Ametek MX45-3Pi - Page 40

User Manual – Rev BE AMETEK Programmable Power
MX Series 40
2.6.6 SNK (AC or DC) 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
brakes.
The SNK option requires special amplifiers that have a different control loop from
the standard MX amplifiers. Consequently, 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.
-S NK Op t i o n : 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 %
±0.25 % fo r –FC o p t i on
Phase
Accuracy:
16 - 100 Hz: < 1.5°
100 - 500 Hz: < 2°
Vo l t a g e
Distortion THD1:
(Resistive full load)
< 1 % @ 16 - 66 Hz
< 2 % @ 66 - 500 Hz
1 The distortion specification for the MX Series is valid for pure (inductance < 12 uH) resistive load conditions and using a 30 KHz Low Pass filter on
distortion meter.
Powe r
Capability ( AC & DC)
Full power f o r t h e AC o r DC m o d e can be returned into MX if current does not exceed maximum current limit
setting for selected range. Refer to Figures 2-4 and 2-5 for the maximum DC current. Se e 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
p owe r .
Programmable Output Impedance (available on MX15-1 P i , MX3 0 -3P i a n d MX45-3Pi only)
Au t o -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.