Danfoss VLT HVAC Basic Drive FC 101 Design Guide

2.7 Control Structures
2.7.1 Control Principle
1-00 Configuration Mode can be selected if open-loop or closed-loop is to be used.
2.7.2 Control Structure Open-loop
130BB892.10
100%
0%
-100%
100%
Local
reference
scaled to
Hz
Auto mode
Hand mode
LCP Hand on,
off and auto
on keys
Local
Remote
Reference
Ramp
P 4-10
Motor speed
direction
To motor
control
Reference
handling
Remote
reference
P 4-14
Motor speed
high limit [Hz]
P 4-12
Motor speed
low limit [Hz]
P 3-4* Ramp 1
P 3-5* Ramp 2
Figure 2.17 Open-loop Structure
In the configuration shown in Figure 2.17, 1-00 Configuration Mode is set to [0] Open-loop. The resulting reference from the
reference handling system or the local reference is received and fed through the ramp limitation and speed limitation
before being sent to the motor control. The output from the motor control is then limited by the maximum frequency limit.
2.7.3
PM/EC+ Motor Control
The Danfoss EC+ concept provides the possibility for using high efficient PM motors (permanent magnet motors) in IEC
standard frame size operated by Danfoss adjustable frequency drives.
The commissioning procedure is comparable to the existing one for asynchronous (induction) motors by utilizing the
Danfoss VVC
plus
PM control strategy.
Customer advantages:
•
Free choice of motor technology (permanent magnet or induction motor)
•
Installation and operation as known on induction motors
•
Manufacturer independent when selecting system components (e.g., motors)
•
Best system efficiency by selecting best components
•
Possible retrofit of existing installations
•
Power range: 45 kW (200 V), 0.37–90 kW (400 V), 90 kW (600 V) for induction motors and 0.37–22 kW (400 V) for
PM motors
Product Overview
Design Guide
26 Danfoss A/S © Rev. 2014-01-14 All rights reserved. MG18C522
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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