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2.6.6
SNK Option Specifications
The –SNK or current sink option enables the MX 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 MX 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
MX amplifiers. In the AC mode the upper frequency limit of an MX configured with the –SNK
option is 500Hz as opposed to the standard 819Hz. Also, the voltage distortion levels are slightly
higher than on MX units without this option.
-SNK Option: The following specifications apply to the AC mode unless specified otherwise
Range:
Resolution:
A ccuracy:
A ccuracy:
Distortion THD
:
1
(Resistive full load)
Capability (A C & DC)
W ithout –SNK option
Programmable
Output Impedance (available on MX15-1Pi, MX30/2-30Pi and MX45/3-3Pi only)
A uto-disabled
Power
All other specifications of the MX system remain unchanged if this option is installed.
1
The distortion specification for the MX Series is valid for pure (inductance < 12 uH) resistive load conditions and
using a 30 KHz LP filter on distortion meter.
26
Frequency
-HF option:
16 Hz - 500 Hz
0.01 Hz
< from 16.00 to 81.92 Hz
0.1 Hz
> from 82.0 to 500.0 Hz
± 0.01 %
Phase
16 - 100 Hz:
< 1.5°
100 - 500 Hz:
< 2°
Voltage
< 1 % @ 16 - 66 Hz
< 2 % @ 66 - 500 Hz
Power
Full power can be returned into M X as long as current does not exceed maximum
current limit setting for selected range. See REGENERA TE CONTROL screen for
protection settings in REGEN mode.
M X units without the SNK will generate a warning message (Error 31) if more than
20% of available power (per phase) is regenerated by the load. It will shut off (Error
32) if the negative power reaches 30% of available power.
Programmable impedance is turned off as soon as a regenerative load is detected.
Once turned off, it will remain off until programmed by user again. This is required as
programmable impedance is based on delivering current which is not the case when
driving a regenerative load.
Measurements
Regenerated power is displayed with a negative sign to indicate direction of power
flow.
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