UNITROL 1020 3BHE030579R0003 Excitation controller input/output module

Description

ABB UNITROL 1020 3BHE030579R0003 Excitation controller input/output module

The Remote Access feature allows device access and control from local or remote locations by using MODBUS as application protocol. The communication can be performed either via RS485 or Ethernet. UNITROL 1020 More information about the connection possibilities can be found in Chapter 3.3.9 – Communication Ports.
Basic features and advantage of Remote Access
 Configuration of parameters and I/O signals.
 Measurement reading.
 Setpoint adjustment and PID tuning.
 Possibility to create a custom application that uses Remote Access to fully control the device.
 Monitor only and full control possible.
The Remote Access feature is fully interoperable with the CMT1000 software; both interfaces can access and read from the device at the same moment. Control permission (write parameters) is handled automatically by the AVR microcontroller. The Remote Access feature is described in detail in Chapter 3.4.6 – Modbus for Remote Access.

ABB UNITROL 1020 3BHE030579R0003 Excitation controller input/output module

UN1020 has three main communication ports to share several features that can be used in combination to cover the requirements of an application.
 USB is a point-to-point interface that can be used to connect the UNITROL 1020 with a PC and is used by the CMT1000 software to control the device.
 The Ethernet port is used to connect the UNITROL 1020 to a multiple point Ethernet network in order to connect the CMT1000 remotely and to access the UNITROL 1020 by a plant control system in parallel.
 RS-485 is a multi-point interface that could be used for Remote Access (Modbus RTU) or VDC; only one feature can be used at the same time.
 CAN is a multi-point interface used to connect a UN1000-PM40 module and uses the Double Channel feature for setpoint follow-up of the second channel. Only one of the above features can be used at same time. This section describes the hardware and wiring requirements for the communication interfaces. The software features that use these communication interfaces are explained in Chapter 3.4 Software.

Voltage Matching is a function from the Synchronization software (Chapter 3.4.2.7) but included in the AVR basic software package. When Voltage Matching is activated, the generator voltage setpoint is adjusted to match UM with UNET, also during Synchronization; however there is no Fbias output. More information about Voltage Matching can be found in Chapter 3.4.2.7 – Synchronization (SYNC). 3.4.2.7 Synchronization (SYNC)
The automatic synchronization of a synchronous machine with the Line is achieved using the optional integrated synchronizing function. By setting a few simple parameters, UNITROL 1020 supplies the corresponding control signals for the speed governor and closes the circuit breaker. Analog speed correction Fbias is given out from the UNITROL 1020 analog output to the speed governor control summing point (not as pulse). This signal represents the difference of network NOMINAL and network ACTUAL frequency. The reference (setpoint) value for the speed governor must be nominal (50 or 60 Hz) and the Fbias given by UNITROL 1020 will drive the speed close to actual network frequency. As an alternative, UNITROL 1020 supports digital increase / decrease signals towards the governor control.

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