Alpha 6000S series User Manual page 161

Chapter 5 Detailed Function Introductions
 Tips:
1. For setting of the overload pre-alarm detection level\detection time, it should be generally ensured that the
pre-alarm occurs earlier than the overload protection action of frequency inverter.
2. Within the overload pre-alarm detection time, if the working current is less than the overload pre-alarm
detection level, the overload pre-alarm detection time inside the inverter will be reset.
Pd.08 Current amplitude limit
0: Invalid
2: Valid
Pd.09 Current amplitude limiting level
Notes:
 When the inverter is running at Acc/Dec or constant speed, there may be a sharp increase in the current,
because of the unmatched of acc time and motor inertia, or the mutation of load torque. In order to control the
output current, when Pd.08 is set to 1 and 2 or 3, the inverter's output frequency may be adjusted
automatically.
 When it is set as 1 or 2 for acceleration or deceleration, if the output current value reaches the current limit
action level Pd.09, the output frequency of frequency inverter will not change until the current is restored to
the normal and the final control current will not be higher than the PD.09 value.
 In the case of stable-speed operation, if Pd.08 is selected as 2, the current value will reach the current limit
action level Pd.09, the frequency inverter will reduce the output frequency according to the deceleration time
4 and restore to the original working state after the current is reduced. If Pd.08 is selected as 1, the output
frequency of frequency inverter will not change.

If Pd.08 is selected as 3, the current value will reach the current limit action level Pd.09 and last for the time
set by Pd.20, then the frequency inverter will reduce the output frequency according to the deceleration time 4
and restore to the original working state after the current is reduced.
 During the process of deceleration, if the frequency inverter is at the state of current limit for over 1min, the
OL2 overload alarm of frequency inverter will be given out and the motor will stop freely; or by pressing the
button of STOP/RESET twice (at the interval not less than 2s), the OL2 overload alarm of frequency inverter
will be given out and the motor will stop freely.
160
Setting range:0~3 [1]
1: Valid during Acceleration and deceleration, invalid in
constant speed Operation
3: Reduce the operation speed in the case of overload
Setting range:80~180% [160%]
Output Freq.(Hz)
0
Output current ％
0
Acceleration
Figure. 5-13-3 Acceleration
T ime(s)
T ime(s)