Programming Your Application 1-33
690+ Series Frequency Inverter
ENCODER SPEED
Designed for use with the System Board option, all Motor Control Modes.
This block allows Speed Feedback to be measured using a quadrature encoder when the System
Board option is fitted.
Functional Description
A quadrature encoder uses 2 input signals (A and B), phase
shifted by a quarter of a cycle (90°). Direction is obtained by
looking at the combined state of A and B.
Speed is calculated using the following function:
SPEED HZ = filter
CountsPerSecond
Lines x 4
, FilterTime
where counts per second are the number of edges received from the encoder. There are 4 counts
per line.
MMI Menu Map
1
SETUP
2
SYSTEM BOARD
3
ENCODER SPEED
SOURCE
LINES
INVERT
MAX SPEED
FILTER TIME
SPEED HZ
SPEED
Encoder Speed 1
–
SPEED HZ [1538]
–
0.0 Hz
–
SPEED [1539]
–
0.0 %
MASTER
ENCODER
–
[1532] SOURCE
–
2048
–
[1533] LINES
–
FALSE
–
[1534] INVERT
–
1500 rpm
–
[1535] MAX SPEED
–
0.50 s
–
[1537] FILTER TIME
–
Encoder Speed 2
–
SPEED HZ [1546]
–
0.0 Hz
–
SPEED [1547]
–
0.0 %
MASTER
ENCODER
–
[1540] SOURCE
–
2048
–
[1541] LINES
–
FALSE
–
[1542] INVERT
–
1500 rpm
–
[1543] MAX SPEED
–
0.50 s
–
[1545] FILTER TIME
–
Parameter Descriptions
SOURCE
Range: See below
Determines the encoder channel from which the speed is calculated.
Enumerated Value : Source
0 : MASTER ENCODER
1 : SLAVE ENCODER
LINES
Range: 1 to 32767
The number of lines must be set to match the type of encoder being used. Incorrect setting of
this parameter will result in an erroneous speed measurement.
INVERT
Range: FALSE/TRUE
When TRUE, changes the sign of the measured speed and the direction of the position count.
MAX SPEED
Range: 0 to 32000 rpm
Sets the 100 % value in RPM. Refer to SPEED below.
FILTER TIME
Range: 0.00 to 300.00 s
Filter time constant for SPEED HZ and SPEED % outputs. Setting to zero will remove the
filter.
SPEED Hz
Range: —. Hz
Speed Feedback in Hertz (revolutions per second).
SPEED
Range: —.x %
SPEED % =
SPEED Hz x 60
MAX SPEED
x 100
A
B
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