Keysight SL1200A Series Operating Instructions Manual page 17

System Description 1
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 always
electrically isolated against ground (PE).
To test the DUT to mains fluctuations, the SL1200A emulates electrical supply
grids with different harmonics and interharmonics. Harmonics can be
generated in Voltage Priority or Current Priority modes. The SL1200A can
measure and control 50 harmonics and additionally control two free
frequencies for interharmonics. The limits are based on the requirements of
the standards EN61000-2-2 and EN61000-4-13 as well as UL2231-2.
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 stages
and the grounding conductor interconnections from the mains. In the event of
an emergency stop, the main switch switches the output to a safe condition.
Figure 1: Two current paths of SL1200A
When switching the system off via the main switch, some components
connected in the logic chain (e. g. measurement and control unit (MCU),
switch and safety relay) are not switched off by the supply disconnecting
device and continue to be supplied with voltage (lines marked orange) to
maintain communication between system and operating software, even in the
event of an emergency stop. The logic path can be switched off via the circuit
breaker. This switch is located on the front behind the detachable panel.
When the logic path is switched off, the power path cannot be switched on.
Optionally, the system is equipped with an extended safety device (Increased
Safety function, - ST2/SD2 option). Before the system can be switched on via
the main switch, the safety relay checks all safety-relevant switching
Scienlab Regenerative AC Emulator – SL1200A Series – Operating Instructions 17/51