Alpha Technologies XM3-HP Series - Technical Manual - Manual (Page 22)

22 017-882-B0-001 Rev. C2 (10/2013)
1.0
Introduction
1.2 Theory of Operation, 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.
1.0 Introduction, continued