Hamilton Spectrograph

This section contains descriptions of the electronics version 2 of the Hamilton Spectrograph.

4-Channel Chassis Wiring, EL-4004

Schematic: schematics/HAM_II_box_2_wiring_sh_1.pdf
Page last updated: June 30, 2010

Photos

Front	Rear	AC wiring	Stage wiring
Galil	Power supplies and 5V terminal strip	Fan terminal strip

The above photos show various views of the 4-channel Hamilton Spectrograph controller chassis. These all were taken before top and bottom covers were added and are meant to show interior components, wiring, and terminal strips

Fig. 1 Simplified Diagram

Figure 1 above shows that the main interconnect wiring in the controller consists of power supply wiring, encoder wiring from Jx1, external driver signals from J1, and general I/O from J2. Note that each axis has an encoder connector but that all axes share J1 and all share J2.
The only wiring to the encoder connectors are pins 1 - INDEX+, 5 - GND, and 15 - +5V. Currently, only the Grating Tilt, and Slit stages have the INDEX+ signals wired at the stage. In these two cases there is a slotted disk attached to the motor shaft. In the earlier version of the electronics, a optical slotted vane switch was used which required the software to turn on the emitter side of the switch and then look for the appropriate change of input level to zero the stage. In the newer controller the Hall-effect switches remove the necessity of turning on the emitter. The software will now perform a homing operation to get the "rough" position and then perform a slow speed find index operation to achieve the same one-step positioning as the original system.
The signals from J1 include the Motor Enable, Step, and Direction signals for each axis. These signals run to pins E, F, and G respectively. These signals are wired to the corresponding inputs of the Applied Motion ST5-S drivers located in each stage's EL-4006 driver box.
The signals wired to J2, the general I/O connector, include HOME, FWD_LIM, REV_LIM, and ERROR. The home and limits signals are wired through the driver box and out to the respective sensors. The ERROR signal originates on the Applied Motion driver and comes back to to digital inputs 1, 2, 3, or 4 depending on the axis. The ST5-S asserts the ERROR signal when it detects a problem. If the signal is asserted, the technician should check the status LEDs to determine the problem. Please refer to the EL-4006 write-up to troubleshoot driver problems.

Sheet 2

schematics/HAM_II_box_2_wiring_sh_2.pdf

Sheet 3

schematics/HAM_II_box_2_wiring_sh_3.pdf

Sheet 4

schematics/HAM_II_box_2_wiring_sh_4.pdf

Sheet 5

schematics/HAM_II_box_2_wiring_sh_5.pdf

FIG. 2 - TB1 +24V power wiring		Fig. 3 - TB2 +5V isolated power wiring

Sheet 6

schematics/HAM_II_box_2_wiring_sh_6.pdf

Fig. 4 One line drawing

Figure 4, the 'One Line Drawing' is provided for a quick overview of wiring inside the chassis.