The Gefran 1200 is a high performance configurable controller, widely used in industry for processes involving transmitters (4…20mA, 0…10V) and temperature sensors.
Dimensions: 48x96, high performance, input: thermocouple, RTD, 4-20mA
Enhanced software and hardware allow a high degree of user configurability.
It is particularly in combined Heat-Cool control applications where the advanced algorithms come into play, allowing an extremely narrow band between heating and cooling without causing overlap.
Gefran 1200 Microprocessor controllers, 48x96 (1/8DIN) format , built with SMT technology. Complete operator interface, protected by Lexan membrane to guarantee an IP65 faceplate protection level.
Composed of 4 keys, double 4-digit green LED display, 4 red signal LEDs for the 4 relay/ logic outputs and 3 additional LEDs with programmable function to signal the instrument's various function states.
The main input for the variable to be controlled is universal, and allows connection of a wide variety of signals: thermocouples, resistance thermometers, thermistors, normalized linear inputs, all with possibility of custom linearization set from the faceplate. Input type is selected entirely from the faceplate and requires no external adapter shunts/dividers. A second auxiliary analog input from current transformer is available.
You can select one of the two presettable setpoints, select Manual-Automatic mode, reset the alarm memory, or enable the hold function by means of the digital input.
The instrument provides up to 4 outputs: relay (5A, 250VAC/30VDC cos? = 1) or logic (24V ± 10% (10Vmin a 20mA)). An analog output in voltage or in current is also available. The functions of each output are freely configurable from the faceplate. In addition to the control and alarm outputs, you can also have outputs that repeat the state of the digital or retransmission input by process variable, setpoint, deviation, alarm trip points and values acquired via serial line. An additional output (24VDC, 30mA max.) is available to power outside transmitters.
The serial communication option can be in Current Loop or RS485, with MODBUS RTU protocol and maximum speed of 19200 baud (485). The instrument's entire programming procedure is made easier by grouping the parameters in function blocks (CFG for control parameters, Inp for inputs, Out for outputs, etc.).
The instrument can also select the parameters to be displayed based on its hardware configuration, which automatically hides irrelevant parameters.
The instrument is supplied with an "EASY" configuration calling for just a few parameters (only those pertaining to the model ordered and essential to the controller's operation). In this way, you just have to set the setpoint and the alarm, then launch self-tuning with the specific button.
For even simpler configuration, you can use a PC programming kit consisting of a cable and a guided program for Windows environment.
Features:
- Choose from a wide range of software-selectable inputs, including 0-10V and 4-20mA.: Universal input configurable from faceplate
- Obtain perfect control by activating autotuning via button on faceplate, making commissioning very easy: Self-tuning, Auto-tuning, Soft-start, bumpless Man/Auto function
- Switch between two setpoints (e.g. “Run” and “standby”) via remote button or via button on instrument faceplate.
- Know what the controller is doing : LEDs will flash when softstart or autotuning are in progress or when a sensor fault occurs
- Trigger pre-configured control functions (alarm reset, Auto Manual mode…) via remote switch.
- Accuracy better than 0.2% f.s. under nominal conditions
- Control output: relay, logic, Triac or continuous
- Hot/cold function with selection of cooling fluid
- 3 alarms with completely configurable function
- Analog retransmission output
- Up to 2 isolated digital inputs with configurable function
- Isolated digital input with configurable function
- Auxiliary input for CT (TA) (50mAac)
- Heater break or probe short-circuit alarm
- Double set, set ramp, timed output function
- Optically isolated RS485 serial line. Protocol: GEFRAN MODBUS RTU
- Self-diagnosis
- Rapid configuration from PC with Winstrum packet
| Sensor Inputs: | |
| Types: | |
| TC- Thermocouples: | J, K, R, S, T, B, E, N, custom, L-GOST, U, G, D, C, (NI-Ni18Mo) |
| RTD 3-wires: | PT100, JPT100 |
| DC- Linear: | With scale settable in limits: -1999...9999 0...60mV / 12...60mV 0...10V / 2...10V 0...5V / 1...5V 0...1V / 0,2...1V 0...20mA / 4...20mA Imput impedance: Ri > 1M? per 60mV,1V; Ri > 10K? per 5V, 10V; Ri = 50? per 20mA Custom linearisation with 32 segment. |
| Auxiliary inputs: | For current transformer 50mAac, 50/60Hz, Ri=10? |
| Digital: | PNP: Ri = 4,7K? (24V, 5mA) insulation 1500V NPN: voltage-free contact. Function configurable among man/auto selection, local/remote (setpoint from serial line, setpoint1/setpoint2); Set/reset outputs, start/stop tuning functions, software off/on, reset alarm memory, hold. |
| Sampling time: | Acquisition of the input signal 120msec. |
| Precision: | Accuracy 0.2%f.s. ± 1 digit |
| Digital input: | |
| Outputs: | |
| Maximum number of outputs: | 4 configurable outputs: • OUT1 relay (switching contact only with OUT2 relay) • OUT2 available in relay, logic or triac • OUT3 available in relay, logic, continuous or analog retransmission • OUT4 relay or logic. |
| Types: | |
| Analog C: | 0...10V, 0/4...20mA, on 500? max only for heat/cool control output. |
| Relay: | With rating: 5A/250Vac/30Vdc, cos?=1 |
| Logic: | 24Vdc, Rout=100? (10V/20mA) |
| Triac: | 24...240Vac ± 10%, 50/60Hz, 1A max. I2t = 128A2sec. Leakage current 1.5mA max a 200Vac. |
| Analog W: | 0...10V, 0/4...20mA, on 500? resolution 12bit, for retransmission of the variable of for control |
| Transmitter power supply: | 24V ±10% not stabilized, 30mA Short circuit protection |
| Power supply: | Standard: 100...240Vac/dc ± 10% on request: 11...27Vac/dc ± 10% 50/60Hz, max. 15VA max Protection by internal fuse not serviceable by the user |
| Digital communication: | RS485 |
| Working temperature: | 0 to 50ºC |
PID Temperature Control Loop: Heat-Cool Control
Application example: Plastic Blow Moulding Machine
The purpose of a temperature control loop is to maintain the process temperature accurately at a determined level.
 | A control loop typically consists of
All parts in the control loop are essential and need to be selected, installed and set up correctly. It is particularly in combined heat-cool control applications where the advanced algorithms come into play, allowing an extremely narrow band between heating and cooling without causing overlap. By tuning the three parameters in the PID controller algorithm, the controller can provide control action designed for specific process requirements.
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