Advantech EKI-122 R-CE Series, User Manual, Page: 31 / 71

20 EKI-122xR-CE Series User Manual
Electromagnetic Interference (EMI) affects the transmission performance of a device.
By properly grounding the device to earth ground through a drain wire, you can set
up the best possible noise immunity and emissions.
Figure 2.10 Grounding Connection
By connecting the ground terminal by drain wire to earth ground the modbus router
and chassis can be ground.
2.6.4 Wiring a Relay Contact
The following section details the wiring of the relay output. The terminal block on the
EKI-122xR-CE Series is wired and then installed onto the terminal receptor located
on the EKI-122xR-CE Series.
Figure 2.11 Terminal Receptor: Relay Contact
The terminal receptor includes a total of six pins: two for PWR1, two for PWR2 and
two for a fault circuit.
2.6.5 Wiring the Power Inputs
Note! Before applying power to the grounded modbus router, it is advisable to
use a volt meter to ensure there is no voltage difference between the
power supply’s negative output terminal and the grounding point on the
modbus router.
PWR2
P-Fail
DC12-48V PWR1
V2- V2+ V1- V1+
1A@24V
Drain Wire with Lug
Connection to
Grounding Point
PWR2
P-Fail
DC12-48V PWR1
V2- V2+ V1- V1+
1A@24V
Caution! Do not disconnect modules or cabling unless the power is first switched
off.
The device only supports the voltage outlined in the type plate. Do not
use any other power components except those specifically designated
for the modbus router device.
Warning! Power down and disconnect the power cord before servicing or wiring
the modbus router.