Chapter 4 Parameters
4-108
Group 6: Protection Parameters
06.00 Over-Voltage Stall Prevention Unit: V
Settings 115V/230V series 330.0 to 410.0V Factory Setting: 390.0
460V series 660.0 to 820.0V Factory Setting: 780.0
0 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.
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.
When the function of over-voltage stall prevention is activated, the deceleration time of the AC
motor drive will be larger than the setting.
When the deceleration time is obstruction in the application, it is not suitable to use this
function. The solution are:
1. moderate increase the deceleration time
2. used with a brake resistor (refer to appendix B for details) to consume the regenerative
energy by heat.
Related parameters: Pr.01.10(Decel Time 1), Pr.01.12(Decel Time 2), Pr.03.00(Multi-function
Output Relay (RA1, RB1, RC1)) and Pr.03.01(Multi-function Output Terminal MO1)
Time
high voltage at DC side
over voltage
detection level
output
frequency
Time
previous deceleration time
Deceleration characteristic
when over voltage stall
prevention enabled
frequency Held
actual time to decelerate to stop when over voltage stall
prevention is enabled
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