WAGO 750-458, Руководство пользователя

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14 Device Description
750-458 8AI; TC; Adjust
Manual
Version 1.3.0
3 Device Description
The analog input module 750-458(8AI; TC; Adjust) measures either voltages
(mV) in the field or analyzes thermocouples.
Depending on the sensor selection for the respective I/O module, the voltage
value is output directly or converted into the respective temperature value.
Based on the measured values supplied by the thermocouple and the cold
junction temperature, the I/O module determines the corresponding temperature
at the measuring point of the thermocouple used.
The I/O module can compensate for a cold junction at the transition point
between the thermocouple and signal line.
If cold junction compensation is active, you can choose between internal and
external cold junction compensation (see section
“Startup” > … > “Parameterization with WAGO-I/O- CHECK ”“ > … > menu item
“Channel settings”).
When using internal cold junction compensation, the I/O module records the cold
junction temperature using an internal sensor.
When using external cold junction compensation, the you specify the cold
junction temperature via WAGO-I/O- CHECK (see section “Startup” >…>
“Parameterization with WAGO-I/O- CHECK ” > … > “Monitoring”).
The I/O module has eight input channels, providing a direct connection from
thermocouples to 2-wire sensors.
The thermocouples are connected to the push-in CAGE CLAMP
®
terminals
+TC1/−TC1 … +TC8/−TC8.
The field voltage and the system voltage are electrically isolated from each other.
The assignment of the connections is described in the “Connectors” section.
Connection examples are shown in section “Connect Devices” > … >
“Connection Example(s)”.
The operational readiness and the trouble-free local bus communication of the
channels are indicated via a green function LED.
A red fault LED per channel indicates a wire break or that the signal is outside
the measuring range.
The meaning of the LEDs is described in the “Display Elements” section.
Do not exceed maximum current via power jumper contacts!
The maximum current to flow through the power jumper contacts is 10 A.
Greater currents can damage the contacts.
When configuring your system, ensure that this current is not exceeded.
If exceeded, insert an additional supply module.