Eaton EMS2 Series Manual page 22

2 Motor starters
2.5 Layout of devices with I
18
= 9 A
e
Example
A motor with the values shown below is to be operated with an EMS2
electronic motor starter.
Motor:
Power:
Rated operational current I
at 400 V:
Startup factor I
Control panel
temperature:
Questions:
• Is operation possible?
• How should the motor starter be mounted?
Checks:
Step 1:
Check to see if the motor starter is suitable for the maximum current (56 A).
I = I x startup factor = 4.7 A x 8.5 = 39.95 A < 56 A
max Mot
Step 2:
Which motor current is permissible at an ambient temperature of 55 °C?
(￫ Figure 8, page 17)
in a row: 4 A < 4.7 A → not permissible!
•
at a distance of 20 mm: 6.5 A > 4.7 A → permissible!
•
Conclusion:
The EMS2 motor starter can be used for this application, but must be
mounted with a distance of at least 20 mm between the devices.
EMS2... Electronic motor starter 10/19 MN034003EN www.eaton.com
P
Mot
e
I
Mot
/ I : 8.5
max Mot
55 °C
= 2.2 kW
= 4.7 A