Chapter 5 Parameters|VFD-B-P Series
Revision April 2009, SW V1.00 5-65
Group 6: Protection Parameters
06 - 00 Over-Voltage Stall Prevention Unit: 0.1
Settings 660.0 to 820.0V Factory Setting: 780.0
00 Disable Over-voltage Stall Prevention (with brake unit or brake resistor)
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=00) 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.
high voltage at DC side
over-voltage
detection level
output
frequency
time
Deceleration characteristic
when Over-Voltage Stall
Prevention enabled
Frequency Held
time
previous deceleration time
actual time to decelerate to stop when over-voltage
stall prevention is enabled
06 - 01
Over-Current Stall Prevention during Acceleration
Unit: 1
V/f control Settings 20 to 150% Factory Setting: 120
Vector control Settings 20 to 250% Factory Setting: 170
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