Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 7
2. Specifications
Unless otherwise noted, the specifications are valid under the following conditions:
a) Ambient temperature of 25 ± 5°C; after a 30-minute warm-up; fixed AC input line and load.
b) Individual unit and individual output phase, with sine wave output, and into a resistive load.
c) For system configurations, specifications are for phase output, line-to-neutral; phase angle
specifications are valid under balanced resistive load conditions.
d) Specifications are valid from 10% of the rated voltage, rated current and rated power unless
otherwise noted.
2.1 Operating modes
The SEQUOIA series supports operating mode namely Source and SINK.
The TAHOE series supports operating mode namely Source only.
a) Source Mode:
Energy is flowing from facility AC input to the Unit Under Test (UUT) through SEQUOIA/TAHOE
as shown Figure 2-1. In this operating mode, user can program output voltage with the following
possible regulation settings.
i. Constant Voltage/ Constant Current: Output voltage is regulated as per the user set
value; on reaching the current limit, the power supply regulates at the programmed current
limit
ii. Constant Voltage/ Current Limit: Output voltage is regulated as per the user set value; on
reaching the current limit, the power supply output voltage is programmed to zero.
Figure 2-1: Energy flow in source mode operation
b) SINK - Grid Simulator Mode:
This mode is applicable only for SEQUOIA series. TAHOE series does not support this mode.
Energy flow is from UUT to facility AC input through SEQUOIA as shown in Figure 2-2. In Grid
Simulator Mode SEQUOIA regulates the output voltage to the user set value and works as the grid
to UUT. SEQUOIA serve as the grid and sinks the current generated by UUT. This allows the user
to test current source type UUT such as Photo Voltaic Solar inverter or any grid tied inverter. User
can change the grid parameters such as voltage, frequency, and phase as per the requirement.
The energy received from the UUT is fed back to grid instead of dissipating as heat.
c) SINK - Electronic Load Mode:
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