Description of Function Codes
MD280 User Manual
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AC drive. The larger the value is, the greater the overcurrent suppression capacity will be. In
the prerequisite of no overcurrent occurrence, set FB-05 to a small value. When the inertia
is very small, set this parameter to a value smaller than 20.
For small-inertia load, the value should be small. Otherwise, the system dynamic response
will be slow. For large-inertia load, the value should be large. Otherwise, the suppression
result will be poor and overcurrent fault may occur.
If the overcurrent stall gain is set to 0, the overcurrent stall function is disabled.
Figure 6-25 Diagram of the overcurrent stall protection function
Output
current
Output
frequency Hz
Set
frequency
Overcurrent stall
protective current
Time t
Time t
Acceleration
process
Deceleration
process
Constant-
speed process
Function Code Parameter Name Setting Range Default
FB-07 Short-circuit to ground upon power-on
0: Disabled
1: Enabled
1
It is used to determine whether to check the motor is short-circuited to ground at power-on
of the AC drive. If this function is enabled, the AC drive's UVW will have voltage output a
while after power-on.
Function Code Parameter Name Setting Range Default
FB-08 Protection upon off-load
0: Disabled
1: Enabled
0
If this function is enabled, the output frequency of the AC drive is 7% of the rated motor
frequency after the load the AC drive becomes 0. After the load restores, the AC drive run at
the set frequency.
Function Code Parameter Name Setting Range Default
FB-09 Power dip ride-through function
0: Disabled
1: Enabled
0
FB-10
Power dip ride-through frequency
decline rate
0.00 Hz/s to F0-04/s 10.00 Hz/s
FB-11
Voltage rise judging time of power
dip ride-through
0.00–100.00s 0.50s
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