Declination Axis

Table 3.5: Declination Axis Specification

Drawing:	RCT001/Dec
EOS Drawing:
Dec Drive Amplifer:	Amp 3
Preload DriveAmplifer:	Amp_4
Controller:	PMAC #3
Controller:	PMAX #4
Limits:	$-47 - +90$ usable $-48 - +91$ safe max avoids cable
Max speed:	1 deg/sec eventually 3?
Max accel:	0.1 deg/sec/sec eventually 0.5?
Position encoder:	Heidenhain RON 806 with EXE660 expander
Scale:	160,000 counts per degree increases north.
Homes:	towards +32 degs with HA near 0H
Note:	floor must be down.
Gear:	360 tooth
Preload encoder:	3600 line BEI

See Hour Angle for more details and Section 5.1.17 for details of the Declination Axis control software. Figure 3.12 is a photo of the Encoder.

Figure 3.12: A view of the Encoder and Limit Switches.