Keysight Technologies SL1200A Series, Operating Instructions Manual

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15/44 Scienlab Regenerative AC Emulator – Keysight SL1200A Series – Operating Instructions
System Description 1
Functional Description
The SL1200A serves as a regenerative, bi-directional, 3-phase AC
source/sink, with optional DC source/sink. The system can be parameter-
ized in voltage- or current-controlled mode (Voltage Priority or Current
Priority). The system was given a compact design with integrated measur-
ing and is available as Low-Voltage (600 V, model SL1201A
– SL1203A) or
High Voltage (1200 V, model SL1212A – 1213A) variant, depending on the
respective application.
The SL1200A consists of three (45 kVA) or six (90 kVA) power stages (RPS
– regenerative power system), there are two different types of power
stages, low voltage (600 V AC, optional 500 V DC) or high voltage
(1200 V AC, optional 1000 V DC). The power stages can be parametrized
and used individually or together with each other. Thus, various configura-
tions are possible.
In AC mode, the SL1200A is operated with a sinusoidal AC voltage output
and an adjustable basic frequency of 40 to 75 Hz. This enables the opera-
tor to supply 1-, 2- or 3-phase consumers, and test them in operation by
means of targeted error emulation (Voltage Priority). If the SL1200A is
configured in Current Priority mode, the power stage synchronizes with
the voltage measured at the terminals and regulates the specified (positive
or negative) current.
The following table shows examples for AC grid emulations.
Grid Form
Description Grid /
Example AC mode
Connection SL12xxA to DUT
PE reference
Neutral Pass Through
Contactor: closed
TN/TT grid 2
Without PE reference
Neutral Pass Through
Contactor: opened
IT grid 2
Table 2: Examples for emulated AC grids
Equipped with an optional DC mode, the SL1200A can be operated as a
Voltage Priority with different output voltages. If, for example, a charging
station is tested, the system can be used to emulate the HV battery in the
vehicle (Current Priority). If, instead, the vehicle with a battery is tested,
the SL1200A can emulate a DC charging station (Voltage Priority). If a
battery is connected to the SL1200A, the battery must be monitored by a
battery management system (BMS). The outputs at the DC mode are al-
ways electrically isolated against ground (PE).
The system features two separate current paths, the power path and the
logic path. The main switch uses the power path to disconnect the power
2 TN/TT grid: The generated phases have a potential reference to grounding (PE).
IT grid: The generated phases are electrically isolated from grounding (PE).