4 Description
The encoder box is intended to be used in an environment
where several servo drives require an exact position in
order to follow a specific curve profile, or to determine the
speed at which the machine is running. The position can
be read either from an externally connected encoder or
from a software encoder simulation running on the
encoder box.
•
The encoder box reads the position values from
an absolute or incremental encoder, applies a
precise timestamp and sends them periodically to
the CAN.
•
DS301 and DS406 of the CAN-CiA-Standard are
implemented in the encoder box.
•
The object dictionary is detailed in the
VLT
®
ISD 410 Design Guide
.
•
The encoder box fulfils the requirements of class
2 encoders according to the DS406 CAN standard.
•
When simulating the encoder the speed and
ramp can be set.
•
If an error or unexpected event occurs the
encoder box transmits an emergency message
(error code).
•
Every error is logged in the encoder box memory
and remains in the error history. However a
maximum of 6 errors and 6 warnings are saved
and older events are overwritten (first-in-first-out
principle).
4.1 Supported Encoders
Encoder
Description
SSI
All single-turn SSI encoders are compatible up to
28 bit.
SSI-CRC
All single-turn SSI-CRC encoders are compatible up
to 28 bit.
The CRC Polynomial is fixed and the CRC-Check can
be enabled or disabled.
QEP
All QEP encoders are compatible up to 24 bit.
BiSS
All single-turn BiSS encoders are compatible up to
32 bit.
The CRC polynomial can be parameterised.
Table 4.1 Supported Encoders
4.2 ISD Encoder Box Display
The display shows the operating status of the encoder box.
130BD085.10
Run/Err
Power
CAN I
Warn
Err
0
CAN-ID
CAN II
RS232
Service
Set
2
8
6
4
ISD
Encoder Box
Illustration 4.1 Encoder Box Display
See chapter
for detailed information
on the display.
Description
VLT
®
ISD Encoder Box Operating Instructions
MG75F102 - VLT
®
is a registered Danfoss trademark
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