Configurable controllers with remote set point, isolated analog outputs, control algorithms for motor-driven valves, . . .
Gefran 3500-4500 Configurable Program-Controllers
Microprocessor set point programmer and controller in 48x96 / 96x96mm format (1/8 DIN -1/4 DIN).
Manufactured using SMT, the 3500 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 4500) 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 linearistion.
A second optional auxiliary analogue input is available for remote set point linear signal, potentiometer valve position feedback or input from a current transformer.
With a digital input it is possible to select between two preset set points or switch between local and remote set point.
With three isolated digital inputs, it is possible to supply a start, stop and reset signal.
The model 4500 offers the possibility of a further eight isolated programmable digital inputs for enabling and stepping the program.
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 feed-back potentiometer), retransmission signal of the measured variable, the set point, the deviation or the control of the MD8 expansion unit for an extra 8 alarm or programmable event outputs.
The model 4500 gives the possibility of an extra eight isolated digital outputs freely programmable for each step of the program.
The 3500/4500 series programmer-controllers can use up to 100 steps (100 ramps and 100 holds), grouped in 50 different programs.
The programmer can have a cyclic function, a time base configurable from seconds to days, software alarms for the control of the response of the controlled system and four different modes of restart after a power out.
The serial communication option can be for Current Loop, RS232 or RS422/485, with selectable CENCAL or MODBUS protocol, 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.
- Thermocouple, resistance thermometer and linear inputs with configurable scales and characterisation
- Remote set point, valve position or load current sensing input (optional)
- 8 configurable optoisolated digital inputs (optional)
- 8 configurable optoisolated outputs that may programmed with time (optional)
- Double independent PID outputs (Heat/Cool)
- 10 sets of PID tuning parameters to select from for each program step
- Configurable isolated retransmission output
- 2...10 configurable alarms
- Expansion up to 16 relay outputs (optional) (with 2 MD81 units)
- Serial line: optoisolated 4-wire configurable. Protocol: GEFRAN CENCAL or MODBUS