Group C SVT test setup

Chiller

Polyscience 6506T

• Product page: http://www.polyscience.com/en/p110t78/6500-series-chiller--1-2-hp-turbine-pump.php
• Manual: http://www.polyscience.com/_pdf/_manual/_recirculating-chillers/110-240.pdf)

Internal pressure bypass set to 40 psig

Interlock board

Arduino Leonardo (http://arduino.cc/en/Main/ArduinoBoardLeonardo)

Source code: serial.ino

Need micro-USB cable to reprogram. Software is already installed on Windows laptop.

Inputs:

• HTM2500LF temperature+humidity sensor inside Lexan box
• Flow switch in cooling system return line
• RS-232 connection to chiller - status, set T, measured pressure/flow/T

Thresholds:

• Ambient T inside SVT Lexan box < 25 C (set in Arduino script)
• Ambient RH inside SVT Lexan box < 5 % (set in Arduino script)
• Cooling system flow > 20 GPH (adjustment screw on flow switch)

Logic:

• Check inputs every 1 s; if any input is abnormal, trip and stay tripped (must reset Arduino board to clear)

Outputs:

• RS-232 to chiller: if tripped, send "stop" command every 1 s
• Interlock to CAEN crate (5V normal, 0V tripped) - trip turns off all outputs immediately
• Prints inputs to USB serial connection every second (if plugged in)