Hoists

Elevators

Conveyors

Centrifugal pumps

Produces required firing current to the firing circuit

Provides variable voltage to the field winding of motor

Provides a constant voltage to the field winding of motor

Provides a constant voltage to the armature of the motor

Not suitable for high speed operation

More complex with a single power conversion

More expensive than AC drive for high capacity motor

Installation of DC drives is more complicated

Indicate the status of drive

Monitor the parameter of AC drive

Indicate the display error in reading

Indicate the incorrect operation of BOP

Press ON - REV -ON

Press OFF - REV - ON

Press ON - OFF - REV -ON

Press ON -REV - OFF -ON