1 Electronic motor starter EMS
1.5 Description of device
38
Elektronischer Motorstarter EMS/Electronic Motor Starter EMS
04/15 MN03407009Z-DE/EN
www.eaton.com
1.5 Description of device
1.5.1 Power supply
EMS motor starters are powered through connection terminals A1 and A2.
Connection terminal A1 is used to connect the 24 V DC supply voltage, while
connection terminal A2 is used to connect the 0 V DC reference potential.
The 0 VDC reference potential connected to A2 is output at connection
terminal
q
E; this reference potential can be used to enable (terminal E) the
command for starting the motor.
1.5.2 Control inputs
The ON (EMS-DO…), L, R (EMS-RO…) control inputs are used to drive the
corresponding direction of motor rotation. They are actuated with 24 V DC.
Meanwhile, connection terminal E (Enable) is used to enable the switching
command for the direction of motor rotation. To enable the switching com-
mand, this terminal must be connected to the 0 V DC reference potential of
control inputs ON, L, R. Finally, the ON, L, R, E control inputs are used to
switch off the motor being controlled when necessary due to safety reasons
(
Section 2.3, “Safety shutdown with long lifespan“, page 45).
NOTICE
Do not use the 0 V DC reference potential on connection
terminal
q
E to power the electronic motor starter or to power
other devices!
NOTICE
Make sure to power the supply voltage and control voltage
inputs with power supply modules that conform to DIN 19240
(maximum residual ripple of 5 %).
NOTICE
In order to prevent inductive and capacitive coupling noise
pulses when using long control cables, the use of screened
cables is recommended.
