Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 309
Cause Solution
The crest factor of the load exceeds 5:1.
Reduce load current peaks by reducing load or adding power
sources in the parallel group.
11.3.5 Unit Shuts Down after Short Interval
Cause Solution
The load has a high inrush current and
exceeds the current setting in
constant-voltage/current-limit mode.
Increase time delay for current-limit detection; add power
sources in the parallel group to increase output current
capability.
Output is short-circuited. Remove output short-circuit.
Remote sense leads are connected in
reverse polarity
Correct sense wiring.
11.4 Basic Troubleshooting in eLoad Mode
Refer to the following tables for problems that might arise related to basic operation and connection of the
power supply in the eLoad mode of operation.
11.4.1 Over Voltage Fault
Cause Solution
Excess voltage applied by the UUT to the
Sequoia unit
Check the voltage applied by the UUT is with in the voltage
range of Sequoia init
11.4.2 Sync settings error
Cause Solution
Voltage Magnitude, frequency or phase
sequence not matching applied by the UUT to
Sequoia output is not matchings with the sync
setting parameters entered in Sequoia unit
Verify Sync settings in the Sequoia are matching to the UUT
output such as Voltage, frequency, and phase sequence.
.
11.4.3 Distorted Output current
Cause Solution
Crest factor greater than 3
In random wave generation, make sure the crest factor is less
than 3
11.4.4 Over Current fault in the UUT
Cause Solution
The slew rate is programmed to a high value
Reduce slew rate by sending SCPI command Curr:slew
<value> to limit spike.
Neutral wires of Sequoia and UUT are not
connected
Make sure the Neutral wire is connected. In Eload mode neutral
wire of sequoia and UUT are connected.
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