5 Application examples
EMS2…-SWD Electronic motor starter
10/19 MN120008EN
www.eaton.com
39
5 Application examples
One of the reasons why EMS2-…-SWD electronic motor starters achieve
such a high lifespan is that the power to the contacts that are located in the
device can be disconnected. This is done by the triggering of semiconductors
and relays by the internal electronics.
For this function to be active, the motor starter needs to constantly be sup-
plied with control voltage. This supply is provided via the 24-V-voltage of the
SWD flat ribbon cable.
There are, however, application
examples where in the case of a controlled
stop the supply voltage is switched off via the SmartWire-DT in order to
achieve a safe state,
CAUTION
Since the control supply voltage or the control voltage of the
hybrid motor starter is disconnected via a single channel, this
type of installation according to SIL 3 (Cat. 3, Cat. 4) is permit-
ted, only if error prevention for cross circuits according to
EN ISO 13849 is permitted.
This is the case, for example, if the hybrid motor starter and the
safety relay are installed in the same switch cabinet.
If such error prevention is not permitted, the control supply
voltage must be disconnected via two channels or two positions
(
section 5.1, “Application without controlled stop”, page 40,
Содержание EMS2 SWD Series
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