Memory-type Temperature Controllers

I. Overview
LU-928M memory-type manual operator is a high-performance, high-reliability intelligent industrial controller adopting a brand-new design concept. It is mainly used for temperature control of kilns, can eliminate the need for a servo amplifier to directly drive the actuator, and is widely used in chemical, ceramics, glass and other industries.
Main features:
It adopts an advanced ARM processor, featuring fast processing speed, simple interface components, and high reliability and stability.
The control input (controller input signal) can be set arbitrarily to 0~10mA, 4~20mA standard current or 0~5V, 1~5V standard voltage, etc. It is compatible with various valve position feedback signals, including standard voltage, standard current and three-wire potentiometer. It also has a virtual valve position feedback function, eliminating the need to connect a valve position feedback signal and automatically tracking the valve position status through relevant valve position parameter settings. It provides manual and automatic signal outputs, and can also accept controller event signal (dry contact) input. It has a valve position dead band function, and the dead band range can be set via register. The upper and lower limits of the valve position can also be set and valve position calibration can be performed via registers. Through the transmitter source parameter settings, the transmitter function of the control input signal or valve position feedback signal can be realized.
Dual-row 4-digit digital tube plus 20-line light column display, human-machine interaction operation, simple and easy to use. Plug-and-play modular structure and rich output specifications meet various application requirements.
It adopts the standard MODBUS communication protocol, with strong versatility and high reliability. Strong anti-interference performance, passing the industrial level-3 electromagnetic compatibility test requirements.
II. Main Technical Specifications
Control signal and feedback signal input specifications and range:
Standard millivolt signal: custom 0~100mV
Standard resistance signal: custom 0~500 ohm
Standard voltage signal: 0~10V, 0~5V, 1~5V, custom 0~10V
Standard current signal: 4~20mA, 0~10mA, custom 0~20mA
Three-wire potentiometer: potentiometer below 10K ohm
Measurement accuracy: 0.2 class (±0.2%FS±1 digit)
Sampling resolution: 1 digit
Sampling period: 0.5 s
Control mode: manual control, automatic control, hard manual control
Output mode: forward rotation and reverse rotation relay output (250VAC/0.8A, normally open).
Forward rotation and reverse rotation SCR contactless output
Analog signal output
Event input: manual/automatic status switching. Closed switches to manual, open switches to automatic
Event output: manual/automatic status signal. Alarm on is manual, alarm canceled and open is automatic
Power supply voltage: 85~265VAC
Overall power consumption: less than 4W
Operating environment: temperature -10~+60°C, humidity 0~80RH%
III. Output Interface Modules
D1 On/off signal dry contact isolated input module
I5 Optically isolated analog current output module
U5 Optically isolated analog voltage output module
J7 Dual relay contact output module (250VAC/0.8A, normally open)
J8 Relay contact output module (250VAC/3A, normally open + normally closed)
J9 Relay contact output module (250VAC/0.8A, normally open + normally closed)
S2 Optically isolated RS232 communication module
S4 Optically isolated RS485 communication module
T7 Optically isolated dual-channel SCR zero-crossing trigger module
V6 Isolated 12V/50mA transmitter supply output module
V7 Isolated 24V/50mA transmitter supply output module