Ezeio AAC, Руководство пользователя

Страница: 18 / 121

Inputs – Current sensors
Jumper
setting Description
0-30mA (suitable for 4-20mA transducers)
An internal 100 Ohm resistor connects the input terminal to Common.
Raw reading is about 10000 at 30mA (3uA per count)
To use 0-30mA (or 4-20mA) sensors, after setting the input jumper as
explained above, connect the current loop sensor between the +DC output
terminal and the input, like this:
The +DC output provides nominally 1V less than the voltage on the DC
input. The standard DC adapter shipped with the ezeio
™ outputs just over
12V. If a higher voltage is required for the current loop sensor, either use a
different adapter for the ezeio
™ , or feed the current loop from an external
source, like this:
The internal current sense resistor in the ezeio ™ is 100 Ω , so the loop voltage
drop at 20mA will be 2V ( U = R · I ).
Check the data sheet for your current sensor and make sure the voltage
source is at least 2V higher than the minimum voltage for your sensor.
Page 18 of 121
0-10V / 4-20mA
Relays
Inputs
Max 50V, 2A
Server
GSM/GPRS
1 2 3 4 C
+
1 B A
+
C 2
. . . .
ModBus
NC NO NC NO
Inputs 1 - 4 ▶
Current loop
using DC from
eze
io
+ DC ◀
0-10V / 4-20mA
Relays
Inputs
Max 50V, 2A
Server
GSM/GPRS
1 2 3 4 C
+
1 B A
+
C 2
. . . .
ModBus
NC NO NC NO
Inputs 1 - 4 ▶
Current loop
using external
DC source
Common
◀
C = 0 volts