Model SPS16M
Magnetically coupled - Shaft Position Sender.
Description
The sender is designed to smoothly report the position of a motor shaft
to standard industrial control electronics using the very common
4 to 20 mA current loop. Fractional positions between open
and closed result in a proportional output current between
4 and 20 mA. Overrun positions
outside the open and closed result in a
fixed current of 4 or 20 mA, as appropriate. By careful design,
this precision sender requires no batteries or external power supply
since it draws its operating current from the signal loop. Calibration
and the shaft position data are saved in non volatile memory. That
is, generally when power is lost, information remains safe. Should
power
be lost while the sender is rotating, information may be lost, requiring
recalibration. However, for the usual application, as a door or
window position indicator, loss of power while moving is a low risk,
low error event. Two optional optocoupled inputs are provided for
connection to 24 Volt AC/ DC limit switches, which greatly simplify
and can even automate the calibration process. The current loop
connections are not polarised facilitating the connection to unlabelled
loop wires.
Characteristics
- Manual or Automatic learning
- Maximum shaft revolutions, including any overruns beyond open
and closed is 4096
- Resolution of a revolution is 16 positions
- Maximum resolution of output is a approximately 250 steps of
0. 064 mA
- Maximum shaft speed is 600 RPM
- Coupling is 4 pole magnetic, through the sealed plastic enclosure
- Maximum allowable loop voltage drop through sender at 4 mA is 28 VDC
- Minimum dropout voltage through sender at 20 mA is 12 VDC
- Loop Current is 4 to 20 mA ±0. 5 mA
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