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Table of Contents:
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Page Status
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Date
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Initials
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Change
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May 19, 2021
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SG
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Introduction
The agitator consists of a motor with a rotating reel that taps against hanging loops of fiber. This continually changes the paths of the light rays through the fibers, thereby smoothing/homogenizing the output illumination of the fibers.
The motor is controlled by a Galil DMC-30012 controller.
Two temperature sensors are also connected to the Galil controller - one to measure the temperature of the motor, and one to measure the air temperature within the crypt.
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Relevant Devices
Description | Qty | Source | Part Number |
|---|---|---|---|
Motor Controller | 1 | Galil | DMC-30012-BOX (ISCNTL) |
Motor and Encoder | 1 | Galil | BLM-N23-50-1000-B |
Power Supplies1 | 2 | Galil | PS-2.50-24 |
Power Cable | 1 | Galil | PWRCBL-30012-ISCNTL |
Emergency Stop Switch | 1 | Rockler.com | Safety Power Tool Switch |
Temperature Sensor | 2 | Analog Devices | AD592BNZ |
1: the option was chosen to use two power supplies: one powers the controller and one powers the motor.
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Relevant Functional Block
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Diagrams
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Software Actions
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Action
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Notes
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Turn on motor
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Will occur just before start of spectrometer exposure.
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Turn off motor
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Will occur during readout of spectrometer exposure.
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Operational Modes
Link to Agitator tab within Operational Modes Spreadsheet
Required Adjustable Settings
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Setting
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When Needed
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Notes
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Build
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Observing
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Maintenance
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Motor speed
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YES
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NO
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MAYBE
Required Telemetry
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Parameter
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Report Frequency
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Purpose
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Notes
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Motor RPM
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once per minute (TBC)
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Ensures agitator is running properly
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When the encoder is mounted on the motor, it rotates in the same direction as the motor.
In the final design of the agitator, the encoder will be removed from the motor. It will be installed on a separate shaft that will rotate in the opposite direction of the motor.
Noted here as the Galil-related software might need to address this internally.
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Motor current
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once per minute (TBC)
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Ensures agitator is running properly
Higher motor current could indicate wear or snags
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Suggestion from Galil (email to SG):
“You can monitor the commanded current via the Tell Torque command (TT). This monitors the commanded torque or motor command signal that we are sending to the amplifier. This signal is a -10V to +10V signal. Using this with the amplifier gain (AG command) you can find what the command current is.
For example, if TTA = 2V and AGA=1 (corresponding to 0.8A/V), the commanded current to the motor is 1.6A (TT*AG or 2*0.8). Please take a look at the TT and AG commands in the controller command reference for more details.”
Required Alarms
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Parameter
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Threshold
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Notes
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Motor RPM low
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TBD
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Motor current high
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Agitator Temperature Sensors
Note: the Agitator temperature sensors are reporting values that are about 2x the actual temperature. As of June 2023, we have not yet determined the cause of this.
Temperature Sensor Wiring Diagram:
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Temperature Sensor Details:
Topic | Description | Notes |
|---|---|---|
Diagram of the measurement circuit used for the temperature sensors. | 
V = I*R
| Originally from Dale Sandford (UCO). |
Galil ADC calculations for the AD592 temperature sensors. | 12 bit over 5V = 0.001 V per ADU; | Based on values within datasheet below. |
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Pictures of Devices
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Relevant Datasheets & Manuals
Description | File | Source | |||||
|---|---|---|---|---|---|---|---|
| 1 | Galil DMC-3x01x Datasheet |
| http://www.galilmc.com/motion-controllers/single-axis/dmc-3x01x#info=0 | ||||
| 2 | Temperature SensorsGalil DMC-30000 Manual |
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| 3 | AD592BNZ Temperature Sensor Datasheet |
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