VFD Control Panels (Variable Frequency Drive Control Panels)

VFD Panels are designed to control the speed and torque of electric motors by varying input frequency and voltage to motors. VFD Panels are used as energy saving devices as they adjust motor speed under no load conditions or as required by the process. Such energy cost savings are especially pronounced in variable torque centrifugal fan and pump applications where there is large power reduction for a relatively small reduction in speed. We design and manufacture a diverse range of VFD panels for varied applications (closed-loop and open-loop applications).

A VFD Panel (Variable Frequency Drive Panel) is an electrical control panel that houses a VFD (Variable Frequency Drive) used to control the speed and torque of AC motors by varying the frequency and voltage supplied to the motor. It offers precise motor control, energy savings, and reduced mechanical stress on equipment.

• Main Components of an VFD Panel

Component	Function
VFD (Drive Unit)	Converts fixed AC to variable AC for motor speed control
Input MCCB/MCB	Protects the panel from overcurrent or short circuits
EMI/RFI Filters	Reduce electrical noise and harmonics
Line Reactors / AC Chokes	Protect VFD and reduce harmonics on input side
Output Reactors	Protect motor winding and VFD from voltage spikes
Bypass Contactor (optional)	Allows motor to run directly on mains in case of VFD failure
Cooling Fan and Louvers	Ensures proper heat dissipation
HMI / Keypad	Local control and monitoring of motor / VFD
PLC / Control Relays	For automation, interlocks, and remote operation
Meters and Indicators	Voltage, current, frequency, and fault status
CTs & Energy Meters	For monitoring and protection (optional)

• Design Considerations

Design Parameter	Notes
Motor rating	Converts fixed AC to variable AC for motor speed control
Load type	Protects the panel from over current or short circuits
Cooling	Reduce electrical noise and harmonics
Panel type	Protect VFD and reduce harmonics on input side
Starting method	Protect motor winding and VFD from voltage spikes
Isolation	Allows motor to run directly on mains in case of VFD failure

• Working Principle
Incoming AC power is fed into the panel.
VFD converts it to DC using a rectifier, then back to AC at variable frequency and voltage via an inverter.
Output goes to the motor, allowing speed and torque control.
Control logic (manual, auto, PID) governs operation based on field signals or process needs.
• Protections in VFD Panel
Overload / overcurrent
Short circuit
Overvoltage / undervoltage
Ground fault
Motor stall / jam detection
Phase loss / phase reversal
Overtemperature (drive and motor)
• Protections in VFD Panels
Overload / overcurrent
Short circuit
Overvoltage / undervoltage
Ground fault
Motor stall / jam detection
Phase loss / phase reversal
Overtemperature (drive and motor)
• Benefits of VFD Panels
Up to 60% energy savings in fan and pump applications
Soft start and stop reduce mechanical wear
Extended motor life and reduced maintenance
Precision in speed control improves process efficiency
Can reduce starting current up to 80% compared to DOL starters.
• Standards & Compliance
ISO 9001
CPRI Approved

• We offered VFD panels equipped with VFD drives from reputable manufacturers, including Siemens, ABB, Delta, Danfoss, Mitsubishi, Fuji, and Yaskawa, based on customer recommendations
• Our range includes VFD panels ranging from 0.5HP to 400HP
• Additionally, we offer independent communication to each VFD drive, connecting to PLC/DCS/SCADA through communication protocols such as TCP/IP, Profinet, Profibus, Modbus
• Our VFD panels are tailored for various applications, including chiller, AHU, conveyor, blower, pump, and crane systems.
• AHU / Chiller Control
• Pump / Motor / Blower Speed Control
• Reactor Control
• Converyor / Crane System
• Remote / Local / Bypass Control Options
• 1-400 HP (0.7457KW-298.28KW) drive panel
• Siemens / AB / Danfoss / Mitsubishi / ABB/ Yaskawa / Delta