Danfoss MCO 305 Design Manual page 183

MCO 305 Design Guide
MCO Basics Settings
32-0* Encoder 2 - Slave
32-3* Encoder 1 – Master
32-5* Feedback Source
32-6* PID controller
32-8* Velocity & Acceleration
32-0* Encoder 2 - Slave
Following parameters configures the interface for
the Encoder 2:
32-00 Incremental Signal Type
ENCODERTYPE
Option
None
RS422 (TTL/line driver)
Sinusoidal 1Vpp
Function
Specifies type of the incremental encoder connec-
ted to Encoder 2 interface (X55).
Select None [0] if no incremental encoder is con-
nected.
Select RS422 (TTL/Line driver) [1] if a digital
incremental encoder with an interface according to
RS422 is connected.
Select Sinusoidal 1Vpp [2] if an analog incremental
encoder with 1 V peak-peak signal is connected.
32-01 Incremental Resolution
ENCODER
Range [Unit]
1 – MLONG [PPR]
Function
The encoder resolution is used to calculate velocity
in RPM (rounds per minute) as well as timeout for
detection of the zero pulse in connection with
HOME and INDEX.
Set the resolution of the incremental encoder con-
nected to Encoder 2 interface (X55):
Digital incremental encoder (32-00 = [1]): The
resolution must be set in Pulses Per Revolution.
default setting
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__ Parameter Reference __
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[0]
[1]
[2]
1024
[ ] value for use in communication via serial communication port
®
MG.33.L4.02 – VLT is a registered Danfoss trademark
Analog incremental encoder (32-00 = [2]): The
resolution must be set in sinusoidal signal
periods per revolution.
Encoder resolution can be found on encoder name-
plate or datasheet.
Note: Maximum frequency of the encoder signal
must not exceed 410 kHz.
Note: Parameter only visible when par. 32-00
32-02 Absolute Protocol
ENCODERABSTYPE
Option
None
SSI
SSI with filter
Function
Specifies type of the absolute encoder connected to
Encoder 2 interface (X55).
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.
A leap in the position data is detected if it is larger
than the encoder resolution/2. The correction is
made by means of an artificial position value which
is calculated from the last velocity. If the error
continues for more than 100 read-outs (> 100 ms),
there will be no further correction which will then
indeed lead to a "position error" (error 108).
The total number of errors will be saved in an
internal variable which can be read out via
SYSVAR[16].
NB!:
The following commands cannot be used
with absolute encoders:
DEF ORIGIN, HOME, INDEX, IPOS, and
WAITNDX.
0
[0]
[4]
[5]