7-8
Functions Related to Protection,
Warning and Various Output Signals
This section describes the protection functions such as warning signals.
7-8-1
Current Limit/Overload Prevention Control/Overload Warning
Current limit
If the output current of the inverter becomes equal to or above the current limitation level, the output
frequency is controlled to prevent the engine from stalling.
• It is enabled when “0: IM V/f control,” “1: IM Dynamic torque vector control without speed sensor,”
“3: IM V/f control with speed sensor” or “4: IM Dynamic torque vector control with speed sensor” is
selected for Drive Control Selection (F42/A14).
Select the operation of this function at 1st Overload Protect Function Selection (F43)/2nd Overload
Protect Function Selection (E146).
At 1st Overload Protect Level (F44)/2nd Overload Protect Level (E147), set an operation level with the
inverter rated output current value as 100%.
If this function is operated while the inverter is accelerating, the acceleration time becomes longer than
the set time.
The lower limit value of the frequency when the current limitation is operated can be set at Low Fre-
quency during Protecting Overload (H64), but generally, there is no need to change the settings. Be-
sides current limitation, Low Frequency during Protecting Overload (H64) is also applicable to torque
limitation and overload prevention control.
Parameter No. Function name Data
Default da-
ta
Unit
F43/E146
1st Overload Protect Function
Selection/2nd Overload Pro-
tect Function Selection
0: Disable
1: Enable at constant speed (Disa-
ble during ACC/DEC)
2: Enable during ACC/constant
speed operation
2 -
F44/E147
1st Overload Protect Level/2nd
Overload Protect Level
20 to 200%
100% = Rated output current of in-
verter (Default: 180% for HHD
mode and 130% for ND mode)
180 %
H64
Low Frequency during Protect-
ing Overload
0.0: Depends on 1st Frequency
Lower Limit (F16) and 2nd Fre-
quency Lower Limit (E1
18)
0.1 to 590.0 Hz
1.6 Hz
Example case where overload limit function is activated during acceleration (F43/E146 = 2)
7 Other Functions
7-82
M1 Series Standard Type User's Manual (I669)
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