor indicates that the different harmonic
currents are low.
The frequency converters built-in DC coils produce a high-
power factor, which minimizes the imposed load on the
mains supply.

1.8 Regulatory Compliance

Frequency converters are designed in compliance with the
directives described in this section.

1.8.1 CE Mark

The CE mark (Communauté Européenne) indicates that the
product manufacturer conforms to all applicable EU
directives. The EU directives applicable to the design and
manufacture of frequency converters are listed in Table 1.4.
NOTICE
The CE mark does not regulate the quality of the
product. Technical specifications cannot be deduced from
the CE mark.
NOTICE
Frequency converters with an integrated safety function
must comply with the machinery directive.
EU directive
Low Voltage Directive
EMC Directive
ErP Directive
Table 1.4 EU Directives Applicable to Frequency Converters
Declarations of conformity are available on request.
Danfoss A/S © 04/2016 All rights reserved.
and I , where I
1 RMS
is the total RMS current
RMS
for the same kW performance.
RMS
3 × U × I
1 × COSϕ
3 × U × I
RMS
I × cosϕ1 I
1 1
= since cosϕ1 = 1
I I
RMS RMS
2 2 2
+ I + . . + I
5 7 n
1
is the
1
Version
2014/35/EU
2014/30/EU
9
1