|Construction Type||Compartmentalize Non- Compartmentalize/Cubical|
|Type||Manual VFD Panel Auto VFD Panel|
|Max. rated of VFD||400KW|
|Rated operated voltage||440V|
|Degree of Protection||Up to IP54|
|Ambient temp||Design Ambient temp. standard 40°C Operated 45°C & 50°C|
|Inspection and Testing||Routine Test Control/Interlock Test Continuity Test Mechanical endurance Test|
|Application||Modulated type load Process plant Treatment plant Motor-driven machinery|
|Fabrication||Ms Crca Sheet Steel or Ss304 Structure, Door, Cover: 1.6 Mm Thick Gland Plate: 3mm Thick|
|Component selection||Drive selection basis on their rating and application, input choke and output choke selection basis|
|Feature||Manufacturers across the globe capitalize on AC variable frequency drive technology to save money|
When a VFD starts a motor, it initially applies a low frequency and voltage to the motor. The starting frequency is typically 2 Hz or less. Starting at such a low frequency avoids the high inrush current that occurs when a motor is started by simply applying the utility (mains) voltage by turning on a switch. When VFD starts, the applied frequency and voltage are increased at a controlled rate or ramped up to accelerate the load without drawing excessive current.
This starting method typically allows a motor to develop 150% of its rated torque while drawing only 50% of its rated current. When a motor is simply switched on at full voltage, it initially draws at least 300% of its rated current while producing less than 50% of its rated torque. As the load accelerates, the available torque usually drops a little and then rises to a peak while the current remains very high until the motor approaches full speed. A VFD can be adjusted to produce a steady 150% starting torque from standstill right up to full speed while drawing only 50% current.