Chapter 4 Parameters
4-109
06.01
Over-Current Stall Prevention during Acceleration
Unit: %
Settings
20 to 250%
Factory Setting: 170
0:
disable
A setting of 100% is equal to the Rated Output Current of the drive.
During acceleration, the AC drive output current may increase abruptly and exceed the value
specified by Pr.06.01 due to rapid acceleration or excessive load on the motor. When this
function is enabled, the AC drive will stop accelerating and keep the output frequency constant
until the current drops below the maximum value.
When it stalls due to the small motor power or operate with factory setting, please decrease
the setting of Pr.06.01.
When the acceleration time is obstruction in the application, it is not suitable to use this
function. The solution are:
1. moderate increase the acceleration time
2. setting Pr.01.16 (Auto acceleration / deceleration (refer to Accel/Decel time setting)) to 1, 3
or 4.
Related parameters: Pr.01.09(Accel Time 1), Pr.01.11(Accel Time 2), Pr.01.16(Auto
acceleration / deceleration (refer to Accel/Decel time setting)), Pr.03.00(Multi-function Output
Relay (RA1, RB1, RC1)), Pr.03.01(Multi-function Output Terminal MO1) and Pr.06.03(Over-
Torque Detection Mode (OL2))
06.01
Over-Current
Detection
Level
Over-Current Stall
prevention during
Acceleration,
frequency held
output current
setting
frequency
previous acceleration time
actual acceleration time when over-current stall
prevention is enabled
output current
Time
06.02
Over-current Stall Prevention during Operation
Unit: %
Settings
20 to 250%
Factory Setting: 170
0:
disable
The over-current stall prevention during operation function is a protection. When the motor
runs with constant speed, the AC motor drive will decrease the output frequency automatically
when momentary overload.
If the output current exceeds the setting specified in Pr.06.02 when the drive is operating, the
drive will decrease its output frequency by Pr.01.10/Pr.01.12 to prevent the motor stall. If the
output current is lower than (Pr.06.02 setting –rated current X 5%), the drive will accelerate
again by Pr.01.09/Pr.01.11 to catch up with the set frequency command value.
