Delta Electronics VFD-M - Manual (Page 62)

Chapter 4 Parameters|
Revision May 2008, ME14, SW V3.04 4-27
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
time
Over-voltage
detection
level
output
Freq.
time
Over-voltage Stall Prevention
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.