ABB ACS850-04 drive modules

ABB ACS850-04 drive modules 

Control Signal Processing and Transmission: The RDCU drive control unit receives external control signals, such as commands from the control panel, host computer or other devices. These signals enter the control unit through the digital input interface (e.g. the programmable digital input of X22), and are processed by the internal circuitry and used to control the operating status of the inverter, such as starting, stopping, forward and reverse rotation, speed adjustment and so on. Analogue input signals (e.g. programmable differential current and voltage inputs of X21) can be used to receive external analogue control signals, such as the speed given value, etc., to provide the basis for precise control of the frequency converter. At the same time, the RDCU sends status signals and control signals to external devices via digital output interfaces (e.g. relay outputs X25 - X27) and analogue output interfaces (programmable current outputs of X21) to achieve control and status feedback to external devices.

Power Management: The RDCU can be powered by the power board of the inverter or IGBT power module, or by an external 24V DC power supply. The power supply is connected through connector X34. During the power supply process, it is necessary to ensure that the input voltage is stable within the range of 24V DC ±10% and the maximum current does not exceed 1A (depending on the use of optional modules). The internal circuitry processes and distributes the power supply to provide a stable power supply to all parts of the control unit to ensure its normal operation.

Communication function: High-speed data transmission to the inverter or IGBT power supply module via fibre-optic connection (V57 and V68), following the ABB PPCS (Power Plate Communication System) protocol at a rate of 10 MBd. This connection enables efficient and reliable data interaction and ensures that the DriveControl Unit works in synergy with the other modules. This connection enables efficient and reliable data interaction and ensures that the drive control unit and other modules work together. In addition, the RDCU supports a wide range of fieldbus communications, which can be realised through the corresponding fieldbus adapter modules (e.g. FCAN-01, FDNA-01, etc. mounted on Slot 3) to communicate with different devices to meet the needs of different industrial automation scenarios.

Working together with other components: In the whole inverter system, the RDCU works closely with the motor control and I/O board (RMIO), which processes the specific signals and data for the motor control, while the RDCU provides it with the necessary control instructions and power supply support, and receives information on the motor operating status from the RMIO. At the same time, the RDCU is connected to the control panel (CDP 312R) through the control cable to realise user operation and monitoring of the inverter. The user's operation commands on the control panel are transmitted to the RDCU through the control cable, and the RDCU controls the operation of the inverter according to these commands and feeds back the operation status information of the inverter to the control panel for display.

Safety instructions

Use of Warnings

Warnings alert you to conditions that could result in serious injury or death and/or damage to equipment.

and/or damage to the equipment and tells how to avoid the hazard. Warning Symbols

The following warning symbols are used throughout this manual:

ELECTRICAL WARNING Warns of an electrical hazard that could result in personal injury and/or equipment damage.

Warns of hazards that could cause personal injury and/or equipment damage.

General Warning Warns of conditions other than electrical hazards that could result in personal injury and/or equipment damage.

Warns of other conditions that could cause personal injury and/or equipment damage.

Warns of conditions other than those caused by electricity that could result in personal injury and/or equipment damage.

Warns of electrostatic discharge that could damage equipment.

Safety in installation and maintenance

Electrical safety

These warnings are intended for all who work on the drive, motor cable or motor.

WARNING! Ignoring the following instructions can cause physical injury or death, or

damage to the equipment:

• Only qualified electricians are allowed to install and maintain the drive.

• Never work on the drive, motor cable or motor when main power is applied.

After disconnecting the input power, always wait for 5 min to let the intermediate

circuit capacitors discharge before you start working on the drive, motor or

motor cable.

Always ensure by measuring with a multimeter (impedance at least 1 Mohm)

that:

1. voltage between drive input phases U1, V1 and W1 and the frame is close to

0 V.

2. voltage between terminals UDC+ and UDC- and the frame is close to 0 V.

• Do not work on the control cables when power is applied to the drive or to the

external control circuits. Externally supplied control circuits may cause

dangerous voltages inside the drive even when the main power on the drive is

switched off.

• Do not make any insulation or voltage withstand tests on the drive or drive

modules.

Note:

• The motor cable terminals on the drive are at a dangerously high voltage when

the input power is on, regardless of whether the motor is running or not.

• The brake control terminals (UDC+, UDC-, R+ and R- terminals) carry a

dangerous DC voltage (over 500 V).

• Depending on the external wiring, dangerous voltages (115 V, 220 V or 230 V)

may be present on the terminals of relay outputs (X2) or Safe torque off (X6).

• The Safe torque off function does not remove the voltage from the main and

auxiliary circuits.