Operation and Maintenance Manual

3.3 Positioner Connectors
The positioner connectors J3 and J5 are circular MS-type connectors which
carry encoder signals, tachometer signals, limit switch signals, and power for
the motors and encoders.
3.3.1 Encoder IN/OUT (J3)
For each encoder, there are 6 wires, in three sets of shielded twisted pairs.
One pair is for the normal (A) pulses, one pair for the quadrature (B) pulses,
and one for the index (I) pulses.
For each axis, there are two wires for a home (zero-indicating) pulse which is
used during the calibration operation to find an absolute reference point.
115/230 VAC is provided as input to a power supply which provides 5 Vdc
power to the encoders.
For each tachometer (azimuth and elevation), there are two wires.
3.3.2 Motor Power and Limits (J5)
Each motor has 6 wires, one group of three connected in parallel for DC
power-high side and the second group of three connected in parallel for DC
return.
For each axis, there are 3 limit switch wires: one for CW limit, one for CCW
limit and one for common. The CW and CCW limits will shut down the
motor amplifiers from moving the motors in the direction which caused the
limit.