Delta Electronics VFD-S Manual De Usuario

Chapter 5 Parameters|VFD-S Series 

Revision August 2008, SE09, SW V2.61 

5-59

 

 

DC Brake during Start-up is used for loads that may move before AC drive starts, such as 

fans and pumps. These loads may also be moving in the wrong direction.  Under such 

circumstances, DC Brake can be executed to hold the load in position before applying a 

forward motion. 

 

DC Brake during stopping is used to decrease stopping time and also to hold a stopped load 

in position.  For high inertial loads, a dynamic brake resistor may be needed for quick 

decelerations. 

 

Momentary Power Loss Operation Selection 

 

 

 

Factory Setting: d0

 Settings 

d0 

Operation 

stops after momentary power loss 

 

 

d1 

Operation continues after momentary power loss, speed search 
starts with the Master Frequency reference value 

 

 

d2 

Operation continues after momentary power loss, speed search 
starts with the minimum frequency 

 

Maximum Allowable Power Loss Time 

Unit: 0.1

 

Settings 

d0.3 to d5.0Sec 

Factory Setting: d2.0

 

During a power loss, if the power loss time is less than the time defined by this parameter, the 

AC drive will resume operation.  If the Maximum Allowable Power Loss Time is exceeded, the 

AC drive output is then turned off. 

 

Base Block Speed Search 

Unit: 0.1 

 

Settings 

d0.3 to d5.0Sec 

Factory Setting: d0.5

 

When a momentary power loss is detected, the AC drive turns off for a specified time interval 

determined by Pr.8-06 before resuming operation.  This time interval is called Base-Block.  

This parameter should be set to a value where the residual output voltage is nearly zero, 

before the drive resumes operation. 

 

This parameter also determines the searching time when performing external Base-Block and 

fault reset. 

 

Current Limit for Speed Search 

Unit: 1

 Settings 

d30 to d200

％ 

Factory Setting: d150