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6. Inter-drive communication

Inter-drive communication (communication between inverters) are used, for example, when per- forming speed proportional control or load sharing torque control of two or more inverters without using a PLC or computer. The command is instructed by the operation from the master inverter’s panel or analog input, etc.

With the Inter-drive communication function, the master inverter continues to transmit the data se- lected by the parameters to all the slave inverters on the same network. The master inverter uses the S command for outputting instructions to the slave inverters, and the slave inverters do not re- turn the data. (See chapter 4.2 "Command".) Network construction for a simple synchronized op- eration and speed-proportional operation can be created by this function.

*If the master inverter trips, the slave inverters display the blinking error code “t” and come to a full stop (0Hz).

Restoring the master inverter that has tripped returns the slave inverters to working order.

*With the communication time-out parameters f803 and f804, you can specify what the slave inverters should do (continue to operate, issue an alarm or trip) if a cable is broken or the master inverter is turned off during operation.

*To use the inter-drive communication function, select “TOSHIBA Inverter Protocol” (, =) in the communication protocol selection parameters. “TOSHIBA Inverter Protocol” (, =) is set for communication protocol selection in Shipment setting. (See “3. Communication protocol.”)

<Conceptual illustration>

 

 

 

Master (60Hz)

Slave 1 (50Hz)

Slave 2 (40Hz)

Slave 3 (30Hz)

 

 

 

VF-AS1

VF-AS1

VF-AS1

VF-AS1

Analog input

<Notes>

Speed command can be transmitted but the run / stop signal is not issued. Slave station should have an indi- vidual stop signal or the function to stop the action by the frequency reference. (Setting is necessary for : Operation start frequency, : Operation start frequency hysteresis .)

For continuing the operation by the last received command value in the case of a communication breakdown, communications time-out time () to trip the slave inverters. The master inverter does not trip even though the communication breakdown happens. To trip the master inverter, provide an interlock mechanism by installing an FL fault relay point or the like from the slave side.

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Toshiba RS485, VF-AS1 Series instruction manual Inter-drive communication
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RS485, VF-AS1 Series specifications

The Toshiba VF-AS1 Series represents a significant advancement in the realm of variable frequency drives (VFDs), designed for various industrial applications that demand precision, efficiency, and reliability. With support for RS485 communication, the VF-AS1 Series fosters seamless integration into complex automation systems, making it the perfect choice for modern manufacturing environments.

One of the standout features of the Toshiba VF-AS1 Series is its versatile communication capabilities. The built-in RS485 port allows for easy connectivity with a range of devices, including PLCs (Programmable Logic Controllers) and HMIs (Human-Machine Interfaces). This ensures real-time monitoring and control of motor functions, enhancing operational efficiency and data analysis.

The VF-AS1 Series is engineered with advanced control technologies that provide exceptional motor performance. It incorporates vector control algorithms that optimize torque and speed regulation for both standard and permanent magnet motors. This results in precise motor control across a wide range of speeds and load conditions, ensuring optimum performance and energy savings.

Another noteworthy characteristic is its user-friendly interface. The VF-AS1 features a clear LCD display that allows for easy navigation and configuration. This intuitive design minimizes the learning curve for operators and technicians, facilitating quick setup and adjustments. Additionally, the series supports various programming options, catering to both novice users and experienced professionals.

Energy efficiency is a key priority in the design of the VF-AS1 Series. The drives are equipped with energy-saving features that help reduce overall power consumption and operational costs. With built-in sleep modes and dynamic energy feedback, these drives optimize energy usage based on demand, making them suitable for both constant and variable load applications.

In terms of safety and protection, the VF-AS1 Series incorporates various built-in safeguards, including overvoltage, undervoltage, and overcurrent protection. This comprehensive approach to safety not only protects the drive itself but also ensures the longevity of connected equipment.

Overall, the Toshiba VF-AS1 Series, with its robust feature set, advanced technologies, and focus on energy efficiency, proves to be a reliable choice for a wide range of industrial applications. Its integration of RS485 communication allows for enhanced connectivity and control, making it an excellent solution for modern automation needs.
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