Bianco NXT FlexiSolar-75 7.5kW Variable Speed Drive Controller with Hybrid AC/DC Convertor

The NXT FLEXI-SOLAR pump controller is a variable speed drive designed for three-phase asynchronous motors and permanent magnet synchronous motors. The controller provides motor soft-start, speed control, fault detection and motor protection.

The incoming power source can be DC, AC or a combination of both. High-voltage DC power from a solar array is converted into AC power to drive the pump. When the solar energy drops, the controller can automatically switch to a backup AC power source, such as generator or battery storage In situations of poor power supply (low solar irradiation or ‘brown’ power) the controller adjusts to maintain the output voltage and decreases the pump speed to match the available energy, protecting the system components from harm.

Typically, the NXT FLEXI-SOLAR pump controller will run when there is a demand for water and sufficient energy is available. When a water demand is detected, the controller slowly increases the motor speed while gradually increasing the motor voltage. The motor temperature and starting current of the solar water pump system are lower than DOL starting, extending the life expectancy of the motor.

Performance of the system is continuously monitored to detect abnormal conditions. In
many cases, the controller will provide compensation as needed to maintain uninterrupted running of the system. If there is a possibility of equipment damage, NXT FLEXI-SOLAR will protect the system and display the fault status. Pumping will automatically resume after the fault cause is eliminated.

APPLICATIONS

• Off-grid pumping
• Combining Solar DC and locally generated AC power to
  reduce running costs of ICE power generation
• Powering standard 3 phase pumps with asynchronous
  motors

FEATURES

• Hybrid AC/DC Controller
• Optimised pump performance - Solar Maximum Power Point Tracking (MPPT}
• Soft start, low motor start current.
• Multi-pump control. 1 master and up to 5 auxiliary controllers

In-built Pump Protections:

The controller monitors the system and automatically shuts down when:

• The source water level is low
• The destination is full and further water is not required
• The pump is blocked or overloading.
• High voltage surge
• Low voltage input
• Motor phase loss
• Short circuit
• Controller internal over-temp

MORE FEATURES

Controller Overheating Monitoring
The controller is designed to run at full power up to ambient temperatures of 45°C. At
temperatures above 45°C, the controller reduces the carrier frequency (switching frequency of IGBT) to maintain operation as much as possible.

Water level control 
Two optional water level detection devices (switch or probe) can be connected to provide additional control of the pump. Installed at the source, this prevents the pump running without water present. A float switch or probe installed at the destination OR a pressure switch in the discharge line will prevent the pump from running when there is no water demand.

TECHNICAL SPECIFICATIONS