Quadro Elettronico con Inverter QPC20-60
  • 2 Electric pumps
  • 3 Electric pumps
  • +3 Electric pumps
  • Three phase motor
  • Frequency inverter start
  • Pressurization
  • Alarm output
  • Integrated exchanger
  • IP54 protection degree

Electronic control panel for one pump (or motor) controlled by frequency inverter (at variable speed) and 1 up to 5 pumps (at fixed speed) with direct, star delta or soft start. Control panel equipped with relay alarm output and integrated pumps (or motors) exchanger and emergency operation with command by pressure switches

It is suitable for surface pumps, submersible pumps (without probes) and motors in general, with power range between 0,75 kW and 110 kW (please download the data sheet to learn more about all the available sizes and features). It can be used for pressurization, it has been conceived to keep costant pressure in water systems.

Electronic control panel with metallic case and IP54 protection degree.

Inputs and outputs

  • Input for analog transmitter 4-20mA 2 or 3 wires for water system pressure detection;
  • N. 4-8 general start up inputs for floats or pressure switches;
  • N. 2-6 (according to the model) inputs for motor temperature probes (N.C.) in fixed speed operation mode;
  • Alarm output relay with changeover contact N.O. / N.C. (250V~ 5A max, resistive load);
  • Modbus-RTU RS-485 communication;

Functions

  • Command with selector, ø 22mm LEDs and LCD display;
  • ‘Constant pressure with variable speed’ mode:

- pressure detection through analog transmitter;
- pressure adjustment through the inverter PID controller according to the set value;
- control of the main pump through inverter at variable speed, control of the secondary pumps through electromechanical start device at fixed speed (type according to the model);
- stop for ‘null flow’ (flow absence) and automatic restart once the pressure decreases;
- the inverter supplies always the same electric pump;

  • ‘Constant pressure with fixed speed’ mode (in case of emergency):

- intervention pressure adjusted by command pressure switches;
- control of the main pump through inverter at fixed preset speed. Control of the secondary pumps through electromechanical start device at fixed speed (according to the model);

  • Stop and run for the intervention of floats or pressure switches connected with the command start up inputs;
  • Independent operation in MANUAL mode, at fixed preset speed for the main pump and at full speed for secondary pumps;
  • Main disconnecting switch with door lock;

Protections

  • Protection for motor overload or phase absence:

- electronic protection for the main pump controlled by the inverter;
- thermal relay protection for the secondary pumps supplied by the network;

  • Protection for motor overtemperature:

- electronic protection without PTC motor sensor for the main pump;
- protection through motor internal sensor for the secondary pumps;

  • Protection for analog transmitter lack or fault;
  • Inverter supply, motor supply and auxiliary circuit protection fuses;
  • 24Vdc Auxiliary circuits and 24Vac from safety transformer;
  • Forced ventilation (according to the model);
  • Very low voltage inputs;
  • RFI noise filter for EMC civil environment use (power supply connected with the public network);
  • Maximum motor cable length: 150m with shielded cable, 300m with unshielded cable

Additional equipment required

Pressure analog transmitter 2 wires 4…20mA:
- SPE3/10B-G¼M-5m code 850.965 (10bar)
- SPE3/25B-G¼M-5m code 850.966 (25bar)