SEAL-O-RING 1085806 - Caterpillar

The following instructions explain the procedure that is used in order to calibrate the 4-Wire Out Voltages for the UPS 1200. These voltages are measured at the 4-Wire Transformer cabinet. The calibration needs to be done when the External Source Sync (ESS) board has been replaced.
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.
Illustration 1 g01304449
Perform the following steps in order to calibrate the AC voltages.
Connect a PC to the UPS. Refer to Systems Operation, Test and Adjust, REHS7654, "Personal Computer to UPS Connection" .
Open the doors to the 4-Wire Transformer cabinet.
Illustration 2 g01300850
4-Wire Out Voltages Selection
Open the "Calibrate" drop-down menu in UPS View.
Select "4 Wire Out Voltages" from the "Calibrate" drop-down menu.The "Calibration of a Channel" dialog which is shown in Illustration 3 appears.
Illustration 3 g01300851
"Calibration of a channel"
Click the "Use Defaults"button in the "Calibration of a Channel" dialog.
Attach the positive probe from a multimeter to the Phase A bus bar in the 4-Wire transformer cabinet. Attach the negative probe to the Phase B bus bar.Referencerefer to illustration 5 in order to identify the bus bars.
Illustration 4 g01298244
Multimeter ProbesNote: Attach the probes to any flat section of the bus bar. Do not attach the probes to bolts. Some bolts may be insulated.
Illustration 5 g01300855
(1) Phase C (2) Phase B (3) Phase A (4) Neutral
Enter the value that is indicated by the multimeter in the "Enter Calibration Point" field.
Illustration 6 g01300897
Entering the Calibration for Phase A and Phase B
Click the "OK" button.
Move the positive probe to the Phase C bus bar.
Enter the value that is indicated by the multimeter in the "Enter Calibration Point" field.
Illustration 7 g01300894
Enter the value for Phase C.
Click the "OK" button.
Move the positive probe to the neutral bus bar.
Enter the value that is indicated by the multimeter in the "Enter Calibration Point" field.
Illustration 8 g01300898
Click the "OK" button.
Click the "View Status" button.
Illustration 9 g01300901
Completed "Calibration status"
Click the "Save" button.The 4-Wire Out Voltage calibration is now complete.