AMETEK MX15 Series - Manual (Page 28)

User Manual – Rev M California Instruments
MX15 28
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
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 %
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 (AC & DC) Full power can be returned into MX 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 MX 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 Output Impedance (available on MX15-1Pi, MX30-30Pi and MX45-3Pi only)
Auto-disabled 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
Power Regenerated power is displayed with a negative sign to indicate direction
of power flow.
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.