Overcurrent Restraint (B027) - Hitachi NES1-004SB Quick Reference Manual

Chapter 7 Explanation of Functions
(2) Overload nitice function
The overload notice function allows you to make the inverter output an overload notice signal before
tripping because of overload.
You can use this function effectively to prevent the machine (e.g., a conveyor)driven by the inverter from
being overloaded and prevent the conveyor from being stopped by the overload protection of the inverter.
To use this function, assign function "03" (OL) to one of the intelligent output terminal [11] (C021) and the
alarm relay terminal (C026).
Item
Overload signal output
mode
Overload level setting
Overload restriction setting
Overload level setting
Output current
7.8.4 Overcurrent restraint [b027]
The overcurrent restraint function allows you to restrain the overcurrent that can occur when the output
current sharply increases because of rapid acceleration.
You can enable or disable the function by setting the overcurrent suppression enable (b027).
Item
Overcurrent
suppression enable
Note: When using the inverter for a lift, disable the overcurrent restraint function. If the overcurrent
restraint functions during the lift operation, the lift may slide down because of insufficient torque.
Note: When an acceleration time is extremely short for the load, overcurrent trip may occur.In this case
please adjust an acceleration time.
Note: In the case of Disabling the overcurrent restraint, may become Inverter Trip at the time of
Overcurrent restraint function movement depending on a motor.
Function code Data or range of data
C040
C041/C241
b022/b222/b025
C041/C241
OL output
Function code Data or range of data
b027
Enabling the warning output during
00
acceleration, deceleration, and constant
01 Enabling the warning output during constant
0.0 Disabling the warning output
0.0 to "2.0 x rated Specifying the current at which to output the
current" (A) OL signal (overload notice advance signal.
00 Disabling the overcurrent restraint
01 Enabling the overcurrent restraint
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Description
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