Remote Control of Frequency Converters
Control of frequency converters can occur not only through a built-in panel but also remotely. For this, external controllers, remote control panels, or personal computers are used. The remote control can be located up to 300 meters away from the converter itself. It has a design of a pendant block with a robust protective casing (protection degree IP20), ensuring reliability during operation.
The remote control can be used in operational modes controlling the converter via a computer or external controllers.
Technical Specifications of Remote Control Panels
| PDU-03 | PDU-05 | |
| Power Supply Voltage | 220 ± 10%, 50Hz (when using a power adapter) or 12-24 V (0.5 A) | |
| Communication Interface with Frequency Converter | RS-485 (protocol "external panel") | RS-485 (ModBus-RTU, ModBus-ASCII) |
| Communication Interface with External Devices The type of interface is specified when ordering the PDU | RS-485 (ModBus-RTU, ModBus-ASCII) or RS-232 (ModBus-RTU, ModBus-ASCII) | RS-485 (ModBus-RTU, ModBus-ASCII) |
Designation of the Remote Control Panel
The structure of the conditional designation of the remote control panel is as follows:
PDU - XX - YYY
- PDU – remote control panel;
- XX – modification code:
03 – for converters of modifications 02M1 and 04;
05 – for converters of modification 04; - YYY (only for PDU-03 modification) – type of communication interface with external devices:
232 – RS-232 interface;
485 – RS-485 interface.
Advantages of Series PЧВН and PЧВМ Converters
The converters in these series have several advantages over similar devices from other manufacturers:
- reliable protection of the converter and power drive from various emergency situations;
- flexible adjustment of operating parameters;
- regulation of technological parameters using PID controllers;
- automated operation of the drive according to a given schedule;
- a multitude of digital and analog inputs for integration with external controllers;
- RS-485 interface with ModBus protocol support;
- possibility of remote control up to 300 meters;
- simple installation, configuration, and diagnostic work;
- intuitive graphical display;
- possibility of software and hardware extension of the device's functionality.
Functional Capabilities of High Voltage Frequency Converters
The converters of series PЧВН and PЧВМ offer a wide range of protective functions for the device and the entire drive. To control the motor, the method of scalar control according to the eight points of the U/f characteristic is applied.
Methods of Controlling the Operation of the Drive
Control can be performed by the following methods:
- by commands from the operator via the local built-in panel (manual control);
- automatic change of operating mode according to a given schedule;
- remote control from a panel or external devices through the subsequent RS-485 interface.
Methods of Frequency Regulation
Frequency can be set in one of the following ways:
- through buttons on the built-in panel;
- regulating with a potentiometer;
- thanks to the built-in clock;
- by the state of discrete inputs;
- by the signal level at the input of the setter;
- through the serial RS-485 interface.
Methods of Motor Control Regulation
Motor operating modes can be regulated by one of the following methods:
- direct frequency regulation;
- PID regulation.
Main Functions of High Voltage Converters
The main functions of high voltage converters include:
- smooth starting and stopping;
- automatic control of frequency and amplitude;
- automatic maintenance of temperature and pressure;
- restarting of the drive after a brief disconnection;
- overload protection;
- dynamic braking of the drive with the presence of a braking resistor;
- flexible adjustment of the U/f characteristic;
- detailed log of emergency situations in the device's memory.