Function Application
‑666‑
Related parameters
Para.
No.
Function Default
Value Range Description
F9‑00
AC drive overload
protection
0
0: Disabled
1: Enabled
Used to enable or disable the motor overload
protection function. The AC drive judges whether the
motor is overloaded based on the inverse time‑lag
curve. When motor overload is detected, the AC drive
reports an overload fault.
0: Disabled
Motor overload protection is disabled. When this
parameter is set to 0, install a thermal relay upstream
the motor for protection.
1: Enabled
Motor overload protection is enabled.
F9‑01
Motor overload
protection gain
1.00 0.20 to 10.00
The value of motor overload protection gain is
calculated according to the percentage of time during
which the motor runs continuously at a certain overload
point without reporting an overload fault.
This parameter is used to adjust the actual overload
fault report time of the AC drive when motor overload
occurs.
F9‑02
Motor overload pre‑
warning coefficient
80% 50% to 100%
The value of motor overload pre‑warning coefficient is
calculated according to the percentage of time during
which the motor runs continuously at a certain overload
point without reporting overload pre‑warning. This
function is used to send a pre‑warning signal to the
control system through a DO terminal before the motor
overload protection is triggered.
This signal is used to determine how long in advance to
send the pre‑warning signal before the motor overload
protection is triggered. A larger coefficient means later
transmission of the pre‑warning signal.
When the accumulative output current of the AC drive
exceeds the product of overload time (value Y on the
inverse time lag curve of motor overload protection)
multiplied by the motor overload pre‑warning
coefficient (F9‑02), the multi‑functional DO terminal of
the AC drive outputs a motor overload pre‑warning
signal.
3.7.6 Load Loss Protection
You can set the ten thousands position of F9‑51 to enable load loss detection. The AC
drive takes the load loss protection action after running at an output current below
the load loss detection level (F9‑64) continuously for a period of the load loss
detection time (F9‑65). Once the load recovers during protection, the AC drive
accelerates to the frequency reference.
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