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Personal injury or death can result from high voltage. When power generation equipment must be in operation to make tests and/or adjustments, high voltage and current are present. Improper test equipment can fail and present a high voltage shock hazard to its user. Use electrical safety gloves when you are working in the cabinets. Make sure the testing equipment is designed for and correctly operated for high voltage and current tests being made. |
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Perform this calibration when the following components are replaced:
- APC PWA
- DCI PWA
| Calibration Error Limits | ||
|---|---|---|
| Parameter | Nominal Target | Percent Deviation |
| DC Bus Pos and Neg, full scale UPS, CSHV | 375/350 V | ± 0.5 |
| Calibration Error Limits | ||
|---|---|---|
| Parameter | Nominal Target | Total Deviation |
| DC Bus Pos and Neg, no voltage UPS, CSHV | 0 V | ± 1.0 V |
Note: The UPS/SMS or MMU should be in bypass. The Flywheel Cabinet should be shut down.
- Place the Flywheel Cabinet keyswitch to the "Spindown/Offline" position.
- Open the Flywheel Cabinet.
- Place system in Bypass mode.
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Transfer to Bypass Mode".
- Make sure that green status light in the Flywheel Cabinet is ON.
Refer to Illustration 1.
Note: When the green status light in the Flywheel Cabinet is ON, the DC Disconnect Switch can be operated.
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| Illustration 1 | g01321077 |
(1) Serial Connection (2) Status Lights (3) Disconnect Switch (Flywheel Cabinet) | |
- Connect a PC to the UPS.
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Personal Computer to UPS Connection".
- Open the DC Disconnect Switch in the Flywheel Cabinet.
Note: Opening the DC Disconnect Switch isolates the Flywheel Cabinet from the UPS/SMS or MMU DC bus.
- Select "DC Bus Voltages" from the "Calibrate" menu.
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| Illustration 2 | g01321450 |
- Ensure that "Minimum" is highlighted.
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| Illustration 3 | g01321451 |
- Attach the probes.
Refer to Illustration 4 for the type of probes to use.
Refer to the following list for the placement of the probes:
- Positive goes to the Positive side of the Flywheel Cabinet DC bus.
- Negative goes to the Neutral bus.
- Positive goes to the Positive side of the Flywheel Cabinet DC bus.
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| Illustration 4 | g01321285 |
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| Illustration 5 | g01321314 |
(6) Negative (-) (7) Neutral (8) Positive (+) | |
- Select "Use Defaults".
Refer to Illustration 3.
- Enter the value in "Enter Calibration Point".
- Select "OK".
The system displays a calibration of a channel window that shows a negative DC bus voltage.
- Move probe to negative DC bus.
- Enter the value shown on the multimeter in the "Enter Calibration Point".
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| Illustration 6 | g01321508 |
- Select "OK".
- Move probe to positive DC bus.
- Select "Maximum" in the "Calibration of a Channel" window.
The positive bus voltage begins to ramp up.
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| Illustration 7 | g01321519 |
- Enter the value shown on the multimeter in the "Enter Calibration Point" window.
- Select "OK".
- Move the probe from the positive bus back to the negative bus.
- Enter the value shown on the multimeter.
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| Illustration 8 | g01321536 |
- Select "OK".
- Select "View Status".
Note: The difference between DC bus values should be less than 10 V.
A window that is similar to Illustration 9 will open.
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| Illustration 9 | g01321548 |
- Select "Save".
The DC Bus Voltage calibration for the Flywheel Cabinet is complete.