Hour Angle Drive

Drawing: RCT001/1
EOS Drawing:
Motor: "good quality" DC servo with analog tachometer output.
Velocity encoder:BEI 
Motor Encoder: incremental with index
Overall encoder: Heidenhain RON 806 36,000 line count
      EXE 660 exploder connected and
	exploder 400:1
Limits: two-level East and West. 
        -108 to +175 degrees feasable
        -80  to +160 degress because cables
        -78  to +158 safe 
        the normal limits are for channel 1, the FS limits are channel2
HA Controller: PMAC#1
HA Drive Amplifier: Amp 1 Copley (413)
Scale: 160,000 ppdeg.
Home corr: is closed west (light is on) very close to meridian
Home pulse: 6.65 west 
Slew: 1 degree per second  0.1 deg/sec/sec acc.
Gear:  480 tooth

With a 3600 line  encoder this give
Scale: 19200.0 pulses pere degree 

Jan 17,2023: measured change to using the HA axis encoder Measured: 19199.92 ppdeg

These encoders have a failure report. Two-level limits means an inner one that is used by the software and an outer one that does something more drastic.

Hour Angle Preload

Drawing: RCT001/1
EOS Drawing:
Limits: two-level East and West. 
        the normal limits are for channel 1, the FS limits are channel2
HA Preload: PMAC#2
HA Drive Amplifier: Amp 1 Copley (413)
Preload Drive Amplifier: Amp 2
Encoder:  3600 line BEI (14400 pulses/turn)

Software
rtel point command

rtel offset command
rtel preload command

Photos


Device Index