Main Functions - Omron E5CN User Manual

I/O Configuration and Main Functions
1-2-2

Main Functions

Input Sensor Types
Control Outputs
Alarms
8
This section introduces the main E5CN/CN-U/AN/EN functions. For details on
particular functions and how to use them, refer to SECTION 3 Basic Opera-
tion and following sections.
• The following input sensors can be connected for temperature input:
Thermocouple:
Infrared temperature sensor:
Platinum resistance thermometer:Pt100, JPt100
Analog input:
• Inputs with the following specifications can be connected for analog input.
Current input: 4 to 20 mA DC, 0 to 20 mA DC
Voltage input: 1 to 5 VDC, 0 to 5 V DC, 0 to 10 V DC
• A control output can be relay, voltage, or current output, depending on the
model.
• Long-life relay outputs use semiconductors for switching when closing
and opening the circuit, thereby reducing chattering and arcing and
improving durability. However, if high levels of noise or surge are imposed
between the output terminals, short-circuit faults may occasionally occur.
If the output becomes permanently shorted, there is the danger of fire due
to overheating of the heater. Design safety into the system, including
measures to prevent excessive temperature rise and spreading of fire.
Take countermeasures such as installing a surge absorber. As an addi-
tional safety measure, provide error detection in the control loop. (Use the
Loop Break Alarm (LBA) and HS alarm that are provided for the E5@N.)
Long-life
relay output
1
Varistor
2
Select a surge absorber that satisfies the following conditions.
Voltage used
100 to 120 VAC 240 to 270 V
200 to 240 VAC 440 to 470 V
• Always connect an AC load to a long-life relay output. The output will not
turn OFF if a DC load is connected.
• With the E5CN-@2@@, alarm output 2 is used as control output (cooling)
when heating/cooling control is selected. Therefore, use alarm 1 if an
alarm is required while using heating/cooling control.
• With the E5AN/E5EN-@3@@, alarm output 3 is used as control output
(cooling) when heating/cooling control is selected. Therefore, use alarms
1 and 2 if an alarm is required while using heating/cooling control.
• Alarms can be used with the E5CN-@2@@, E5CN-@1@@@U, or E5CN-
@2@@@U. Set the alarm classification and alarm value or the alarm's
upper and lower limits.
• If necessary, a more comprehensive alarm function can be achieved by
setting the standby sequence, alarm hysteresis, close in alarm/open in
alarm, and alarm latch parameters.
K, J, T, E, L, U, N, R, S, B
ES1B
10 to 70 C, 60 to 120 C, 115 to 165 C,
140 to 260 C
0 to 50 mV
Varistor
Inductive
load
Varistor voltage
1,000 A min.
Section 1-2
Surge resistance