5
AUTOM ATIC CONTROL U N ITS , OM D20 0 A N D 3 0 0
AU TO M AT I C CO N T R O L U N I T S , O M D 2 0 0 -3 0 0
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1 Introduction
This manual describes the installation and the basic operation of the OMD200 and OMD300 automatic
control units. The instructive part is followed by a section on available accessories.
Caution:
provides important information or warns about a situation that may have a detri-
mental 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
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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
OMD200:
The automatic control unit, standard version
OMD300:
The automatic control unit, standard version with additional power supply
control
DPS:
Dual power source
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
Gs:
Generator stop delay
