Model: UNITROL 1020
The ABB UNITROL 1020 product family covers a wide range of applications for voltage regulation tasks in synchronous motors from 100kVA to 80MVA, ensuring stable control of the voltage of the synchronous generator or motor, responding quickly to load changes and maintaining the required voltage level, even in harsh environments.

With more than 40,000 units installed worldwide in various industries, including power plants, Marine systems, diesel-electric locomotives and emergency power systems, UNITROL 1020 is a reliable and vital component for efficient and stable power generation.

The UNITROL 1020 series includes three automatic voltage regulators (AVRs) – UNITROL 1005, 1010 and 1020 – which can be easily combined with automated and electrical systems as well as advanced digital services.

The UNITROL 1020 is also available as part of the precast systems COMPACT and FLEXplus. Conveniently mounted on the backplane, pre-wired, pre-tested and ready for installation, these systems are the ideal solution for fast and efficient projects with a tight schedule.

Key benefits of UNITROL 1020:

Maximize running time
Ensure safe operation of the machine
Ensure the quality of energy delivery
Seamless integration with power plant control systems
Easy to use commissioning and maintenance platform (CMT1000)
Enhancements to ensure a leaner, faster grid compliance process

Switching quantity: Maximum cable length 30 m
9 Power Supply Control (PWM)
Analog quantity:
The maximum cable length is 30 m
10 Communication MCU:
Network voltage measurement UNET 11 Control power input AUX L1-L3
4 Terminal voltage measurement UM 12 Ethernet connection
Maximum cable length 100m
5 Current measurement IM2 13 USB connection
The maximum cable length is 3m
External capacitor ExCap (-) 14 RS-485 connection
The maximum cable length is 500m
Excitation output Ie & Ue 15 CAN connection
The maximum cable length is 3m
Measurement and Control Unit (DSP) 16 Excitation power input
PWR L1–L3

Product packaging
Product packaging contents:
• UNITROL 1000 Series AVR
• Dedicated red USB cable for powering and connecting the AVR. Please keep this USB cable safe.
• Red jumper blocks (3)
• Quick installation guide and test certificate
Ensure that all listed items are included in the product packaging and that the items are not damaged.
Mechanical installation
For more information on mechanical installation, please refer to the user manual.
The AVR must be installed in a dry, dust-free indoor area that does not contain any volatile gases, acid fumes, or similar hazards.
Check the installation area and refer to technical data to ensure:
• The maximum ambient temperature is within the permissible range.
• Vibration is limited and within permitted levels.
• Appropriate level of protection and contamination.
• Suitable EMC environment.

Installation requirements:
• Install the AVR vertically to ensure normal cooling.
• Available space requirements:
• 50mm above AVR
• 20mm below AVR
• AVR 10mm on left and right sides
• Ensure that there is sufficient cooling airflow around the AVR.
• Ensure that other equipment does not blow hot air into the AVR.
• The AVR is designed to be mounted to the mounting board with appropriate hardware.
• Ensure that the ground cable (≥4mm2) is threaded through the mounting hole to secure the frame of the AVR with electrical (PE) ground
Attach to mounting plate. Use toothed washers for good electrical grounding.
Installation steps:
1. Refer to the dimensions of mounting holes.
2. Drill appropriate holes on the mounting plate.
3. Secure the AVR to the mounting plate with a torque of 10Nm using suitable hardware (e.g. M6 screws). Mounting hole
Its diameter is 6.5 mm.
4. Ensure that the mounting plate is properly grounded with the AVR. The mounting plate must be electrically grounded (PE).

UL rating
To use AVR in a UL compliant manner, consider the following:
• Rated electrical power at ambient temperature 55°C
• The highest ambient temperature ranges from 55°C to 70°C. The derating is as follows
• UNITROL 1010’s maximum output capacity: 5A/150V
• UNITROL 1020 Maximum output capacity: 10A/150V
• Use only 60/75°C rated wires
• Suitable for level 2 polluted environment
The ground cable terminal is clearly marked as PE
Excitation input PWRL1, PWRL2, and PWRL3 must be rated at 480Y/277V AC with A maximum of 15 A break
Device protection (AC power supply) or, rated 300V DC, up to 15 A certified grade RK5 fuse protection (straight
Current power supply)