Alpha 6000S series User Manual page 160

Adjustment can be determined according to the following formula:
Motor Overload Protective Coefficient Value =
Among it, "Allowed Max. Load Current" is the rating current of motor generally.
For the motor with the better heat resistance, the value can be increased by a little (e.g. 10%); for the motor with the
weaker heat resistance, the value can be decreased by a little.
 Tips:
When the rating current of motor doesn't match with that of frequency inverter, the motor can be protected
effectively by setting the value of Pd.05. When protection acts, PWM will be blocked and OL1 fault will be
reported.
Pd.06 Pre-overload detection level
Pd.07 Pd.07 Pre-overload detection time
Notes:

The overload pre-alarm detection level (Pd.06) defines the current threshold of overload pre-alarm action. Its
set value corresponds to the percentage of the rating current of frequency inverter.
 The overload pre-alarm detection time (Pd.07) defines that the overload pre-alarm signal OLP2 will be given
out after the output current of frequency inverter keeps larger than the overload detection level (Pd.06) for
certain time continuously.

Overload pre-alarm state effective means that the working current of frequency inverter is over the overload
detection level and its duration time is over the overload detection time.
159
Time
50%
1 min
100%
Figure. 5-13-1 Motor overload protection curve
Rating Output Current of Frequency Inverter
Output current
Detect time
Action
Figure. 5-13-2 Overload pre-alarm function
Chapter 5 Detailed Function Introductions
Motor overload
protective
100%
coefficient
Output current
200%
Allowed Max. Load Current
Setting range: 20.0~200.0% [160.0%]
Setting range: 0.0~60.0s [60.0s]
Detect time
Enabled
×100%
Detect threshold
Time
Time