Operating Notes & Data; Checking With Voltmeters; Load Regulation; Effect Of Load Power Factor - Emerson SolaHD MCR Hardwired Serie Mode D'emploi

MCR Hardwired Series – 50 Hz & 60 Hz
A272-282 Rev. 4 02/2020
6.0 operating notes & Data
DAnGeR! High voltages are present inside the unit. Do not reach inside while it is energized. To measure
voltage, de-energize the unit, connect the meter, and then re-energize the unit.

6.1 Checking with Voltmeters

All input and output voltage measurements should be made with a true RMS voltmeter. A certain amount of
harmonics in the output may cause other types—particularly rectifier types—to give inaccurate indications.

6.2 Load Regulation

Changes in output voltage resulting from changes in resistive loads, from no load to full load (100% pF), are
approximately 4%.

6.3 effect of Load Power Factor

"Median" value of output voltage will vary from the label rating if the load has a power factor different
from the unit's design. Load regulation will also be greater as the inductive load power factor is decreased.
However, the resulting median values of output voltage will be regulated against supply line changes at any
reasonable load or load power factor.
FIGURe 12

6.4 operation with Switch-Mode Power Supplies

If an MCR is used as a source for a switch-mode power supply, a slight amount of ringing may be noticed on
the sine wave output of the unit at half cycle intervals for a short duration. This ringing occurs at the point
when the switch-mode power supply current demand drops to zero. The ringing need not be a cause for
concern since it is of relatively low magnitude and frequency. Both series have been tested with a variety of
switch-mode power supplies and it has been determined that the ringing does not affect the dc outputs, nor
has it been found to degrade the components of any switch-mode power supply.
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