Danfoss MCO 305 Design Manual page 187

MCO 305 Design Guide
32-32 Absolute Protocol
MENCODERABSTYPE
Option
None
SSI
SSI with filter
Function
Specifies type of the absolute encoder connected to
Encoder 1 interface (X56).
Select None [0] if no absolute encoder is
connected.
Select SSI [4] if an absolute encoder with SSI
interface is connected.
Select SSI with filter [5] if an absolute encoder
with SSI interface is connected and the communi-
cation/signal is unstable.
Virtual master: It is possible to simulate a master
by means of APOSS command with the encoder
type [5], for example when the master position is
read via the bus. The simulated master positions
are set and read with the system variable
SYSVAR[4105].
NB!:
The MIPOS command can not be used
with absolute encoder.
32-33 Absolute Resolution
MENCODERABSRES
Range [Unit]
1 – MLONG [PPR]
Function
Note: Parameter only visible when par. 32-32
32-35 Absolute Encoder Data Length
MENCODERDATLEN
Range [Unit]
8 – 37 [Bit]
Function
Specify the number of data bit's for the connected
absolute encoder, see encoder data sheet. This is
required for MCO 305 to generate the correct
number of clock bit's.
Note: Parameter only visible when par. 32-32
default setting
__ Parameter Reference __
[0]
[4]
[5]
8192
0
25
0
[ ] value for use in communication via serial communication port
®
MG.33.L4.02 – VLT is a registered Danfoss trademark
32-36 Absolute Encoder Clock Frequency
MENCODERFREQ
Range [Unit]
78.125 – 2000.000 [kHz]
Function
Specifies the frequency of the absolute encoder
clock signal generated by MCO 305. Set a fre-
quency appropriate for the connected encoder.
Note: Parameter only visible when par. 32-32
32-37 Absolute Encoder Clock Generation
MENCODERCLOCK
Option
Off
On
Function
Select whether encoder 1 shall generate an
absolute encoder clock signal or not.
Select Off [0] if more MCO 305's are connected to
the same absolute encoder or if it is connected to
another MCO 305 where the absolute virtual
master is active. Only one device (MCO 305) is
allowed to generate the clock signal and only one
device (encoder or MCO 305) is allowed to gene-
rate the data signal when multiple MCO 305's are
interconnected.
Select On [1] if the MCO 305 is connected to just
one absolute encoder.
Note: Parameter only visible when par. 32-32
32-38 Absolute Encoder Cable Length
MENCODERDELAY
Option
0 – 300 m
Function
The absolute encoder (SSI) clock and data signals
will be out of synchronization if the signal delay
caused by the encoder cable is too long. MCO 305
is automatically compensating the cable delay
when the cable length is known. The cable delay
compensation is based on a cable delay of approxi-
-9
mately 6 ns (6 * 10 seconds) per meter.
Specify the total cable length (in meters) between
MCO 305 and the absolute encoder.
Note: Parameter only visible when par. 32-32
262.000
0
[0]
[1]
0
0
0
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