Alpha 6000 User Manual page 155

Chapter 5 Parameter Introductions
 Over-current during acceleration or constant speed , reduce frequency: When this
function is valid, if the current goes too high in acceleration and constant speed
occasion, the inverter's output frequency will be reduced to avoid overload and
over-current. Refer to Pd.16 for details.
Output Freq.(Hz)
0
Output current ％
0
Acceleration
Fig. 5-13-3 Acceleration
Pd.06 Over-voltage at stall
function selection
Pd.07 Over-voltage point at
stall
0: Disabled (The proposed option, when braking resistor is mounted)
1: Enabled
Note:
 During deceleration, the motor's decelerate rate may be lower than that of inverter
because of the load inertia. At this time, the motor will feed the energy back to the
inverter, resulting in the voltage rise on the inverter's DC bus. If no measures taken,
the inverter over voltage fault will happen.

If Pd.06 is set to 1 and enabled, during the deceleration, the inverter detects the
middle direct voltage and compares it with the over voltage point at stall defined by
Pd.07. If the middle direct voltage exceeds the stall over-voltage point, the inverter
will stop reducing its output frequency. When the middle direct voltage becomes
lower than the point, the deceleration continues.

When the inverter is in the status of over-voltage at stall, the time last more than 1
minute or press "STOP/RESET" key directly and hold over 2 seconds, then the
inverter will coast to stop.
154
Output Freq.(Hz)
Time(s)
Time(s)
Fig. 5-13-4 constant speed Operation
Range: 0,1【1】
Range:
3004GB/35R5PB and below：110.0~150.0% DC
bus voltage
35R5GB/37R5PB and above：120.0~150.0% DC
bus voltage
【380V:140.0%；220V:120.0%】
0
Output Current(%)
0
Acc/Dec 4
Time(s)
Time(s)