Delta VFD (Variable Frequency Drive)
Advanced Motor Control Solutions by Jai Krishna Bearing House
Authorized Distributor of Delta with Dedicated Technical Support Team
In modern industries, energy efficiency, smooth motor operation, and machine safety are very important. One of the most reliable solutions for motor speed control is a Delta VFD (Variable Frequency Drive). At Jai Krishna Bearing House, we are proud to be an Authorized Distributor of Delta, supplying genuine Delta VFDs with full warranty support and a strong technical team for customer assistance.
We not only supply products — we provide complete technical support, selection guidance, installation help, and after-sales service to ensure our customers get maximum performance and long life from their motors and machines.
About Delta Electronics
Delta Electronics is a globally trusted brand in industrial automation and power electronics. Delta is known for manufacturing high-quality AC drives, PLCs, HMIs, servo systems, power supplies, and industrial automation products.
Delta VFDs are designed using advanced control technology, high-efficiency power components, and strong protection systems, making them suitable for heavy-duty industrial environments.
What is a Delta VFD?
A Variable Frequency Drive (VFD) is an electronic device used to control the speed and torque of an AC induction motor by changing the frequency and voltage of the power supplied to the motor.
Basic Working Principle
A Delta VFD works in three main stages:
Rectifier Section
Converts incoming AC supply into DC.
DC Bus Section
Filters and stores DC voltage using capacitors.
Inverter Section
Converts DC back into controlled AC with variable frequency.
By changing the output frequency (Hz), the motor speed changes according to the formula:
Motor Speed (RPM) = (120 × Frequency) / Number of Poles
This allows smooth speed control from zero to full speed.
Key Technical Features of Delta VFD
1. Multiple Control Modes
Delta VFD supports:
V/F Control (Voltage/Frequency Control)
Sensorless Vector Control (SVC)
Field Oriented Control (FOC) in advanced models
These control methods provide:
High starting torque (up to 150–200%)
Stable speed under load changes
Accurate speed regulation
Smooth acceleration and deceleration
2. Wide Power Range
Delta VFD is available in different power ratings:
0.2 kW to 500 kW and above (depending on series)
Single-phase 230V
Three-phase 415V
Medium voltage options in industrial applications
This makes it suitable for small machines as well as heavy industrial applications.
3. High Overload Capacity
Typical overload rating:
150% for 60 seconds
180% for 3 seconds (heavy-duty models)
This ensures stable operation in high starting torque applications like crushers, mixers, conveyors, and hoists.
4. Built-in PID Controller
Delta VFD includes a built-in PID control function which helps in:
Maintaining constant water pressure
Flow control in pumps
Temperature control
HVAC system management
This reduces the need for external PLC in basic automation systems.
5. Communication & Networking
Delta VFD supports various communication protocols:
Modbus RTU (standard)
CANopen
Profibus (optional)
Ethernet/IP (selected models)
This allows easy integration with:
PLC systems
HMI panels
SCADA software
Industrial automation networks
6. Protection Features
Delta VFD is equipped with advanced safety protections:
Overcurrent protection
Overvoltage protection
Undervoltage protection
Overload protection
Short circuit protection
Overtemperature protection
Earth fault detection
These protections increase motor life and reduce downtime.
Popular Delta VFD Series
1. Delta VFD-M Series
Compact size
Easy installation
Suitable for small machines
Power range up to 7.5 kW
2. Delta VFD-EL Series
Built-in brake chopper
Sensorless vector control
Suitable for conveyors and packaging machines
3. Delta VFD-E Series
Built-in PLC function
Multi-step speed control
Communication support
Power range up to 75 kW
4. Delta C2000 Series
High-performance drive
Heavy-duty applications
Encoder feedback support
Ideal for cranes, elevators, and CNC machines
5. Delta CP2000 Series
Specially designed for pumps and fans
Energy-saving mode
Multi-pump control
HVAC optimized
Technical Specifications (General Overview)
Parameter Specification
Input Voltage 1 Phase 230V / 3 Phase 415V
Output Frequency 0.1 Hz to 400 Hz
Speed Accuracy ±0.5% (Vector Control)
Overload Capacity 150% for 60 sec
Efficiency Up to 98%
Protection Class IP20 / IP55
Cooling System Forced Air Cooling
Operating Temperature -10°C to 50°C
Applications of Delta VFD
Delta VFD is widely used in:
1. Pumps
Water supply systems
Borewell pumps
Pressure boosting systems
Energy saving in water plants
2. Fans & Blowers
Air handling units
Cooling towers
Ventilation systems
3. Conveyors
Smooth speed control
Soft start & stop
Reduced mechanical stress
4. Compressors
