2 Motor starters
2.3 Motor starter with safety function (DOS, ROS)
EMS2… Electronic motor starter
10/19 MN034003EN
www.eaton.com
13
2.3 Motor starter with safety function (DOS, ROS)
The devices described in this Section must not be operated in potentially
explosive Ex e increased safety (ATEX) areas.
Table 4: DOS (DOL starter) and ROS (reversing starter) versions
Notes
Type
Minimum
current
Rated operational current I
e
Control voltage U
S
Terminals
AC51
EN 60947-4-3
AC53a
EN 60947-4-2
24
V
DC
11
5
V A
C
-
23
0 V
A
C
Pus
h
-In
Screws
DOL starter
EMS2-DOS-T-3-24VDC
0.18 A
3 A
3 A
✓
–
✓
–
EMS2-DOS-T-9-24VDC
1.5 A
9 A
7 A
✓
–
✓
–
EMS2-DOS-Z-3-24VDC
0.18 A
3 A
3 A
✓
–
–
✓
EMS2-DOS-Z-9-24VDC
1.5 A
9 A
7 A
✓
–
–
✓
Reversing starters
EMS2-ROS-T-3-24VDC
0.18 A
3 A
3 A
✓
–
✓
–
EMS2-ROS-T-9-24VDC
1.5 A
9 A
7 A
✓
–
✓
–
EMS2-ROS-Z-3-24VDC
0.18 A
3 A
3 A
✓
–
–
✓
EMS2-ROS-Z-9-24VDC
1.5 A
9 A
7 A
✓
–
–
✓
￫
Note that the permissible continuous current for devices with a
rated operational current I
e
of 9 A depends on the type of
mounting and the ambient temperature,
￫
Currents under the minimum current specified in the table 4will
not be detected by the motor protection.
It is therefore not permissible to operate the motor under this
value – especially in applications which fall under the remit of
the ATEX guideline.
The motor starter itself will also work even though the current is
under the minimum value. This is indicated by both
PWR
and
ERR
LEDs flashing.
The relay output also signals an alarm.
