Emerson unidrive sp - Page 285

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x.00
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Menus 15 to 17
SM-Encoder Pl
Unidrive SP Advanced User Guide 285
Issue Number: 10 www.controltechniques.com
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
The encoder supply voltage for this Solutions Module is defined by this parameter as 0(5V), 1(8V), or 2(15V).
The following encoders can be connected to the SM-Encoder Plus.
0, Ab: Quadrature incremental encoder, with or without marker pulse
1, Fd: Incremental encoder with frequency and direction outputs, with or without marker pulse
2, Fr: Incremental encoder with forward and reverse outputs, with or without marker pulse
The terminations may be enabled/disabled by this parameter as follows:
x.07 Marker position reset disable
RW Bit US
Ú
OFF (0) or On (1)
Ö
OFF (0)
Update rate: Background read
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
0
Update rate: Background read
x.15 Encoder type
RW Uni US
Ú
Ab (0), Fd (1), Fr (2)
Ö
Ab (0)
Update rate: 4ms x number of dumb modules
x.16 Encoder termination
RW Txt US
Ú
0 to 2
Ö
1
Update rate: Background read
Encoder input x.16=0 x.16=1 x.16=2
A-A\ Disabled Enabled Enabled
B-B\ Disabled Enabled Enabled
Z-Z\ Disabled Disabled Enabled