3 Plug-in motor starter ROSF for mounting on an adapter
3.2 Layout of devices with adapter EMS2-XTH
24
EMS2… Electronic motor starter
10/19 MN034003EN
www.eaton.com
3.2.1 Layout of devices with adapter EMS2-XBB or MSFS
When using EMS2-ROSF devices with a rated operational current I
e
of 9 A or
3 A in conjunction with an EMS2-XBB or MSFS adapter, note that the per-
missible thermal continuous current depends on the type of mounting, the
ambient temperature T
A
and the temperature T
S
of the busbar. See diagram
below.
Moreover, the maximum permissible current must not be exceeded, even in
startup. It is not permitted to use the devices described in this Section in
potentially explosive areas (ATEX).
The maximum current during startup of the motor is derived by multiplying
the motor nominal current with the “startup factor”, which with standard
asynchronous motors is usually between 6 and 10.
Contact the motor manufacturer to establish the actual value.
Figure 13: Derating curve for devices with I
e
= 9 A which are mounted at a minimum distance
of 20 mm (at least one free slot between the starters)
T
S
= temperature of the busbar
T
A
= ambient temperature in the control panel
Figure 14: Derating curve for directly linked devices with I
e
= 9 A
T
S
= temperature of the current busbar
T
A
= ambient temperature in the control panel
T
S
[°C]
20
30
40
50
60
70
80
90
100
110
120
2
3
I
L
[A]
T
A
= 40 °C
T
A
= 20 °C
T
A
= 60 °C
T
A
= 80 °C
6
8
0
4
9
7
5
1
I
e
= 3 A
I
e
= 9 A
T
S
[°C]
20
30
40
50
60
70
80
90
100
110
120
2
3
I
L
[A]
T
A
= 40 °C
T
A
= 20 °C
T
A
= 60 °C
6
8
0
4
9
7
5
1
I
e
= 3 A
I
e
= 9 A
