Agitator Controller

Table of Contents:

1 Introduction
2 Relevant Devices
3 Relevant Functional Block Diagrams
4 Agitator Temperature Sensors
5 Pictures of Devices
6 Relevant Datasheets & Manuals

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.

Relevant Devices

Description	Qty	Source	Part Number

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.

Relevant Functional Block Diagrams

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:

Temperature Sensor Details:

Topic	Description	Notes

Topic

Description

Notes

Diagram of the measurement circuit used for the temperature sensors.

The AD592 is powered by 12V (supplied by the Galil)
The AD592 outputs 1 micro-Amp / K.
The 10k Ohm resistor converts this amperage change to a voltage change (via Ohm’s law):

V = I*R
0.01 V/K = 1 uA/K * 10^{^4} Ohm.

This voltage change is then sensed by the Galil’s ADC.

Originally from Dale Sandford (UCO).

Galil ADC calculations for the AD592 temperature sensors.

12 bit over 5V = 0.001 V per ADU;
AD592 gives 0.01 V per K;
So measurement resolution is:
0.1 K per ADU (OK for these sensors)

Based on values within datasheet below.

Pictures of Devices

Top view of the Galil controller (located within the top right corner of the Agitator frame)

Side view of Galil controller. The large grey backshell is for the temperature sensors.

The air temperature sensor is at the top of the support frame for the fiber strain relief boxes.

The white cable shown here is for the motor temperature sensor.

Close-up of the motor temperature sensor (secured to the right side of the motor with foil tape).

Relevant Datasheets & Manuals

	Description	File	Source

	Description	File	Source
1	Galil DMC-3x01x Datasheet		http://www.galilmc.com/motion-controllers/single-axis/dmc-3x01x#info=0
2	Galil DMC-30000 Manual
3	AD592BNZ Temperature Sensor Datasheet