8-8
Functions Related to Protection,
Warning and V
arious Output Signals
This section describes the protection functions such as warning signals.
8-8-1
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 (3004Hex-2BHex/3009Hex-0FHex).
Select the operation of this function at 1st Overload Protect Function Selection (3004Hex-2CHex)/2nd
Overload Protect Function Selection (301FHex-2FHex).
At 1st Overload Protect Level (3004Hex-2DHex)/2nd Overload Protect Level (301FHex-30Hex), 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 (3008Hex-41Hex), but generally, there is no need to change the
settings. Besides current limitation, Low Frequency during Protecting Overload (3008Hex-41Hex) is al-
so applicable to torque limitation and overload prevention control.
Parameter No. Function name Data
Default da-
ta
Unit
3004Hex-2CHex/
301FHex-2FHex
1st Overload Protect Function
Selection/
2nd Overload Protect Function
Selection
0: Disable (Current limiter
does not work.)
1: Enable at constant
speed (Disable during
ACC/DEC)
2: Enable during ACC/
constant speed operation
2 -
3004Hex-2DHex/
301FHex-30Hex
1st Overload Protect Level/
2nd Overload Protect Level
20 to 200
(The data is interpreted as
the rated output current of
the inverter for 100%.)
180 %
3008Hex-41Hex
Low Frequency during Protect-
ing Overload
0.0: Depends on
3004Hex-1
1Hex/
301FHex-13Hex (1st Fre-
quency Lower Limit/2nd
Frequency Lower Limit)
0.1 to 590.0
1.6 Hz
8 Other Functions
8-71
M1 Series EtherCAT Type User’s Manual (I670)
8-8 Functions Related to Protection, Warning and Various Output Signals
8
8-8-1 Current Limit/Overload Prevention Control/Overload Warning
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