Calibration Procedure
Perform the procedure whenever the flywheel interface board or the load cell is replaced.
Note: Bring the RPM of the system to zero. The flywheel should be in shutdown mode. The bus may purge while calibration is being performed.
- Place the key switch (1) in the Bypass position for the MMU that is being calibrated.
Note: In a single module system, place the key switch (1) in the Bypass position on the system cabinet.
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| Illustration 1 | g00839253 |
(1) Key switch | |
- Disable the input voltage to the system by opening the input circuit breaker.
Note: Continuing with step 2 may disable power to the load.
- Connect a PC to the parallel cabinet interface board that is located in the system cabinet.
- Rotate the switch on the parallel cabinet interface board to the corresponding multiple module unit.
Proceed to Step 8.
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| Illustration 2 | g01051091 |
- Disable the input voltage to the system by opening the input circuit breaker.
Note: Step 5 may disable power to the load.
- Remove all sheet metal panels. Remove the sheet metal panel for the system I/O and isolation board (2) .
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| Illustration 3 | g00839256 |
(2) System I/O and isolation board | |
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| Illustration 4 | g00840027 |
(3) Jumper (Jmp 1) | |
- Connect a PC to the system RS232/RS485 port that is located on the system I/O and isolation board. Ensure that jumper Jmp1 (3) on the system I/O and isolation board is in the correct position.
Note: The lower side is RS232 and the higher side is RS485.
- Close the input circuit breaker in order to restore the power to the system.
The system will start but the key will remain in the Bypass position.
- Start the PC.
- Run the UPSView software by double clicking the icon (4) on the PC.
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| Illustration 5 | g00840053 |
(4) UPSView icon | |
- Move the computer mouse over "PC Settings" in the menu bar.
Refer to Illustration 6.
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| Illustration 6 | g01003395 |
- Click "Connection Settings" in the menu bar.
Refer to Illustration 6.
The dialog that is shown in Illustration 7 will open.
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| Illustration 7 | g01003391 |
(6) Direct connect radio button (7) PC COM port (8) Baud rate setting (9) Detailed MMU telemetry setting (10) OK button | |
- Click the "Direct Connect (serial)" radio button (6) .
- Select the "PC COM Port" (7) for the SERIAL Connection. Set the baud rate (8) .
Note: The radio button for "Detailed MMU telemetry" (9) must be checked.
- Click on the "OK" Button (10) in order to accept these settings.
- Click "Connection" on the menu bar.
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| Illustration 8 | g01003435 |
- Select "Connect" from the drop-down menu.
The PC will be connected to the system. The PC will receive the system telemetry.
- Once the PC is connected, click "Enter Password" (13) on the menu bar.
The "Enter User Name/Password" dialog will open. Refer to Illustration 9.
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| Illustration 9 | g01003470 |
(13) "Enter Password" | |
- Enter the user name.
- Enter the password.
- Click the "OK" button.
After the password has been entered, the menu bar will change.
The menu bar will contain a "Calibrate" option.
- On the "Op. Params." menu, select "OP Group 11 MMU Serial Number". The selection will allow access to a submenu. Select "Load Cell Serial Number" from the submenu.
Note: Perform Steps 22 through 25 if the load cell has been replaced.
- Select "Load Cell Serial Number". A "Request Operating Parameter Change" will open.
- Enter the serial number of the load cell that is located on the manufacturer data sheet.
Note: The data sheet is enclosed with the assembly (lower bearing cartridge).
Note: Enter a numeric value. Do not use the number that is shown in Illustration 10. The number in Illustration 10 is an example.
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| Illustration 10 | g01049801 |
- Select "Op. Group 5: Model Index" from the "Op. Params." menu. Then, select "Load Cell Calibration Constant" from the "Model Index" submenu.
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| Illustration 11 | g01049799 |
- Select "Load Cell" on the "Calibrate" menu. The "Load Cell Calibration" dialog will open.
- Select "View Status". A dialog box will open that provides a text message. The message indicates the status of the process (calibration). Initially, the dialog will show that the minimum has not been calibrated.
- Select "Use Defaults".
- Verify that the "Minimum" button in the dialog (calibration) is highlighted. If the "Minimum" button is not highlighted, click the "Minimum" button.
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| Illustration 12 | g01049803 |
- Disconnect the 16-pin connector for the lower wiring harness (flywheel) from the interface board (flywheel).
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| Illustration 13 | g01032443 |
- Connect the jumper (15) that is labeled "MIN".
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| Illustration 14 | g01263288 |
View of "Min/Max Jumpers" for new FWI PWAS (14) 268-0058 Cable Assembly (MAX) (15) 268-0057 Cable Assembly (MIN) | |
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| Illustration 15 | g01292481 |
View of minimum jumper (cable assembly) for older FWI PWAS (16) 253-8087 Cable Assembly (MIN) | |
- Click the "OK" button on the calibration dialog.
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| Illustration 16 | g01049808 |
- Verify that the "Maximum" button on the calibration dialog is highlighted. If the "Maximum" button is not highlighted, click the "Maximum" button. The dialog (status) will indicate that the Maximum has not been calibrated.
- Disconnect the jumper (15) that is labeled "MIN".
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| Illustration 17 | g01292501 |
View of maximum jumper (cable assembly) for older FWI PWAS (17) 253-8089 Cable Assembly (MAX) | |
- Connect the jumper (14) that is labeled "MAX".
- Click the "OK" button on the calibration dialog. The dialog (status) will indicate that the calibration values have not been saved.
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| Illustration 18 | g01049807 |
- Click the "Save" button on the calibration dialog.
Note: At the end of Step 37, two errors (temperature) will be announced on the dialog. The errors will be cleared when the wiring harness is reconnected in Step 38.
- Connect the wiring harness to the flywheel interface board.
Calibration is complete.
Calibration Check
A proper calibration can be verified by using voltage measurements and a calculator.
- Measure the voltage between pins "16" and "4" on the flywheel interface board and record the voltage. The value will be "Ve".
- Measure the voltage between pins "11" and "12" on the flywheel interface board and record the voltage. The value will be "VL". The voltage measurements are completed only with control power on.
- Calculate the force (bottom bearing) that is expected by using the equation in Illustration 19.
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| Illustration 19 | g01049809 |
- Compare the value that is calculated with the reading that is indicated by UPSView. The values should agree within ±1 percent.