Danfoss VLT HVAC Basic Drive FC 101 Design Guide

Figure 2.7 Energy
m
3
/
h
Distri-
bution
Valve regulation Adjustable
frequency drive
control
% Hours Power Consump-
tion
Power Consump-
tion
A
1
- B
1
kWh A
1
- C
1
kWh
350 5 438 42.5 18.615 42.5 18.615
300 15 1314 38.5 50.589 29.0 38.106
250 20 1752 35.0 61.320 18.5 32.412
200 20 1752 31.5 55.188 11.5 20.148
150 20 1752 28.0 49.056 6.5 11.388
100 20 1752 23.0 40.296 3.5 6.132
Σ
100 8760 275.064 26.801
Table 2.4 Result
2.6.6
Better Control
If an adjustable frequency drive is used for controlling the
flow or pressure of a system, improved control is obtained.
An adjustable frequency drive can vary the speed of the
fan or pump, obtaining variable control of flow and
pressure.
Furthermore, an adjustable frequency drive can quickly
adapt the speed of the fan or pump to new flow or
pressure conditions in the system.
Simple control of process (flow, level or pressure) utilizing
the built-in PI control.
2.6.7
Star/Delta Starter or Soft Starter not
Required
When larger motors are started, it is necessary in many
countries to use equipment that limits the start-up current.
In more traditional systems, a star/delta starter or soft
starter is widely used. Such motor starters are not required
if an adjustable frequency drive is used.
As illustrated in Figure 2.8, an adjustable frequency drive
does not consume more than rated current.
Full load
% Full load current
& speed
500
100
0
0 12,5 25 37,5 50Hz
200
300
400
600
700
800
4
3
2
1
175HA227.10
Figure 2.8 Start-up Current
1
VLT
®
HVAC Basic Drive FC 101
2 Star/delta starter
3 Soft-starter
4 Start directly on line power
Table 2.5 Legend to Figure 2.8
Product Overview
Design Guide
MG18C522 Danfoss A/S © Rev. 2014-01-14 All rights reserved. 15
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Danfoss VLT HVAC Basic Drive FC 101 Specifications

General

Brand	Danfoss
Model	VLT HVAC Basic Drive FC 101
Category	DC Drives
Language	English