Delta Electronics VFD007S23A User Manual

Chapter 5 Parameters|VFD-S Series 

5-12

 

Revision August 2006, SE08, SW V2.61

  Speed Search 

Windmill, winding 
machine, fan and all 
inertia loads 

Restart free-
running motor 

Before the free-running motor is 
completely stopped, it can be restarted 
without detection of motor speed. The 
AC motor drive will auto search motor 
speed and will accelerate when its 
speed is the same as the motor speed.

8-06 

8-07 

 

  DC Braking before Running 

When e.g. windmills, 
fans and pumps rotate 
freely by wind or flow 
without applying power 

Keep the free-
running motor at 
standstill. 

If the running direction of the free-
running motor is not steady, please 
execute DC braking before start-up. 

8-00 

8-01 

8-17 

 

  Multi-step Operation 

Conveying machinery 

Cyclic operation by 
multi-step speeds. 

To control 7-step speeds and duration 
by simple contact signals. 

4-04~4-08 

5-00~5-06 

 

  Switching acceleration and deceleration times 

Auto turntable for 
conveying machinery 

Switching 
acceleration and 
deceleration times 
by external signal 

When an AC motor drive drives two or 
more motors, it can reach high-speed 
but still start and stop smoothly. 

1-09~1-12 

4-04~4-08 

 

  Operation Command 

General application 

Selecting the 
source of control 
signal 

Selection of AC motor drive control by 
external terminals, digital keypad or 
RS485. 

2-01 

4-04~4-08