Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 77
Figure 4-2: Grid Simulator Mode
4.1.2.1 Output Relay control while in Grid Simulator mode
For some PV inverter tests, it may be necessary to ‘disconnect’ the inverter from the grid (simulated by the
power supply). the OUTPUT relay control (Output On/Off) will cause the output relay to open without the
output voltage being dropped first. It is important to make sure the inverter is in a balanced state with
respect to its load so minimal current flows into the Sequoia. If not, the relay of the Sequoia will be hot-
switched which should be avoided.
4.1.2.2 Grid Simulator Phase Modes
On Sequoia models operating in three-phase mode, the regulation mechanisms are implemented on a
phase-by-phase basis. This means that these parameters can be different for each phase. To set all
parameters to the same value for all three phases, use the individual PHASE button on the front panel to
select the individual phase A, B, and C. This will allow you to set these values for all three phases.
4.1.2.3 Basic Output Programming
For basic operation, the power supply requires the selection of the output phase number (1-Phase or
3-Phase), output phase sequence, output voltage mode (AC, DC, or AC+DC), voltage range (Low-Range
or High-Range), and adjustment of the output parameters (voltage, regenerative current, source current
limit, frequency, phase, and DC offset). This could be accomplished through the front panel display by
navigating to the appropriate menu, entering the desired values, and enabling the output; alternately, the
remote digital interface could be used with SCPI commands (refer to the Sequoia Series Programming
Manual P/N M447353-01) or the Sequoia Virtual Panels GUI; refer to AMETEK PPD website,
www.programmablepower.com, to download the latest version.
4.1.2.4 Basic Functional Test (Source and Grid Simulator Mode)
WARNING!
When performing the functional tests, exercise appropriate care to protect
against hazardous voltages that are present on the input and output.
A basic functional test of the power source could be performed with the following steps:
1. Connect an oscilloscope and DVM to the power source AC/DC Output connector. Recommended
equipment: oscilloscope, Tektronix TDS 3034C with P5202A high-voltage differential probe; DVM,
Keysight 34461A.
2. With the AC mains verified as being off, make the AC input voltage connections to the Sequoia input
connector.
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