Danfoss VLT HVAC Design Guide

7.4.11 Data Types Supported by the Frequency Converter
Data types Description
3 Integer 16
4Integer 32
5 Unsigned 8
6 Unsigned 16
7 Unsigned 32
9Text string
10 Byte string
13 Time difference
33 Reserved
35 Bit sequence
Unsigned means that there is no operational sign in the telegram.
7.4.12 Conversion
The various attributes of each parameter are displayed in the section
Factory Settings. Parameter values are transferred as whole numbers
only. Conversion factors are therefore used to transfer decimals.
Par. 4-12
Motor Speed Low Limit [Hz] has a conversion factor of 0.1.
To preset the minimum frequency to 10 Hz, transfer the value 100. A
conversion factor of 0.1 means that the value transferred is multiplied by
0.1. The value 100 is thus perceived as 10.0.
Conversion table
Conversion index Conversion factor
74 0.1
2 100
110
0 1
-1 0.1
-2 0.01
-3 0.001
-4 0.0001
-5 0.00001
7.4.13 Process Words (PCD)
The block of process words is divided into two blocks of 16 bits, which always occur in the defined sequence.
PCD 1
PCD 2
Control telegram (master⇒slave Control word) Reference-value
Control telegram (slave ⇒master) Status word Present outp. frequency
7 RS-485 Installation and Set-up VLT
®
HVAC Drive Design Guide
136 MG.11.B9.02 - VLT
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Danfoss VLT HVAC Specifications

General

Enclosure Rating	IP20, IP21, IP54, IP55, IP66
Storage Temperature Range	-25°C to +70°C
Output Voltage Range	0-100% of supply voltage
Communication Protocols	Modbus RTU, BACnet, Ethernet/IP, Profibus DP
Ambient Temperature Range	-10°C to +50°C (without derating)
Relative Humidity	5% to 95% non-condensing
Altitude	Up to 1000 m without derating
Cooling Method	Air cooled
Application	HVAC systems, Pumps, Fans, Compressors
Voltage Range	200-240 V, 380-500 V, 525-600 V
Frequency Range	0 Hz to 590 Hz