Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 23
Current Limit Modes Two selectable modes of operation:
Constant Voltage/ Constant Current mode, voltage folds back with automatic
recovery
Constant Voltage/ Current limit (Relays open)
Automatic Level Control
(ALC)
User-selectable ALC operation enables a digitally implemented feedback
control loop to precisely regulate the RMS value of the output voltage.
Turn off programmable output impedance to use ALC.
Transient Generator
Output could be controlled to produce transient events with 500 µs
programming resolution:
Voltage: drop, step, sag, surge, sweep;
Frequency: step, sag, surge, sweep;
Voltage and Frequency: step, sweep.
Programmable Output
Impedance
The TA0022 & SQ0022 / TA0030 & SQ0030/ TA0045 & SQ0045/ TA0090 &
SQ0090 offers programmable output impedance in three-phase mode of
operation. This allows the user to simulate line impedance conditions by
programming resistive and inductive elements of the AC source’s output
impedance.
Output impedance option does not support during Multi chassis and single-
phase mode operation.
Turn off ALC to use programmable output impedance.
This feature supports only in source mode
Range : R: 1 – 200 mOhm
L: 170 – 200 uH
Resolution: R: 1 mOhm
L: 1 uH
Accuracy : 10 % FS
Operational characteristics specific to SINK- Grid Simulator mode (only for SEQUOIA model)
Protection Characteristics
The absolute value of the current exceeds the regenerative programmable
current limit set point, the output voltage of the SEQUOIA will be increased
gradually to reduce the amount of current being fed back. Note that there is no
other way for the SEQUOIA to limit the current as the current is not generated
by the SEQUOIA itself but rather by the load (inverter). Consequently, normal
current limit operation does not apply in this mode of operation. The voltage
will continue to be raised until the user set over voltage trip point is reached.
Automatic Level Control
(ALC)
User-selectable ALC operation enables a digitally implemented feedback
control loop to precisely regulate the RMS value of the output voltage.
Transient Generator
Output could be controlled to produce transient events with 500 µs
programming resolution:
Voltage: drop, step, sag, surge, sweep;
Frequency: step, sag, surge, sweep;
Voltage and Frequency: step, sweep.
Operational characteristics specific to SINK- Electronic Load mode (only for SEQUOIA model)
Protection Characteristics
User is allowed to set maximum UUT voltage and the SEQUOIA would trip on
reaching the overvoltage set point. In this operating mode SEQUOIA do not
have any control on the voltage applied by the UUT, only current drawn from
the UUT is being controlled by SEQUOIA, at any point time of time user should
ensure the Maximum UUT voltage does not exceed the maximum range
specified of the SEQUOIA.
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