Hitachi SJ700-2 instruction manual Overcurrent restraint

Related code

b027: Overcurrent suppression enable

Chapter 4 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" (OK) or "26" (OL2) to one of the intelligent output terminals [11] to

[15](C021 to C025) and the alarm relay terminal (C026). (Two types of overload notice signal are available for output.)

Item	Function code	Data or range of data	Description
Overload signal output	C040	00	Enabling the warning output during
			acceleration, deceleration, and constant
mode
		01	Enabling the warning output during constant
		0.0	Disabling the warning output
Overload level setting	C041	0.1 to "2.0 x rated	Specifying the current at which to output the
			OL signal (overload notice advance signal
		current" (A)
			(1))
		0.0	Disabling the warning output
Overload setting (2)	C111	0.1 to "2.0 x rated	Specifying the current at which to output the
			OL2 signal (overload notice advance signal
		current" (A)
			(2))

Overload restriction setting b022/b025

Overload level setting

C041/C111

Output current

OL/OL2 output

4.2.31 Overcurrent restraint

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	Function code	Data or range of data	Description
Overcurrent	b027	00	Disabling the overcurrent restraint
suppression enable		01	Enabling the overcurrent restraint

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.

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