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- The Wiring diagram: Motor controlling box.PDF
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Operating the microwave system
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The microwave VI automatically controls the motor position to maintain the EIP frequency at 140.18 GHz. Make sure the "Track EIP" is on.
Polarization
Turning on the system
- Turn on the microwave chiller near the NM3 area
- Turn on the microwave interlock box in the slow controls rack. After about one minute, the value displayed on the “Gem sensor “of the interlock box should be greater than 0.10r.
- If not, do not proceed and contact the target expert.
- Turn on the “Varian” power supply in the slow controls rack.
- Initially, the power supply will on the “Filament delay” state for about 2 minutes
- After two minutes the power supply will be changed the state to “Standby”. Now the power supply is ready.
- If the power supply goes to the “Summary fault” state, contact the target expert
- Change the power supply mode from Local to Remort by pressing the button as in the picture below
- Turn on the EIP frequency counter in the slow controls rack and press 7 3 7 numeric buttons. This will select the correct frequency band
- Turn the power supply controller in the control room rack and set the mode to Local. Make sure the power supply is in the Standby mode
- Now the power supply is ready to transmit the microwave to the target cups.
Restoring the microwave system from fault conditions
Whenever there is a loss of microwave frequency, you will hear a continuous warning sound from the microwave computer.
You As in the image below, you will see a blinking "Lost EIP signal!!!μ-wave temperature issue" warning on the microwave VI as in the image below
There are three instances where you can hear this warning
- Case 1 : "Lost EIP signal!!!" on the VI. But EIP on the camera shows frequency numbers
Action needed: Stop the VI by pressing "Stop VI". Restart the VI by pressing the "Run" button
- Case 2: "Lost EIP signal!!!" on the VI. EIP on the camera is not showing frequency numbers. There is no fault warning on the microwave power supply in the control room rack.
Action needed: Slightly change the motor position until you see the EIP signal
- Enter 1 degree in the VI and press the right arrow to move the motor by 1 degree. Keep pressing until you see a signal. If it is not showing anything after 5 presses, change the value to 5 degrees and repeat. If it is not successful, enter 10 degrees and try.
- Case 3: "Lost EIP signal!!!" on the VI. EIP on the camera is not showing frequency numbers. The microwave power supply in the control room rack is in a faulty condition.
Action needed:
- Reset the power supply fault state
- Press the left button to switch to standby mode. Press it again to Transmit. This will reset the fault.
If not, try following
- Press the left button to switch to standby mode. Press the right button two times (The ode will change from Local → Remort→ Local). Press the left button to switch to Transmit
If not, try following
- Powercycle the microwave power supply in the slow controls rack using the red toggle switch and Change the mode to Remort. Change the mode to Remort. Press the left button to switch to Transmit
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. This happens when the "wave guide temp" drops below the threshold level.
Steps to follow
- Check the front panel of the microwave power supply controller in the control room rack. If it is in fault mode, you will see red warning lights on the front panel.
- If it is not in fault mode, proceed directly to step d.
- Press the, transmit/standby button two times around one-second intervals. It will clear the warning and start the microwave transmission.
- If the warning comes back right at the same time, do not proceed; call the target expert.
- In a few seconds, you will see the red line (waveguide temp) in the EIO temperature plot rising. At the same time, the EIP frequency may appear (This is not essential). It will take less than 15 seconds to clear the warning sound and the alerts on the VI. Now the system is back again. No need to perform further steps.
- If the temperature does not come back, follow the step d.
- Change the Set position (rev) value to 1.75 and press enter
- Monitor the waveguide temperature on the EIO temperature plot. If there is a temperature increase OR if you observe numbers on the EIP Frequency (GHz), press STOP MOTOR
- If this action is unsuccessful, change the Set position (rev) value to 2 and repeat step e.
If the issue persists, press the transmit/standby button once on the power supply to switch the mode to standby. Then, call the target expert.
- Check the front panel of the microwave power supply controller in the control room rack. If it is in fault mode, you will see red warning lights on the front panel.