PLATE 1101627 - Caterpillar

AC Output Current calibration is done with a load on the system. Only maximum current on each output bus is calibrated.
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.
Calibration Error Limits
Table 1
Parameter     Nominal Target     Percent Deviation    
Output Current, Pre Transformer O/P Current full scale     1400 A     1.0    Note: The system should be in Bypass mode.
Connect a PC to the UPS.Refer to Systems Operation, Testing and Adjusting, RENR7654, "Personal Computer to UPS Connection".
Place system in Bypass mode.Refer to Systems Operation, Testing and Adjusting, RENR7654, "Transfer to Bypass Mode".Note: Before proceeding, if this is a Paralleled MMU system, calibrate the MMU Currents from the Parallel Control cabinet (PCC).
Select "AC Output Currents".Note: 4-Wire menu options only appear in 4-Wire systems.
Select "Use Defaults".
Place probe clamp on the K5 bus bar for Phase A.
Illustration 1 g01307126
Current Probe ClampNote: Clamp should be rated at a 3000 amp maximum, 10 Hz to 100 kHz. The clamp should be set to 0.1 millivolts per amp.
Illustration 2 g01298917
(1) Ground (2) Phase C Output Bus Bar (3) Phase B Output Bus Bar (4) Phase A Output Bus Bar (5) Output Breaker K5 (Optional) (6) Input Breaker K1 (7) Phase A Input Bus Bar (8) Phase B Input Bus Bar (9) Phase C Input Bus Bar (10) Left Component Panel
Illustration 3 g01307130
Probe Clamp Range and Output
Take reading from the K5 bus bar for Phase A.
Enter reading into "Calibration Point".
Select "OK".
Move the clamp to the K5 bus bar for Phase B.
Take a reading.
Enter the value for Phase B that is shown on multimeter in the "Enter Calibration Point" window.
Illustration 4 g01307177
Output Current Entered for Phase B
Select "OK".
Move clamp to the K5 bus bar for Phase C.
Take a reading.
Enter the value for Phase C that is shown on multimeter in "Enter Calibration Point" window.
Illustration 5 g01307178
Output Current Entered for Phase C
Select "OK".
Select "View Status".
Illustration 6 g01307179
Phase A, Phase B, and Phase C Output Current Calibration Status
Select "Save". The AC Output Current calibration is complete.