Danfoss VLT series Programming Guide

Sub-index 03: External encoder align bits
Some encoders have ll bits in the data that is transmitted to the servo drive. These ll bits are often used to have the
same length of transmit data among encoders with dierent resolutions. Use the encoder manual to nd out if there are
any ll bits.
Sub-index 04: External encoder ag bits
Most encoders provide additional error signaling bits in the data that is transmitted to the servo drive. The servo transitions
to error state when at least 1 of these bits is not 0. Use the encoder manual to nd out if there are any error bits.
Sub-index 05: External encoder clock freq mHz
Some encoder types need a clock from the master, for example SSI from 0.1 MHz up to 2 MHz or BiSS up to 10 MHz.
Consult the encoder manual to nd out which frequencies can be used. The length and parameters of the cable also have
an eect on the maximum usable cable length.
Sub-index 06: External encoder crc polynomial
Currently only used for BiSS encoders. Consult the encoder manual about the polynomial used to calculate the CRC in the
encoder. For example, the Acuro BiSS encoder series from Hengstler uses a value of 67.
Sub-index 07: External encoder gray-encoding
Set this value to 1 when the data from the encoder is gray-coded, otherwise leave it as 0.
Sub-index 08: External encoder type
The following values are supported:
0: No encoder
2: BiSS B
4: SSI
7.21.6.2 Parameter 51-32 and 51-33: External Encoder (0x2011)
This object contains information regarding the external encoder.
Sub-index 1 contains the position of the external encoder. The value of this object represents the guide value from 0–1.
Sub-index 2 contains the speed of the external encoder. The value is given in revolutions per second.
Attribute Value
Index 0x2011
Name External encoder
Object code Array
Sub-index 0x00
Description Value of highest sub-index
Access Const
Data type UNSIGNED8
PDO mapping No
Default value 0x02
Sub-index 0x01
LCP parameter number 51-32
Description External encoder position
Access Read only
Data type UNSIGNED32
PDO mapping Optional
Value range UNSIGNED32
Default value –
Sub-index 0x02
LCP parameter number 51-33
Description External encoder speed
Access Read only
Data type FLOAT
Servo Drive Parameter Descr...
VLT
®
Integrated Servo Drive ISD
®
510 System
342 Danfoss A/S © 01/2017 All rights reserved. MG36D102
77

Danfoss VLT series Specifications

General

Series	VLT
Category	DC Drives
Output Voltage	0-100% of input voltage
Protection Features	Overvoltage, Undervoltage, Overcurrent, Overtemperature, Short Circuit, Ground Fault
Communication Interfaces	Profibus, CANopen
Enclosure Rating	IP20, IP21, IP55, IP66
Cooling Method	Forced Air Cooling, Convection Cooling
Control Mode	Sensorless Vector, Closed Loop Vector
Ambient Temperature	-10°C to +50°C (14°F to 122°F)