Chapter 4 Parameters

Pr.24

Reverse Operation Inhibition

Factory Setting: 00

Settings 00 Enable REV operation 01 Disable REV operation

This parameter is used to disable motor rotation in reverse.

Pr.25 Over–Voltage Stall Prevention

Settings 115V/230V series

330-450Vdc

Factory Setting: 390

 

460V series

660-900Vdc

Factory Setting: 780

 

575V series

825-1025Vdc

Factory Setting: 975

 

00 disable

 

 

 

 

 

 

During deceleration, the DC bus voltage may exceed its maximum allowable value due to motor regeneration. When this function is enabled, the AC drive will stop decelerating, and maintain a constant output frequency to prevent from over-voltage tripping. Drive will resume deceleration when the voltage drops below the setting for Pr.25.

Note: In applications where inertia is low, over-voltage during deceleration would not occur. When inertia is high, the AC drive will automatically extend the deceleration period. If a faster stop is needed, then a dynamic brake resistor should be used.

 

 

DC bus voltage

 

 

 

Over-voltage

 

 

 

detection

 

 

 

level

 

 

 

time

 

 

 

output

 

 

 

Freq.

 

 

 

Over-voltage Stall Prevention

time

 

 

 

Pr.26

Over-Current Stall Prevention during Acceleration

Unit: 1%

 

 

 

Factory Setting: 150%

 

Settings

20 to 200%

 

 

 

00 disable

 

A setting of 100% is equal to the Rated Output Current of the drive.

 

Revision May 2008, ME14, SW V3.04

4-27

Page 62
Image 62
Delta Electronics VFD-M manual Pr.24 Reverse Operation Inhibition, Pr.26