2.12 Network Conditions
The machines listed in table are intended for operation with a public power supply with a network
impedance at the transfer point (house connection) of maximum Z
max
[Ohm].
The operator must ensure that the machines are only connected to a supply network that meets these
requirements.
The local electricity utility will provide information on the network impedance.
2.12.1 Mains conditions at 400V/3/50Hz
Model
Start configuration
Starts [1/h]
Z
max
[Ω]
EPC 150–2
Direct online
20
0.767
Star-delta
—
EPC 230–2
Direct online
20
0.360
Star-delta
1.266
EPC 420–2
Direct online
15
0.099
Star-delta
0.366
EPC 550–2
Direct online
15
0.077
Star-delta
0.280
EPC 750–2
Direct online
15
0.048
Star-delta
0.178
EPC 1000–2
Direct online
15
0.029
Star-delta
0.104
Tab. 25 Network impedance
2.13 Machine duty cycle
Calculating the cycling period:
Cycling time = time under load + time at standstill
Calculating the duty cycle:
Duty cycle [%] =
time under load
time under load + standstill time
x 100
Example
12 minutes
20 minutes
x 100 % = 60 %
The following values are valid for:
■ 20 °C ambient temperature
■ 30 % relative humidity
■ 1013 mbar air pressure
Model
Permissible duty cycle
2
[%]
Cycling period
1
[min]
EPC 150-2-G
≤ 70
3–30
2
Technical Specification
2.12 Network Conditions
12
Assembly and operating manual 2-stage piston compressor
EPC-2-G
No.: 9_5753_04 E
