5 Application examples
5.2 Reversing starter 24 V DC with safety function (dual-channel) (cat. 3, SIL 3, PL e)
EMS2… Electronic motor starter
10/19 MN034003EN
www.eaton.com
37
Figure 21: Reversing starter with safety function (dual-channel)
In this example (shown in figure 21), the EMS2-ROS… motor starter is used
in combination with an ESR5 series safety relay. The preset for the control
commands for the operating direction takes place directly at 24 V DC on the
L or R terminal.
In contrast to the previous example, in the case of a controlled stop, the
supply voltage on the terminals A1 and A2 is switched off by the safety relay,
which causes a reduction in the lifespan of the motor starter.
Please also note the information about the lifespan of devices on Page 33.
L1
L2
L3
N
PE
GND
ESR5-NO-21-24 V AC-DC
24 V DC
GND
24 V DC
F1
3/
L2
1/
L1
A
2
A
1
E
R
L
5/
L3
2/
T1
4/
T2
6/
T3
95 96 98
M
3 ~
W1
V1
U1
MAN
RES
AUT
S2
S2
A1
S11 S12 S21 S22
13
23
31
A2
S33 S34
14
24
32
S3
EMS2-ROS-…
