2 Motor starter – overview
2.5 Layout of devices with I
e
= 9 A
EMS2…-SWD Electronic motor starter
10/19 MN120008EN
www.eaton.com
17
Example
A motor with the values shown below is to be operated with an
EMS2-…-SWD electronic motor starter.
Questions:
•
Is operation possible?
•
How should the motor starter be mounted?
Reviews:
Step 1:
Check to see if the motor starter is suitable for the maximum current (56 A).
I
max
= I
Mot
x startup factor = 4,7 A x 8.5 = 39.95 A < 56 A
Step 2:
Which motor current is permissible for an ambient temperature of 55 °C?
•
directly linked: not permissible
•
at a 20 mm distance: 6.2 A > 4.7 A
→
permissible!
Conclusion:
The EMS2-…-SWD motor starter can be used for this application, but must
be mounted with a distance of at least 20 mm between the devices.
Motor:
Power:
P
Mot
= 2.2 kW
Rated operational current I
e
at 400 V:
I
Mot
= 4.7 A
Startup factor I
max
/ I
Mot
:
8.5
Control panel
temperature:
55 °C
