ABB OMD100 - Introduction; Use of Symbols; Explanations of Abbreviations and Terms

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AUTOMATIC CONTROL UNIT, OMD100
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1. Introduction
This manual describes the installation and the basic operation of the OMD100 automatic control
unit. The instructive part is followed by a section on available accessories.
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1.1 Use of symbols
OMD The control unit of automatic transfer switching equipment, common type name
for the automatic control unit
OMD100 The automatic control unit, basic version with simplified functionalities
LN1-Switch I Power supply line, eg. the primary line
LN2-Switch II Power supply line, eg. the secondary line used in emergency cases
Test sequence A sequence to test the functionality of the OMD and the connected change-over
switch
Ts Switching delay
Tbs Back switching delay
Caution: provides important information or warns about a situation that may have a
detrimental effect on equipment.
General warning: warns about a situation where something other than electrical
equipment may cause physical injury to a person or damage to equipment.
Hazardous voltage: warns about a situation where a hazardous voltage may cause physical
injury to a person or damage to equipment.
Information: provides important information about the equipment.
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1.2 Explanations of abbreviations and terms