overview

The NHR-7400/7400R series LCD four-way PID regulator/recorder can switch between fixed-point control and regulation, and program segment control and regulation according to production control requirements. Adopting artificial intelligence PID control algorithm and four-way independent PID regulation, it has the characteristics of no overshoot or overshoot, and is suitable for control systems that require high-precision measurement. It can control measurement signals such as temperature, pressure, liquid level, and speed.
According to the control method, it can be divided into the following categories:

NHR-7410/7410R Four way PID regulator/recorder	It can input four measurement signals, which are compared with the set control target value and output four independent control signals based on PID calculation results. It can choose control output methods such as voltage, current, SSR drive, single/three-phase thyristor zero crossing trigger, etc.
NHR-7440/7440R Four channel program regulator/recorder	Four measurement signals can be input, and the target curve can be set for control according to the requirements of the production process. It can achieve the operation of running, stepping, pausing, ending, and waiting states for curve control.

　instrument panel

160 * 80mm (Type A)	80 * 160mm (Type B)	96 * 96mm (Type C)
		① Display panel ② USB and SD interfaces ③ Confirm button Display channel switch key Time scale switch, manual/automatic switch key ④ Right cursor shift key ⑤ Left cursor shift key ⑥ Cursor up key ⑦ Cursor down key

Simple visual indication 　Wiring diagram

Note 1: If different functions are marked on the same group of terminals in the wiring diagram, only one function can be selected. If RS485 and RS232 are connected to the same set of terminals, only one can be selected. Note 2: The direction of the wiring terminals on the back cover of the horizontal and vertical instruments is different, as shown in Figure 1.

instrument selectionNHR-74 □-□-□-□-□-□
Four way PID regulator ①②③③③⑤⑥
NHR-74 □R-□-□-□-□-□
Four channel PID control recorder ①②③③③⑤⑥

① Control method		② Specification and size
code	control mode	code	Width * Height * Depth
10 40	Fixed-point PID control Program segment control	A B C	160 * 80 * 110mm (horizontal) 80 * 160 * 110mm (vertical) 96 * 96 * 110mm (Method)
③ Control output (Note 1)		④ Alarm output
code	Output type (load resistance RL)	code	Alarm channel (relay contact output)
0 1 2 3 4 5 K1 K3 K4 K5	4-20mA(RL≤600Ω) 1-5V(RL≥250KΩ) 0-10mA(RL≤1.2KΩ) 0-5V(RL≥250KΩ) 0-20mA(RL≤600Ω) 0-10V(RL≥4KΩ) RELAY CONTACT OUTPUT Zero crossing trigger pulse output of thyristor Solid state relay driving voltage output Phase shifted trigger output	X 1 2	no-output 1-limit alarm 2-limit alarm
		⑤ Power supply
		code	Voltage range
		A D	AC/DC 100～240V(AC/50-60Hz) DC 20～29V
⑥ Additional functions (all of the following functions can be selected, separated by "/", functions that are not selected can be omitted)
Communication output		Feed output
code	Communication interface (communication protocol)	code	Feed output (output voltage)
D1 D2 D3	RS-485 communication interface (Modbus RTU) RS232 communication interface (Modbus RTU) RS232C printing interface	1P 2P	1-channel feeding output 2-channel feeding output
Suitable for instruments with records
USB transfer function		Extended functionality
code	Transfer function	code	Extended functionality
U	USB card transfer (with 1GB USB flash drive)	SD	SD card expansion (capacity 8GB)

remarks:
1. When the control output methods of each channel are inconsistent, please provide an explanation in the selection section.
2. Example of instrument model:
Example 1: NHR-7410-A-0-2-A-D1/1P (four PT100 inputs, two 4-20mA transmission outputs)
Meaning: Four channel fixed-point PID control, specifications of 160 * 80 * 110mm, 4-20mA control output, 2-limit alarm output, AC100-240V power supply, RS485 communication, 1-channel power supply output.
Example 2: NHR-7440R-B-3-2-A-2P/SD (four 4-20mA inputs, four 0-5V control outputs).
Meaning: Four channel program segment control with recording function, specifications of 80 * 160 * 110mm, 0-5V control output, 2-limit alarm output, AC100-240V power supply, 2-channel power supply output, SD card expansion function.Input signal type (please specify the signal type when placing an order)

signal type	Range of measurement	signal type	Range of measurement
B S K E T J R N F2 Wre3-25 Wre5-26 Cu50 Cu53 Cu100 Pt100 BA1	400～1800℃ -50～1600℃ -100～1300℃ -100～1000℃ -100.0～400.0℃ -100～1200℃ -50～1600℃ -100～1300℃ 700～2000℃ 0～2300℃ 0～2300℃ -50.0～150.0℃ -50.0～150.0℃ -50.0～150.0℃ -200.0～650.0℃ -200.0～600.0℃	BA2 0～400Ω 0～350Ω 30～350Ω 0～20mV 0～100mV 0～20mA 0～10mA 4～20mA 0～5V 1～5V 0～10V 0-10mA square root 4-20mA square meter 0-5V square root 1-5V square root	-200.0～600.0℃ -9999～99999 Special customization Special customization -9999～99999 -9999～99999 -9999～99999 -9999～99999 -9999～99999 -9999～99999 -9999～99999 Special customization -9999～99999 -9999～99999 -9999～99999 -9999～99999

Output signal type (please specify the signal type when placing an order)

signal type	4-20mA	1-5V	0-10mA	0-5V	0-20mA	0-10V (specially customized)
Load resistance RL	RL≤600Ω	RL≥250KΩ	RL≤1.2KΩ	RL≥250KΩ	RL≤600Ω	RL≥4KΩ