MD380 User Manual Desc
ription of Function Codes
- 199 -
Group F9: Fault and Protection
Function Code Parameter Name
Setting Range
Default
F9-00 Motor overload protection
0: Disabled
1: Enabled
1
F9-01 Motor overload protection gain 0.20–10.00 1.00
)
The AC drive judges whether the motor is overloaded according to the inverse time-lag
curve of the motor overload protection.
The shortest time for reporting the motor overload fault is two minutes. If adjustment of the
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overload current and time curve.
Figure 6-25 Motor overload current and time curve
2YHUORDGWLPH
(minutes)
Current (percentage of
rated motor current)
115% 125% 135% 145% 155% 165%
175%
80
40
15
5
2
For example, the motor overload fault needs to be reported after the motor runs at 120%
of the rated motor current for 30 minutes. The 30-minute motor overload current Ix is
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Seen from the preceding curve, the 30-minute overload current is between 125% and 135%
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7KHQWKH)LVREWDLQHGIURPIRUPXOD) ,[
Set F9-01 properly based on the actual overload capacity. If the value of F9-01 is set too
large, damage to the motor may result because the motor overheats but the AC drive does
not report the alarm.
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