Introduction; Figure 1: Transition To Back-Up Mode Due To Power Outage - Emerson SolaHD SDU 500A Manual

SDU AC-A Series
A272-290 Rev. 5 07/2018

1.0 Introduction

The SDU AC - A Series is a compact, "Off-Line" DIN rail mountable UPS, which provides conditioned power to
sensitive electronic equipment in an industrial environment. It supplies connected equipment with stepped
approximation to sinewave input during power outage to simulate the power generated by the utility.
AC Loss
AC Mode Battery Mode
of Power

Figure 1: Transition to Back-Up Mode Due to Power Outage

Input voltage range is 80% to 110% (ideal protection for the critical connected loads). Battery charging occurs
automatically when ac power is applied, no need to switch ON the UPS. When power fails, the UPS can be
automatically turned OFF, as long as the connected loads are not operating to save the battery energy. The
SDU also includes an automatic self-test feature to test the UPS function and battery. If the battery is no longer
useful, the unit will sound an alarm and an LED indicator will illuminate
This SDU AC - A Series has a communication port that can accommodate an optional communication card.
Contact a SolaHD Technical Support representative for a list of currently available communication cards.
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