0 About this manual
0.6 Mains supply voltages
DB1 variable frequency drive
11/20 MN040031DE
Eaton.com
8
0.6 Mains supply voltages
The rated operating voltages stated in the following table are based on the
standard values for star networks with a grounded central point.
In ring networks (as found in Europe) the rated operating voltage at the trans-
fer point of the power supply companies is the same as the value in the
consumer networks (e.g. 230 V, 400 V).
In star networks (as found in North America), the rated operating voltage at
the transfer point of the utility companies is higher than in the consumer
network.
Example: 120 V
→
115 V, 240 V
→
230 V, 480 V
→
460 V.
The broad tolerance range of the DB1 variable frequency drive allows for a
permitted voltage drop of 10 % (i.e. U
LN
- 10 %) and in the 400-V category
the North American mains voltage of 480 V + 10% (60 Hz).
The rated mains voltage data is always based on mains frequencies of
50/60 Hz within a range of 48 to 62 Hz.
0.7 Units of measurement
Every physical dimension included in this manual uses international metric
system units, otherwise known as SI (Système International d’Unités) units.
For the purpose of the equipment's UL certification, some of these dimensi-
ons are accompanied by their equivalents in imperial units.
Table 1:
Unit conversion examples
￫
The permissible connection voltages of the DB1 device series
can be found in
section 1.6, “Features”, page 15.
Designation
US-American
Designation
Anglo American value
SI value
Conversion value
Length
inch
1 in (’’)
25.4 mm
0.0394
Output
horsepower
1 HP = 1.014 PS
0.7457 kW
1.341
Torque
pound-force inches
1 lbf in
0.113 Nm
8.851
Temperature
Fahrenheit
1 °F (T
F
)
-17.222 °C (T
C
)
T
F
= T
C
× 9/5 + 32
Speed
revolutions per minute
1 rpm
1 min
-1
1
Weight
pound
1 lb
0.4536 kg
2.205
Flow rate
cubic feed per minute
1 cfm
1.698 m
3
/min
0.5889