Sequoia / Tahoe Series User Manual California Instruments
294 M447352-01 REV-A
CAUTION!
The AC input power must be cycled off and then on when calibration has been
completed to terminate the alignment routines and have calibration take effect. This
is necessary also if only subsections of the calibration procedure are performed.
9.3.2 Procedure For Three-Phase AC Synchronization.
1. Use any AC power supply as Source. Set the voltage, Current, phase sequence & frequency for
the Source. Ensure the programmed current limit of the Source must be higher than the
set current of the Sequoia unit. Make sure the Voltage Source and Sequoia unit voltage
ranges are the same.
2. Make the phase sequence of the voltage source to 0°, 240, 120°.
3. Use the below commands for setting the SQ unit.
SYNC:VOLT <numeric value > (numeric value is same as the set voltage of the Voltage
Source)
SYNC:FREQ <numeric value > (numeric value is same as the set frequency of the Voltage
Source)
Note: Voltage and frequency values are to be programmed as per the respective test cases.
4. Select the individual Phase 1, 2, and 3, and set the phase sequence value as 0°, 240°, and 120°
by sending the below command:
INST:NSEL 1; SYNC:PHASE 0; INST:NSEL 2; SYNC:PHASE 240; INST:NSEL 3;
SYNC:PHASE 120
5. Turn ON the output of the Source (AC power supply).
6. Query the below command for getting the status of the Sequoia unit.
SYNC:STAT?
This should give a response as IDLE
7. Synchronize the Sequoia unit with the Voltage Source by sending the below command or
pressing the Sync button from the front panel, refer to the below image.
SYNC:START
Figure 9-1: Dashboard Screen– eLoad
8. Verify the status using the below command.
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