AMETEK RS Series - Manual (Page 29)

User Manual AMETEK Programmable Power
RS Series 29
2.6.6 SNK Option Specifications
The –SNK or current sink option enables the RS power source to sink current from the unit
under test. This mode of operation is particularly useful when testing grid-tied products that feed
energy back onto the grid. The ability of the RS to simulate the grid provides unique
opportunities to test the EUT for compatibility to commonly occurring line anomalies like voltage
and/or frequency fluctuations. Examples of these types of EUT are inverters (PV Solar, Wind)
hybrid drive systems, regenerative breaks.
The SNK option requires special amplifiers that have a different control loop from the standard
RS amplifiers. Consequently, the upper frequency limit of an RS configured with the –SNK
option is 500Hz as opposed to the standard 819Hz. Also, the voltage distortion levels are slightly
higher than on RS units without this option.
-SNK Option:
Frequency
Range: -HF option: 16 Hz - 500 Hz
Resolution: 0.01 Hz < from 16.00 to 81.92 Hz
0.1 Hz > from 82.0 to 500.0 Hz
Accuracy: ± 0.01 %
±0.25 % for the FC option
Phase
Accuracy: 16 - 100 Hz: < 1.5°
100 - 500 Hz: < 2°
Voltage
Distortion THD
1
:
(Resistive full load)
< 1 % @ 16 - 66 Hz
< 2 % @ 66 - 500 Hz
Power
Capability Full power can be returned into RS as long as current does not exceed
maximum current limit setting for selected range. See REGENERATE
CONTROL screen for protection settings in REGEN mode.
Without –SNK option RS units without the SNK will generate a warning message (Error 31) if
power is regenerated by the load. If back driving continues, the RS will
shut off (Error 32).
Measurements
Power Regenerated power is displayed with a negative sign to indicate direction
of power flow.
All other specifications of the RS system remain unchanged if this option is installed.
1
The distortion specification for the RS Series is valid for pure (inductance < 12 uH) resistive load conditions and
using a 30 KHz LP filter on distortion meter.