Danfoss VLT Design Guide

7.4 Examples
91
7.4.1 Writing a Parameter Value 91
7.4.2 Reading a Parameter Value 92
7.5 Modbus RTU Overview
92
7.5.1 Assumptions 92
7.5.2 What the User Should Already Know 92
7.5.3 Modbus RTU Overview 92
7.5.4 Frequency Converter with Modbus RTU 93
7.5.5 Frequency Converter with Modbus RTU 93
7.6 Modbus RTU Message Framing Structure
93
7.6.1 Frequency Converter with Modbus RTU 93
7.6.2 Modbus RTU Message Structure 93
7.6.3 Start/Stop Field 94
7.6.4 Address Field 94
7.6.5 Function Field 94
7.6.6 Data Field 94
7.6.7 CRC Check Field 94
7.6.8 Coil Register Addressing 94
7.6.9 How to Control the Frequency Converter 97
7.6.10 Function Codes Supported by Modbus RTU 97
7.6.11 Modbus Exception Codes 97
7.7 How to Access Parameters
97
7.7.1 Parameter Handling 97
7.7.2 Storage of Data 97
7.7.3 IND 98
7.7.4 Text Blocks 98
7.7.5 Conversion Factor 98
7.7.6 Parameter Values 98
7.8 Examples
98
7.8.2 Force/Write Single Coil (05 HEX) 98
7.8.3 Force/Write Multiple Coils (0F HEX) 99
7.8.4 Read Holding Registers (03 HEX) 99
7.8.5 Preset Single Register (06 HEX) 100
7.8.6 Preset Multiple Registers (10 HEX) 100
7.9 FC Control Profile
101
8 General Specifications and Troubleshooting
105
8.1 General Specifications
105
8.2 Efficiency
117
8.5 Special Conditions
122
8.6 Alarm and Status Messages
123
Contents
VLT
®
Refrigeration Drive Design Guide
MG16G102 - 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)