5-21
Copyright 2017 Cummins Inc.
Digital Ammeter Display Calibration
16. Select “>>” from the Main Menu (Page 5-9).
From this menu proceed to the AMPS L1 menu
(Page 5-11).
17. With the generator set OFF, attach a calibrated
ammeter to L1.
18. Start the generator set and allow it to reach
normal operating speed.
19. Load the generator set to maximum rated kVA
at rated voltage.
20. Calibrate the reading for AMPS L1 so that the
reading on the digital display agrees with cali-
brated ammeter.
21. Repeat steps 17 through 20 for L2 and L3. (In
step 17, attach meter to L2 to calibrate AMPS
L2 and then L3 to calibrate AMPS L3.)
22. If no calibration was made, select EXIT. If a cal-
ibration was made, SAVE, then EXIT.
Digital Power Factor Display Calibration
Power factor calibration is not required except in ap-
plications requiring a higher accuracy than 5%. If
the 5% accuracy is not acceptable, further calibra-
tion will require reactive load sufficient to reach 0.8
PF at rated load, and calibrated instruments with
1% accuracy or better. Typical load rack instru-
ments are not accurate enough to perform this pro-
cedure.
23. Select “>>” from the Main Menu (Page 5-9).
From this menu proceed to the PF1 menu
(Page 5-11).
24. With the generator set OFF, attach the power
factor meter to L1.
25. Start the generator set and allow it to reach
normal operating speed.
26. Load the generator set to maximum rated kVA
at rated voltage.
27. Calibrate the reading for PF1 so that the read-
ing on the digital display agrees with power fac-
tor meter.
28. Repeat steps 24 through 27 for L2 and L3. (In
step 24, attach meter to L2 to calibrate PF2 and
then L3 to calibrate PF3.)
29. If no calibration was made, select EXIT. If a cal-
ibration was made, SAVE, then EXIT.
Digital Coolant Temperature Display
Calibration
An engine sensor calibration tool is required to per-
form this procedure.
30. With the generator set OFF, replace the coolant
temperature sender with the precision resistor
provided in the calibration tool.
31. Select “>>” from the Main Menu (Page 5-9).
From this menu proceed to the COOLANT
TEMP L menu (5-11).
32. Calibrate the temperature reading to match the
temperature indicated on the calibration tool.
33. Repeat step 32 for COOLANT TEMP R if the
engine uses two sensors.
34. If no calibration was made, select EXIT. If a cal-
ibration was made, SAVE, then EXIT.
Analog Meter Calibration
35. Select “>>” from the Main Menu (Page 5-9).
From this menu proceed to the A−C VOLTS
ADJ TO menu (Page 5-13).
36. Start the generator set and allow the generator
set to reach normal operating speed.
37. Calibrate the analog Voltmeter to the digitally
displayed value.
38. Calibrate the analog % Amps meter to the digi-
tally displayed value.
39. Calibrate the analog % Load meter to the digi-
tally displayed value.
40. Calibrate the analog Frequency meter to the
digitally displayed value.
41. SAVE, then EXIT.
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