Control Techniques SM-Encoder Output Plus, Руководство пользователя

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SM-Encoder Plus & SM-Encoder Output Plus User Guide
www.controltechniques.com Issue: 4
An incremental digital encoder may have a marker channel and when this channel
becomes active (rising edge in the forward direction and falling edge in reverse) it may
be used to reset the encoder position and set the marker flag (Pr
x.07 = 0), or just to set
the marker flag (Pr x.07 = 1). When the position is reset by the marker, Pr x.05 is reset
to zero.
The marker flag is set each time the marker input becomes active, but it is not reset by
the drive, and so this must be done by the user.
When Ab, Fd, or Fr signals are used the equivalent number of encoder lines per
revolution must be set-up correctly in Pr
x.10 to give the correct speed and position
feedback. The equivalent number of encoder lines per revolution (ELPR) is defined as
follows:
Although Pr x.10 can be set to any value from 0 to 50,000, there are restrictions on the
values actually used as follows:
If Pr
x.10 < 2, ELPR = 2. If Pr x.10 > 16,384, ELPR = 16,384. Otherwise, Pr x.10 is
rounded down to the nearest value that is a power of 2, e.g. if 5,000 is set in Pr x.10 , the
drive actually uses 4,096.
SM-Encoder Output Plus only
The encoder supply voltage for the SM-Encoder Output Plus module is defined by this
parameter as 0(5V), 1(8V), or 2(15V).
x.08 Marker flag
RW Bit NC
Ú
OFF (0) or On (1)
Ö
OFF (0)
Update rate: 4ms x number of dumb modules
x.10 Equivalent lines per revolution
RW Uni US
Ú
0 to 50,000
Ö
4,096
Update rate: Background read (only has any effect when the drive is
disabled)
Position feedback device ELPR
Ab number of lines per revolution
Fd, Fr number of lines per revolution / 2
x.13 Encoder supply voltage
RW Uni US
Ú 0 to 2 Ö
0
Update rate: Background read