Operating Instructions

Descriptions of Parameter Settings
Descriptions of Parameter Settings
162 | 443
Fig. 67:
Pr.
Explanation
Settings
Default
06-01
Over-voltage stall prevention
0: Disable
115V/230V models: 0.0 to 390.0 Vdc
460V models: 0.0 to 780.0 Vdc
575V models: 0.0 to 1000.0 Vdc
380.0
760.0
975.0
● Setting Pr.06-01 to 0.0 disables the over-voltage stall prevention function (connected with braking unit or brake
resistor). Use this setting when braking units or brake resistors are connected to the drive.
● Setting Pr.06-01 to a value > 0.0 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 deceleration time.
● Related parameters:
Pr.01-13, Pr.01-15, Pr.01-17, Pr.01-19 Deceleration Time 1–4, Pr.02-13 Multi-function Output 1 (Relay 1),
Pr.02-16–Pr.02-17 Multi-function Output 2–3 (MO1, MO2), and Pr.06-02 Selection for Over-voltage Stall
Prevention.
Pr.
Explanation
Settings
Default
06-02
Selection for over-voltage stall
prevention
0: Traditional over-voltage stall prevention
1: Smart over-voltage stall prevention
0
● 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 motor’s loading inertia being too high or
drive’s 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.