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

To change the parameter setting

To store the entered data and factory stored data

To display the data direction of rotation forward / REV

To display the data status of frequency and current

Back e.m.f

Field current

Terminal voltage

Armature current