SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

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Chapter 4 Explanation of Functions 4.2.30 Overload restriction/overload notice (1) Overload restriction function - The overload restriction function allows you to make the inverter monitor the motor current during acceleration or constant-speed operation and automatically reduce the output frequency according to the deceleration rate at overload restriction when the motor current reaches the overload restriction level. - This function prevents the moment of inertia from excessively increasing during motor acceleration and prevents the inverter from tripping because of overcurrent, even when the load changes suddenly during the constant-speed operation of the motor. - You can specify two types of overload restriction operation by setting functional items "b021", "b022", and "b023" and functional items "b024", "b025", and "b026" separately. - To switch the overload restriction operation between the two settings (setting with b021, b022, and b023 and setting with b024, b025, and b026), assign function "39" (OLR) to an intelligent input terminal. Turn the - OLR signal on and off to switch between the two settings. - The overload restriction level specifies the current at which to trigger the overload restriction function. - The deceleration rate at overload restriction specifies the length of time to decelerate the motor from the maximum frequency to 0 Hz. - When this function operates during deceleration, the acceleration time is prolonged over the set time. When you have selected the sensorless vector control, 0Hz-range sensorless vector control, or vector control with sensor as the V/F characteristic curve selection (see Section 4.2.18) and "03" for "b021" or "b024", the inverter output frequency increases if the current over the overload restriction level flows during the regenerative operation. If the value set as the deceleration rate at overload restriction (b023/b026) is too small, the inverter automatically decelerates the motor even during acceleration because of the overload restriction, and may trip because of the overvoltage caused by the energy regenerated by the motor. If this function operates during acceleration and the output frequency cannot reach the target frequency, try to make the following adjustments: - Increase the acceleration time. (See Section 4.2.8.) - Increase the torque boost setting. (See Section 4.2.19.) - Increase the overload restriction setting (b022/b025). Item Function code Data or range of data Description 00 Disabling the overload restriction 01 Enabling the overload restriction during acceleration and constant-speed operation Overload Enabling the overload restriction during restriction b021/b024 02 constant-speed operation operation mode Enabling the overload restriction during 03 acceleration and constant-speed operation (increasing the frequency during regenerative operation) Overload restriction setting Deceleration rate at overload restriction b022/b025 b023/b026 "Rated current x 0.5" to "rated current x 2.0< x 1.8>" (A) 0.1 to 30.0 (s) Current at which to trigger the overload restriction Deceleration time to be applied when the overload restriction operates Terminal function C001 to C008 39 Terminal to switch the overload restriction setting (NOTE):applied for 75 to 150kW Overload restriction level b022/b025 Output current Related code b021: Overload restriction operation mode b022: Overload restriction setting b023: Deceleration rate at overload restriction b024: Overload restriction operation mode (2) b025: Overload restriction setting (2) b026: Deceleration rate at overload restriction (2) C001 to C008: Terminal [1] to [8] functions C021 to C025: Terminal [11] to [15] functions C026: Alarm relay terminal function C040: Overload signal output mode C041: Overload level setting C111: Overload setting (2) Deceleration according to the deceleration rate at overload restriction Maximum frequency A004/A204/A304 Target frequency F001 Inverter output frequency b023/b026 4 - 40
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 Enabling the warning output during Overload signal output 00 C040 acceleration, deceleration, and constant mode 01 Enabling the warning output during constant 0.0 Disabling the warning output Specifying the current at which to output the Overload level setting C041 0.1 to "2.0 x rated 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 current" (A) (NOTE) :applied for 75 to 150kW Overload restriction setting b022/b025 Overload level setting C041/C111 Specifying the current at which to output the OL2 signal (overload notice advance signal (2)) Output current OL/OL2 output 4.2.31 Overcurrent restraint Related code The overcurrent restraint function allows you to restrain the b027: Overcurrent suppression enable 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 00 Disabling the overcurrent restraint b027 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. 4 - 41
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HITACHI INVERTER SJ700-2 SERIES INS
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Safety Instructions Safety Instruct
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Safety Instructions 3. Operation !
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Safety Instructions 10. Distributio
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Contents Chapter 1 Overview 1.1 Ins
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Contents 4.2.30 Overload restrictio
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Chapter 5 Error Codes 5.1 Error Cod
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Chapter 5 Error Codes Name Gate arr
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Chapter 5 Error Codes 5.1.2 Option
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Chapter 7 Specifications 7.1 Specif
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Chapter 7 Specifications (3) Common
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Chapter 7 Specifications SJ700-150
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Chapter 7 Specifications SJ700-750
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Chapter 8 List of Data Settings 8.1
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Chapter 8 List of Data Settings 8.4
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Appendix Upgrading from the SJ300 S
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Index A B C a/b....................
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Index O P O........................
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SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

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