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PRODUCTS |
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NSI manufactures temperature
sensors including
electric heating elements and distributes automation components
including pressure, transmitters, sensors, process controllers. |
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PRODUCTS |
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| Sensors / Controllers |
| 3400-4400 Configurable controllers |
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- Cascade control
- Ratio control
- Square root extraction on input signal
- Programmer with 4 set points and 4 ramps
- Thermocouple or resistance thermometer inputs and linear inputs with configurable scale and linearisation
- Isolated inputs for remote setpoint, valve position feedback signal or load break detection
- Two control outputs with independent PID parameters (Heat/Cool)
- AUTO/MAN station with bumpless transfer incorporated
- Configurable output for a retransmission signal
- Serial line: optoisolated 4-wires configurable. Protocol: GEFRAN CENCAL
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Microprocessor controller in 48x96 / 96x96mm format (1/8 DIN -1/4 DIN).
Manufactured using SMT, the 3400 provides a complete operator interface with IP54 level of protection (IP65 with faceplate cover).
The faceplate has a membrane keypad with 6 keys, a backlit LCD display that is
available also with large dimensions (model 4400) that displays the process variable,
set point, bargraphs of the percentage output power and the deviation and indication
of the alarm and controller states. The main input for the control variable is
universal and gives the possibility to connect a wide range of sensors such as
thermocouples, resistance thermometers or mV signals even with custom linearisation.
A second auxiliary analogue input is available for remote setpoint linear signal, potentiometer valve position feedback or input from a current transformer.
With a digital input it is possible to select between two preset setpoints or switch between local and remote setpoint.
With three isolated digital inputs, it is possible to select one of four setpoint
programs or supply a start, stop and reset signal, or select local/remote, auto/manual
or hold.
The instrument has up to four outputs, each one factory configured, according to the order code, as relay, isolated logic, isolated analogue or interface for MD81 expansion unit output.
The output functions are configurable from the faceplate.
Apart from the control outputs, that can be heat-cool with independent PID, and the alarm outputs, outputs can be dedicated to the open/close control of a motorised valve (with or without position feedback potentiometer), retransmission signal of the measured variable, the setpoint, the deviation or the control of the MD8 expansion unit for an extra 8 alarms.
The 3400/4400 series controllers can be used as setpoint programmers with up to 8 segments (4 ramps and 4 holds).
Other control functions are also available such as ratio control between two variables and cascade control with specific and configurable parameters.
The serial communication option can be for Current Loop, RS232 or RS485 and it is possible to read and write any of the instrument's parameters.
The programming procedure is simplified by the menu guide structure with different configuration levels for a rapid and easy access to the data. |
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