Term Abbreviation Explanation
Transmission control
protocol/internet
protocol
TCP/IP
The Internet protocol suite. It provides end-to-end connectivity by specifying data
handling.
Trip
An emergency or fast opening of a breaker. No attempt is made to de-load the breaker
before it opens.
United Kingdom UK
Voltage V
Electrical potential difference. U is used as an abbreviation for voltage in most of
Europe, Russia and China.
Voltage transformer VT
A transformer for a voltage measurement, so that the voltage at the controller is within
the controller's specifications.
11.2 Units
11.2.1 Units
The table below lists the units used in the documentation, as well as the US units where these are different. In the documentation,
the US units are given in brackets, for example, 80 °C (176 °F).
Table 11.1
Units used in the documentation
Unit Name Measures US unit US name Conversion Alternative units
A ampere Current
bar bar Pressure psi
pounds per square
inch
1 bar = 14.5 psi
1 bar = 0.980665
atmosphere (atm)
1 bar = 100,000
Pascal (Pa)
ºC degrees Celsius Temperature ºF Fahrenheit
T[ºC] = (T[ºF] - 32 º) × 5 /
9
T[ºC] = T[Kelvin (K)]
- 273.15
dB decibel
Noise or interference
(a logarithmic scale)
g gram Weight oz ounce 1 g = 0.03527 oz
g gravitational force Gravity, g = 9.8 m/s
2
ft/s
2
g = 32.2 ft/s
2
h hour Time
Hz hertz
Frequency (cycles per
second)
kg kilogram Weight lb pound 1 kg = 2.205 lb
kPa kilopascal Pressure psi
pounds per square
inch
1 kPa = 0.145 psi
m metre Length ft foot (or feet) 1 m = 3.28 ft
mA milliampere Current
min minute Time
mm millimetre Length in inch 1 mm = 0.0394 in
ms millisecond Time
N·m newton metre Torque lb-in pound-force inch 1 N·m = 8.85 lb-in
INSTALLATION INSTRUCTIONS 4189340909I UK Page 139 of 144
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