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

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Chapter 4 Explanation of Functions 4.2.91 Deceleration and stopping at power failure (nonstop deceleration at instantaneous power failure) Related code The nonstop deceleration at instantaneous power failure is b050: Controller deceleration and stop on power loss the function making the inverter decelerate and stop the b051: DC bus voltage trigger level during power loss b052: Over-voltage threshold during power loss motor while maintaining the voltage below the overvoltage b053: Deceleration time setting during power loss level when an instantaneous power failure occurs during b054: Initial output frequency decrease during power the inverter operation. loss Integral time setting for nonstop operation at You can select three modes with controller deceleration momentary power failure and stop on power loss (b050). b055: Proportional gain setting for nonstop operation at momentary power failure b056: Integral time setting for nonstop operation at momentary power failure Item Function code Data or range of data Description 00 Disabling the nonstop deceleration function Controller deceleration and stop on power loss b050 01 Enabling the nonstop deceleration function 02 03 DC bus voltage trigger level during power loss b051 0.0 to 1000. (V) Over-voltage threshold during power loss (*1) b052 0.0 to 1000. (V) Deceleration time setting during power loss b053 0.01 to 3600. (s) Initial output frequency decrease during power loss b054 0.00 to 10.00 (Hz) Proportional gain setting for nonstop operation at momentary power failure Integral time setting for nonstop operation at momentary power failure b055 0.00 to 2.55 b056 4 - 84 0.0 to 9.999 / 10.00 to 65.53 Proportional gain at DC voltage constant control(Only when "02" or "03" is specified for b050) Integral time at DC voltage constant control(Only when "02" or "03" is specified for b050) nonstop deceleration at instantaneous power failure (b050=01) - The nonstop deceleration at instantaneous power failure is the function making the inverter decelerate and stop the motor while maintaining the voltage below the overvoltage level (over-voltage threshold during power loss [b052]) when an instantaneous power failure occurs during the inverter operation. - To use this function, remove the J51 connector cables from terminals R0 and T0, connect the main circuit terminals P and R0 to each other, and connect the main circuit terminals N and T0 to each other. Use 0.75 mm2 or heavier wires for the connections. - If an instantaneous power failure has occurred while the inverter is operating the motor and the output voltage falls to the DC bus voltage trigger level during power loss (b051) or less, the inverter reduces the output frequency by the initial output frequency decrease during power loss (b054) once, and then decelerates the motor for the deceleration time setting during power loss (b053). - If the voltage increases to an overvoltage level (exceeding the over-voltage threshold during power loss [b052]) because of regeneration, the inverter enters the LAD stop state until the voltage falls below the overvoltage level. Note1:If the over-voltage threshold during power loss (b052) is less than the DC bus voltage trigger level during power loss (b051), the over-voltage threshold during power loss will be increased to the DC bus voltage trigger level during power loss when the stop level is applied. (However, the stored setting will not be changed.) And, in case b052 is less than the supply voltage (equivalent to rectified DC voltage which is square root 2 times supply AC voltage), when power recovers while this function is activated, inverter will be in the LAD stop status and cannot decelerate. (Stop command and frequency change command are not accepted until deceleration is completed). Be sure to set b052 more than the standard supply voltage. Note2:This nonstop deceleration function cannot be canceled until the nonstop deceleration operation is completed. To restart the inverter operation after power recovery, wait until the inverter stops, enter a stop command, and then enter an operation command. Note3:Setting higher initial out put frequency decrease during powerloss (b054) results in over current trip due to sudden deceleration. Setting lower b054, orlonger deceleration time during powerloss (b053) results in undervoltage trip due to less regeneration power.
Voltage across main circuit terminals P and N VPN(V) b052 b051 Undervoltage level Output frequency (Hz) b054 b053 Chapter 4 Explanation of Functions DC voltage constant control during nonstop operation ( ) at momentary power failure (b050 = 02: no restoration, b050 = 03: restoration to be done) - If momentary power failure occurs or the main circuit DC voltage drops during inverter operation, the inverter decelerates the motor while maintaining the main circuit DC voltage at the level specified as the target nonstop operation voltage at momentary power failure (0V-LAD stop level) (b052). - This function starts operating when all the following conditions are met: -- "02" or "03" has been specified for b050. -- The inverter is running. (This function does not operate if the inverter has been tripped, is in undervoltage status or stopped.) -- The control power fails momentarily or the main circuit DC voltage drops to the DC bus voltage trigger level during power loss (b051) or less. - This function operates when the conditions above are met even if the J51 connector cables have been disconnected from terminals R0 and T0, and cables are connected from main circuit terminal P to terminal R0, and from main circuit terminal N to terminal T0. - If momentary power failure only lasts a short time, the inverter can continue operation without stopping its output. Conversely, if momentary power failure causes undervoltage, the inverter stops its output immediately and ends the operation of this function. When power is subsequently restored, the inverter operates according to the selection of restart mode (b001). - When "03" is specified for b050, the inverter can be restored to normal operation if the input power is recovered from momentary power failure before the inverter stops its output. The inverter, however, may decelerate and stop the motor if a specific setting has been made for b051. The table below lists the differences in operation according to the setting of b051. b050 b051 Operation Decelerating and stopping the motor (DC voltage 02 (No b052 > Main circuit DC voltage at input power recovery constant control) (Example 1) restoration) b052 < Main circuit DC voltage at input power recovery Decelerating and stopping the motor (Example 2) Decelerating and stopping the motor (DC voltage 03 (Restoration b052 > Main circuit DC voltage at input power recovery constant control) (Example 1) to be done) b052 < Main circuit DC voltage at input power recovery Decelerating and stopping the motor (Example 2) - When this function operates and the inverter decelerates and stops the motor, the motor is forcibly stopped even if the FW signal is on. To restart the motor, turn on the FW signal again after confirming the recovery of inverter input power. Note 4: Each of the values of b051 and b052 must be the undervoltage 210V(200V class),410V(400V class)level or more. This function does not operate when undervoltage occurs. The value of b051 must be less than that of b052. When b051 is much higher proportional gain (b055) results in overcurrent by rapid acceleration after this function operates. Note 5: When "02" or "03" is specified for b050, PI control is performed so that the internal DC voltage is maintained at a constant level. - Setting a higher proportional gain (b055) results in a faster response. However, an excessively high proportional gain causes the control to diverge and results in the inverter easily tripping. - Setting a shorter integral time (b056) results in a faster response. However, an excessively short integral time results in the inverter easily tripping. - Setting a lower proportional gain (b055) results in undervoltage trip due to a voltage drop immediately after starting this function. (Example 1) (Example 2) Voltage across main circuit terminals P and N Vpn(V) DC voltage across main circuit Recovery of input power Output frequency (Hz) Period of DC voltage constant control b052 b051 Time Time Time Voltage across main circuit terminals P and N Vpn(V) Output frequency (Hz) DC voltage across main circuit Recovery of input power Period of DC voltage constant control b050=03(running) b052 b051 Time b050=02,03 (decelerate to stop) Time b050=02 (decelerate to stop) Time Recovery of input power 4 - 85 Recovery of input power
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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 Precautions Con
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Safety Instructions Precautions Con
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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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Contents 4.3.15 Speed/position swit
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Chapter 1 Overview This chapter des
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Chapter 1 Overview 1.2 Method of In
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Chapter 2 Installation and Wiring T
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Chapter 2 Installation and Wiring 2
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Chapter 2 Installation and Wiring D
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Chapter 2 Installation and Wiring S
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Chapter 2 Installation and Wiring (
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Chapter 2 Installation and Wiring (
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Chapter 3 Operation This chapter de
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Chapter 3 Operation You can operate
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Chapter 3 Operation 3.2.2 Code disp
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Chapter 3 Operation Key operation a
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Chapter 3 Operation (3) Code/data d
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Chapter 3 Operation 3.3 How To Make
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Chapter 3 Operation ELB 3-phase pow
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Chapter 4 Explanation of Functions
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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 5 Error Codes 3) Error indi
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Chapter 5 Error Codes 5.1.3 Trip co
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Chapter 6 Maintenance and Inspectio
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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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Chapter 8 List of Data Settings AVR
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Chapter 8 List of Data Settings Oth
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Chapter 8 List of Data Settings Cod
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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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