Protection Parameters; Over-Voltage Stall Prevention - Delta Electronics AC Motor Drive VFD-EL User Manual

Group 6: Protection Parameters
06.00

Over-Voltage Stall Prevention

Settings 115V/230V series 330.0 to 410.0V
460V series
0
During deceleration, the DC bus voltage may exceed its Maximum Allowable Value due to
motor regeneration. When this function is enabled, the AC motor drive will not decelerate
further and keep the output frequency constant until the voltage drops below the preset value
again.
Over-Voltage Stall Prevention must be disabled (Pr.06.00=0) when a brake unit or brake
resistor is used.
NOTE
With moderate inertia load, over-voltage stall prevention will not occur and the real deceleration time
will be equal to the setting of deceleration time. The AC drive will automatically extend the
deceleration time with high inertia loads. If the deceleration time is critical for the application, a brake
resistor or brake unit should be used.
over-voltage
detection level
Revision August 2008, 2ELE, V1.02
660.0 to 820.0V
Disable Over-voltage Stall Prevention (with brake unit or
brake resistor)
high voltage at DC side
output
frequency
previous deceleration time
actual time to decelerate to stop when over-voltage
stall prevention is enabled
Chapter 4 Parameters|
Deceleration characteristic
when Over-Voltage Stall
Prevention enabled
Unit: 0.1
Factory Setting: 390.0
Factory Setting: 780.0
time
Frequency Held
time
4-67