This procedure should be done whenever the APC board or the Field Coil Driver (FCD) board are replaced.
| Calibration Error Limits | ||
| Parameter | Nominal Target | Percent Deviation |
| Flywheel Field Currents, full scale | 15 A | ± 1.0 % |
| Calibration Error Limits | ||
| Parameter | Nominal Target | Total Deviation |
| Flywheel Field Currents, no current | 0 V | ± 0.15 A |
Perform the following steps in order to calibrate the field coil current for Flywheel A and Flywheel B.
- Place the keyswitch of the Flywheel cabinet in the "Spindown/Offline" position.
- Connect a PC to the UPS according to the instructions in Testing and Adjusting, "Personal Computer to UPS Connection".
- Place the system in the Bypass mode. Refer to Testing and Adjusting, "Transfer to Bypass Mode".
- Ensure that the RPM of the flywheel is zero (0).
- Open the Flywheel cabinet.
- Confirm that the green LED (3) is illuminated for the DC disconnect status before closing the disconnect switch.
- Close the disconnect switch (2) .
| NOTICE |
|---|
Failure to wait for the green LED can cause fuses to blow when the switch is closed. |
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| Illustration 1 | g01308950 |
Flywheel Disconnect Switch and Field Coil Swing Out Panel (1) Field Coil Swing Out Panel (2) DC Disconnect Switch (3) Status/Test Lights (Press to test) | |
- Open the field coil swing out panel (1) .
- Clamp the probe onto the top field coil lead (TFC +) (5) on the Field Coil Driver board of Flywheel A.
Note: The probe must be clamped onto the field coil lead and the probe must be correctly oriented to the direction of current. There is an arrow with reference symbols on the probe clamp. Orient the probe so that the arrow points in the direction of the current.
- Set the meter to measure DC millivolts.
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| Illustration 2 | g01308967 |
3000 Amp Current Probe Clamp which is Used for Field Coil Calibration | |
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| Illustration 3 | g01308969 |
Flywheel Field Coil Driver Boards (4) Attach Probe Here for BFC + (5) Attach Probe Here for TFC + (6) Flywheel B Field Coil Driver board (7) Flywheel A Field Coil Driver board | |
- Zero out the multimeter by adjusting the probe Zero Adjustment (9) .
- Properly adjust the probe Settings (8) in order to measure 20 amp.
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| Illustration 4 | g01308978 |
Field Coil Probe Adjustment (8) Probe Settings (9) Zero Adjustment | |
- Ensure that the keyswitch for the Flywheel is turned to the "spindown" position. Refer to illustration 5.
- Place the UPS on-line via the GUI touchscreen.
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| Illustration 5 | g01308979 |
Keyswitch in the "Spindown" position | |
- Open the "Commands" drop-down menu.
- Select "Command Group 1:Enter Shutdown Mode" from the "Commands" drop-down menu.
The "Command Group 1:Enter Shutdown Mode" menu appears.
- Select "Enter Shutdown Mode" from the "Command Group 1:Enter Shutdown Mode" menu.
- Open the "Calibrate" drop-down menu.
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| Illustration 6 | g01308986 |
Enter Shutdown Mode. | |
- Select "A: Field Coil Currents" from the "Calibrate" drop-down menu.
- Click the "Use Defaults" button.
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| Illustration 7 | g01308987 |
A: Field Coil Currents | |
- Enter the minimum field coil current value which is shown on the multimeter.
- Click the "OK" button.
The system switches to Maximum and the Current Value begins to ramp up.
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| Illustration 8 | g01308988 |
Calibration of a Channel - A: Top Field Coil Current Minimum Value | |
- Allow the current to stabilize.
- Enter the maximum field coil current.
- Click the "OK" button.
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| Illustration 9 | g01308989 |
Calibration of a Channel - A: Top Field Coil Current Maximum Value | |
- The window which is shown in illustration 10 appears.
- Switch the probe to the bottom field coil (BFC+) (4) on the Field Coil Driver board of Flywheel A.
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| Illustration 10 | g01308990 |
Calibration of a Channel - A: Bottom Field Coil Current Minimum Value | |
- Enter the value that is shown on the multimeter.
- Click the "OK" button.
The Current Value begins to ramp up and the "Calibration of a Channel" window switches to Maximum.
- Enter the value that is shown on the multimeter.
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| Illustration 11 | g01321328 |
Calibration of a Channel - A: Bottom Field Coil Current Minimum Value | |
- Click the "OK" button.
- Click the "View Status" button.
The window which is shown in illustration 12 appears.
- Click the "Save" button.
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| Illustration 12 | g01308991 |
Calibration Status | |
- Repeat for Flywheel B.