2 Installation
2.6 Connecting outputs
44
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
Currents are measured in the 4 - 20 mA (0 - 20 mA) signal range. For current
measurement connect the output of the sensor to the current input (terminal
3 or 8),
section , “Temperature sensor”, page 42.
Temperatures are measured in the range -50 - +200 °C using PT100
temperature sensors. The sensor inputs 1 (terminal 4 - 6) and 2
(terminal 9 - 11) are used for temperature measuring.
On terminals 6 and 11, the analog expansion unit outputs a constant current
to the temperature sensor.
Connect the ground connection of a sensor to the corresponding 0 V input
(terminal 4 or 9) of the expansion unit.
You connect the temperature sensor directly to the relevant three terminals
of these sensor inputs. A three-wire connection or a two-wire connection is
possible.
With three-wire measuring, the line resistance is compensated by means of
a measuring bridge in the expansion unit.
With two-wire connections, connect a short-circuit bridge between terminals
5 and 6 or 10 and 11 (
2.6 Connecting outputs
Devices either have transistor outputs or relay outputs. easy800 standard
outputs: The Q… outputs of both device versions are potentially isolated
from the power supply and the inputs and therefore potential-free.
EASY806-DC-SWD outputs: There is no potential isolation between the
outputs and
•
the local inputs
•
POW
•
SWD
Galvanic isolation is provided between AUX and NET.
￫
When current measuring is activated, we recommend the
implementation of open-circuit monitoring via the diagnostics
contact R13. The expansion unit switches the diagnostics
contact to the 1 state if a current < 3 mA is present. Use current
sensors for the 4 - 20 mA signal range if you wish to evaluate
the diagnostics contact.
￫
The inputs and outputs of these analog expansion units require
the same reference potential (chassis ground) as the DC power
supply of the sensors and actuators.
Connect the 0 V of the DC power supply of the different
sensors with the 0 V of the DC power supply of the expansion
unit.
