2.12 Mains conditions
The mains conditions apply to machines connected to public mains supplies with the following
characteristics:
■ Mains frequency: 50 Hz
■ Voltage between external and neutral lines 220 V...250 V
■ Voltage between the external lines 380 V...430 V
They do not apply to private power supplies within industrial areas isolated from the public
mains.
The machines listed in the 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 network that meets these
requirements. If necessary, ask the local electricity utility for the mains conditions.
2.12.1 Supply conditions at 400V/3/50Hz
Compressor model
Start configuration
Maximal permissible
motor starts
1)
[1/h]
Highest permissible
System impedance
2)
Z
max.
[Ω]
EPC 150-2-G
Direct online
20
0.767
EPC 230-2-G
20
0.360
EPC 420-2-G
20
0.099
EPC 550-2-G
20
0.077
EPC 750-2-G
Star-delta
15
0.178
EPC 1000-2-G
15
0.104
1)
Exceeding the maximal permissible starts must be discussed with the manufacturer.
2)
The data are relative to the sum of impedances in external and neutral lines.
Tab. 25 Network impedance
Machines with current consumption >16 A ... ≤75 A comply fully with IEC 61000-3-12.
2.13 Machine duty cycle
Calculating the cycling period
Cycling time = Time under LOAD + at standstill
Calculating the duty cycle:
Duty cycle [%] =
time under LOAD
time under LOAD + at standstill x 100
Example:
12 minutes
20 minutes x 100 % = 60 %
2
Technical Specifications
2.12 Mains conditions
No.: 9_5753 24 E
Assembly and operating manual 2-stage piston compressor
EPC-2-G
13
