Chapter 12 Description of Parameter SettingsC2000
12.1-06-2
Setting Pr. 06-01 to 0.0 disables the over-voltage stall prevention function (connected with
braking unit or braking resistor). Use this setting when braking units or resistors are connected to
the drive.
Setting Pr.06-01 to a value > 0 enables the over-voltage stall prevention. This setting refers to the
power supply system and loading. If the setting is too low, then over-voltage stall prevention is
easily activated, which may increase the deceleration time.
Related parameters:
Pr. 01-13, Pr. 01-15, Pr. 01-17, Pr. 01-19 Deceleration Time 1–4
Pr. 02-13–Pr. 02-14 Multiple-function Output (Relay 1 and 2)
Pr. 02-16–Pr. 02-17 Multiple-function output (MO 1 and 2)
Pr. 06-02 Selection for Over-voltage Stall Prevention.
Selection for Over-voltage Stall Prevention
Default: 0
Settings 0: Traditional over-voltage stall prevention
1: Smart over-voltage stall prevention
Use this function when you are unsure about the load inertia. When stopping under normal load,
the over-voltage does not occur during deceleration and meet the deceleration time setting.
Sometimes it may not stop due to over-voltage during decelerating to STOP when the load
regenerative inertia increases. In this case, the AC motor drive extends the deceleration time
automatically until the drive stops.
When you set Pr.06-02 to 0, during deceleration the motor exceeds the synchronous speed due
to load inertia. In this case, the motor becomes an electrical generator. The DC BUS voltage may
exceed its maximum allowable value due to motor regeneration in some situations, such as
loading inertia being too high or deceleration time being set too short. When you enable
traditional over-voltage stall prevention and the DC BUS voltage detected is too high, the drive
stops decelerating (output frequency remains unchanged) until the DC BUS voltage drops below
the setting value.
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