SEAL-O-RING 1085803 - Caterpillar

Input Current calibration is done with a load on the system. The load amount is 600 KVA or approximately 50 percent of normal load.
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.
Table 1
Parameter     Nominal Target     Percent Deviation    
Input Current, full scale     1400 A     1.0    Note: The system should be in Bypass mode.
Connect a PC to the UPS/SMS or MMU.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).
Illustration 1 g01307124
Input Currents Calibration
Illustration 2 g01307125
Calibration of a Channel
Select "In-Currents" from the "Calibrate" menu.Refer to Illustration 1.Note: 4-Wire menu options only appear in 4-Wire systems.The "Calibration of a Channel" window appears. Refer to Illustration 2.
Open the left Input/Output cabinet door.
Attach AC current probe to the input bus bar for phase A.
Illustration 3 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 4 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 5 g01307130
Probe Clamp Range and Output
Take a reading of the bus bar current for Phase A using an averaging multimeter.
Select "Use Defaults".
Enter the value in the "Enter Calibration Point" window for Phase A.
Illustration 6 g01307133
Input Current Entered for Phase A
Select "OK".The calibration window changes to Phase B Input Currents.
Move the probe clamp to the input bus bar for Phase B.
Take a reading of the Input Current for Phase B.
Enter the value in the "Enter Calibration Point" window.
Illustration 7 g01307135
n Current Entered for Phase B
Select "OK".
Move the probe clamp to the input bus bar for Phase C.
Take a reading.
Enter the value in "Enter Calibration Point" window.
Illustration 8 g01307139
Input Current Entered for Phase C
Select "OK".
Select "View Status".
Illustration 9 g01307141
View Status of Input Currents
Make sure that the Input Currents for Phase A, Phase B, and Phase C are calibrated.
Select "Save".The UPS/SMS or MMU automatically returns to the bypass mode. The Input Current Calibration is complete.