Symbols & Terms; Use Of Symbols; Explanations Of Abbreviations And Terms - ABB OTM C 21D Installation And Operating Instructions Manual

1. Symbols & Terms

1.1 Use of symbols

Risk of Electric shock:
warns about a situation where a hazardous voltage may cause physical
injury to a person or damage to equipment.
General warning:
warns about a situation where something other than electrical equipment may
cause physical injury to a person or damage to equipment.
Caution:
provides important information or warns about a situation that may have a detri-
mental effect on equipment.
Information:
provides important information about the equipment.

1.2 Explanations of abbreviations and terms

OTM_C_21D
LN1-Switch I
LN2-Switch II
EMERG OFF (fire control
system)
AUTO
Remote test
Ts
TBs
OV
UV
4
1SCC303015M0201 l ABB Installation and operating instructions, 34OTM_C_21D rev. B
Automatic transfer switch, the type name
Power supply line, e.g. the primary line
Power supply line, e.g. the secondary line used in emergency cases
Used to drive the automatic transfer switch transfers to the "O"
position when receiving EMRG OFF signal.
Automatic mode
A sequence to test the functionality of the automatic transfer switch
Switching delay
Back switching delay
Adjustable overvoltage threshold
Adjustable undervoltage threshold
Table 1. Explanations of abbreviations and terms
1. Introduction