MPOD Interlock(MPODI) Board Test

MPODI board schematic

The function of MPOD Interlock board is turning MPOD off when 2 chillers stop working to avoid possible damage due to high temperature. When at least one chiller is working well, all channels of MPOD can be switched on remotely by software. When 2 chillers stop working, all channels of MPOD will be switched off with their specific down ramp
Here is schematic of 1st version MPODI board.MPODI_schematic_v1.pdf The second version of MPODI board will be produced soon.
MPODI explain.png
MPODI explain

MPODI board connectors and pin assignment

MPODI connects to MPOD Interlock connector via DB9 connectors. There are 3 MPOD connected to MPODI board at the same time. The spare DB9 connector is backup. MPODI connects to Chiller PLC via LEMO connector. TIM board provide 6V power supply to MPODI board. There is a LEMO connector for monitoring.
MPODI connectors.png
MPODI explain
MPOD and MPODI board connect via DB9 connectors. Here is the pinout of J2, J4, J6, J7.
PIN number Function
pin1 Control signal from MPODI (5V/0V)
pin5 GND
pin9 TTL high from MPOD (5V)

MPODI board sends TTL high signal to Chiller PLC board, then Chiller PLC board sends chiller working states signal to MPODI board. When the chiller is working well, chiller PLC board sends TTL high signal to MPODI board. When 2 chillers stop working, chiller PLC sends 0V signal to MPODI board. Here is the pinout of J3
If we have no chiller PLC, for now, we could fake chiller states signal.

PIN number Function
pin1 TTL high signal from MPODI (5V)
pin2 Chiller states signal (0V/5V)

TIM board sends power to MPODI board. Since the current from MPOD DB9 is not enough, we have to connect TIM to MPODI to provide current. Here is the pinout of J1.

PIN number Function
pin1 +6V from TIM board
pin2 0V

We could monitor chiller states via LEMO connector J5. Here is the pinout of J5.

PIN number Function
pin1 Chiller states signal (5V/0V)
pin2 GND

MPOD Interlock board test

1. We use TIM v4 power supply cable and TIM splitter cable for MPODI basic function test. Since we don’t have chiller PLC, for now, we will fake signal from chiller PLC. According to the MPOD manual, the pin9 output current is 25mV. Because running MPODI board need around 100mV, we use TIM board to provide 5V power to MPODI board.
Connect cables according to picture1 and test voltage between pin1& pin2 on J5. When chillers stop working, chiller states signal should be 0V.
MPODI test1.png
MPODI test
2. Then we fake a “chillers work well” signal. Connect cables according to picture 2. Connect pin1 and pin2 of J3 using TIM PS cable, and measure the voltage between pin1 and pin2 of J5. Chiller states signal should be 5V.
MPODI test2.png
MPODI test

-- DiWang - 2020-06-27

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf LC_SCHEMATIC___v1_.pdf r1 manage 82.6 K 2020-06-27 - 14:18 DiWang  
PNGpng MPODI_connectors.png r1 manage 18.7 K 2020-06-27 - 14:35 DiWang  
PNGpng MPODI_explain.png r1 manage 181.6 K 2020-06-27 - 14:19 DiWang  
PNGpng MPODI_logic.png r1 manage 35.2 K 2020-06-27 - 14:19 DiWang  
PNGpng MPODI_test1.png r1 manage 272.8 K 2020-06-27 - 15:14 DiWang  
PNGpng MPODI_test2.png r1 manage 268.1 K 2020-06-27 - 15:14 DiWang  
PDFpdf mpodi-20200715-v2.pdf r1 manage 83.5 K 2020-09-17 - 14:17 DiWang  
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Topic revision: r4 - 2020-09-17 - DiWang
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