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017-882-B0-001 Rev. E (06/2018)
1.0 Introduction, Continued
1.2.4 Output Voltage Modes of Operation
The XM3-HP can be configured to Fine or Coarse Mode of operation for Output Voltage Regulation via the Power
Configuration Menu (see
Section 3.3.1, Power Information and Configuration
).
Fine Mode:
In Fine Mode the power supply will maintain the tightest output voltage regulation possible, +1/-2.5% for 89V or +1.5/-
3.5% for 63V. It will automatically adjust to and from Coarse Override Mode temporarily if:
a) The unit switches to inverter more than 2 times in a 60-day period;
b) the unit switches tap relays more than 60 times in a 60-day period.
The power supply will automatically adjust back to Fine Mode if there are less than 2 inverter transfers and less than 15
output tap switches in a 60-day period.
Coarse Mode:
In Coarse Mode the XM3-HP will maintain a wider output voltage regulation window, +1/-5% for 89V or +1.5/-6% for 63V.
In this mode the power supply switches taps as few times as possible. It will never automatically adjust to Fine Mode once
Coarse Mode is selected.
