Danfoss VLT Programming Guide

This shows a typical Air Handling Unit (AHU). As can be seen, the addition of the Analog I/O option offers the possibility to control all of the functions
from the frequency converter, such as inlet-, return- and exhaust dampers or heating/cooling coils with temperature and pressure measurements being
read by the frequency converter.
NB!
The maximum current for the analog outputs 0-10V is 1mA.
NB!
Where Live Zero Monitoring is used, it is important that any analog inputs not being used for the frequency controller, i.e. being used
as part of the Building Management System decentral I/O, should have their Live Zero function disabled.
Terminal Parameters Terminal Parameters Terminal Parameters
Analog inputs Analog inputs Relays
X42/1 Par. 26-00 Terminal
X42/1 Mode
, 26-1*
53 6-1* Relay 1 Term 1, 2, 3 5-4*
X42/3 Par. 26-01 Terminal
X42/3 Mode
, 26-2*
54 6-2* Relay 2 Term 4, 5, 6 5-4*
X42/5 Par. 26-02
Terminal
X42/5 Mode
, 26-3*
Analog outputs Analog output
X42/7 26-4* 42 6-5*
X42/9 26-5*
X42/11 26-6*
Table 3.3: Relevant parameters
It is also possible to read the analog inputs, write to the analog outputs and control the relays, using communication via the serial bus. In this instance,
these are the relevant parameters.
3 Parameter Description VLT
®
HVAC Drive Programming Guide
254 MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT Specifications

General

Frequency	50/60 Hz
Enclosure	IP20, IP21, IP55, IP66
Series	VLT
Control Technique	Flux Vector Control
Output Voltage	0-Vinput
Control Method	Fieldbus
Communication Interface	PROFIBUS, CANopen
Protection Features	Overload, Overvoltage, Undervoltage, Short Circuit, Ground Fault
Cooling Method	Liquid Cooled
Storage Temperature	-25°C to +70°C
Relative Humidity	5-95% non-condensing
Altitude	Up to 1000m (3280ft) without derating, up to 4000m (13120ft) with derating
Operating Temperature	-10°C to +50°C (14°F to 122°F)