Controller & Programmer - Type GFX Valvole | Gefran | Philippopoulos s.a.
Controller & Programmer - Type GFX Valvole | Gefran | Philippopoulos s.a.

Controller & Programmer - Type GFX Valvole | Gefran

Gefran GFX-VALVOLE Controller

The Gefran GFX-VALVOLE is a microprocessor-based back-panel controller designed for three-way motorized valves (open/close) in process and temperature control loops. It is intended for applications where final control is performed by an actuator, not by SSR or direct power output. Supports operation with or without position feedback potentiometer, and offers PID or PD control algorithms.

Inputs and Position Feedback

Primary input is universal: thermocouples J, K, R, S, T, RTD Pt100/JPT100, mV, 1 V, and 20 mA, with custom linearization. Auxiliary analog input supports potentiometer ≥1 kΩ, 0/2–10 V, or 0/4–20 mA, for valve position feedback or additional process signals. Primary input accuracy: 0.2% f.s. ±1 digit at 25 °C, sampling every 120 ms.

Valve Control

Actuator parameters include stroke time, minimum movement time, dead zone, and movement setpoint threshold. Dual relay module “RR” is used for open/close commands. Controller supports heat/cool PID, on/off, PWM, autotune, self-tuning, soft-start, and power limit 0–100%.

Outputs and Alarms

Outputs: relay 3 A / 250 Vac, logic output 24 Vdc / 35 mA, and analog output 0/2–10 V or 0/4–20 mA. Up to 4 alarms: maximum, minimum, absolute/relative, symmetrical, LBA, and HB types.

Communication and Variants

Available as Master (standalone control and communication) or Slave (zone extension). Standard communication: optically isolated RS485 Modbus RTU; optional CANopen and Profibus DP.

Typical Applications

  • Three-way valves in thermal and cooling circuits
  • HVAC units with open/close actuators
  • Heat exchangers with flow control
  • Water, steam, or thermal oil loops
  • Installations with position feedback via potentiometer

Installation Conditions

Power supply 24 Vdc ±25%, consumption up to 5 W, IP20 protection, operating 0–40 °C, storage -20–70 °C. Mounting on DIN EN50022 rail or panel plate with 5MA screws.

Datasheet and documents

Description

Technical specifications

Overview

Rear panel microprocessor instrument for 3-way motorized valves.

The main input for the for the variable to be adjusted is universal, and gives the possibility of connecting various signal types: thermocouples, resistance thermometers, thermistors, linear inputs and potentiometer, all with possibility of custom linearization.

A second isolated auxiliary analog input is available, with fully configurable functions for linear signals or input from potentiometer for valve position.

Specific parameters are present for the valve control, such as actuator stroke time, minimum movement time, movement trip setpoint, dead zone.

You can also select function type, with or without potentiometer, and with PID or PD algorithm.

Description

Ideal for control of OPEN-CLOSE valves with or without potentiometer feedback

  • Two versions:

       MASTER – independent temperature control and communication unit

       SLAVE – independent temperature control unit

  • Protection: IP20
  • Universal temperature input, accuracy 0.2%
  • Configurable digital input
  • Module with double relay with valve open/close function
  • Logic output or "cooling" relay
  • Heat/cool PID, selection of cooling fluid, self-tuning, auto-tuning, soft-start
  • 4 generic alarms, LBA alarm
  • 2 configurable relay outputs
  • Field bus for Master Standard:

       "Modbus RTU" with Serial 485 optically

        Option: "PROFIBUS DP", "CANopen"