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

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Chapter 4 Explanation of Functions *1 If the inverter trips because of overvoltage or overcurrent while decelerating the motor, the inverter will display error code "E16" (instantaneous power failure), and the motor will start free-running. If this error occurs, prolong the deceleration time. *2 If a DC voltage (P-N) is supplied to control power supply terminals R0 and T0, the inverter may detect undervoltage and trip when the inverter power is turned off. If this cause a problem in your system, specify "00" or "02" for the trip selection. *3 The inverter may start the motor with 0 Hz if: 1) the output frequency is not more than half the base frequency or 2) the voltage induced on the motor is attenuated quickly. *4 Even when a retry operation (01 to 03)is specified for the selection of restart mode (b001) and "disabling tripping" (00 or 02) is specified for the selection of a trip after instantaneous power failure or undervoltage in the stopped state, the inverter will trip if the instantaneous power failure continues over the allowable under-voltage power failure time. (See example 2.) *5 Even when a retry operation is specified for the trip selection, the inverter will trip if the cause of trip is not removed by the end of the retry wait time before motor restart (b003). If this occurs, prolong the retry wait time. *6 Even when a retry operation is specified for the retry selection, the inverter will trip if the undervoltage status continues for 40 seconds or more. *7 when starting the motor with matching frequency is selected, inverter may restart suddenly by alarm resetting, resetting and retry-start. The figures below show the timing charts for starting with a matching frequency (when "02" is specified for the selection of restart mode [b001]). t0: Duration of instantaneous power failure t1: Allowable under-voltage power failure time (b002) t2: Retry wait time before motor restart (b003) (Example 1) (Example 2) Power supply Power supply Inverter output Inverter output Motor speed Free-running Motor speed Free-running t0 t1 t2 t1 t0 (Example 3) When the motor frequency (speed) is more than the setting of "b007": (Example 4) When the motor frequency (speed) is less than the setting of "b007": Power supply Power supply Inverter output Inverter output Motor frequency (speed) Free-running b007 Motor frequency (speed) Free-running b007 0 t0 t2 Starting with matching frequency 0 t0 t2 Starting with 0 Hz 4 - 34
Chapter 4 Explanation of Functions (2) Output of the alarms for instantaneous power failure and undervoltage in the stopped state Use function "b004" to specify whether to output an alarm when instantaneous power failure or undervoltage occurs. The inverter outputs the alarm providing the control power remains in the inverter. Output of the alarms for instantaneous power failure and undervoltage in the stopped state Examples 5 to 7 show the alarm output operations with standard settings. Examples 8 to 10 show the alarm output operations with the settings to supply DC power (P-N) to control power supply terminals R0 and T0. (Example 5) b004:00 Power supply While the inverter is stopped Power supply While the inverter is operating Operation command Operation command Inverter output Inverter output (Example 6) b004:01 Power supply While the inverter is stopped Power supply While the inverter is operating Operation command Operation command Inverter output Inverter output (Example 7) b004:02 Power supply While the inverter is stopped Power supply While the inverter is operating Operation command Operation command Inverter output Inverter output (Example 8) b004:00 Power supply Operation command Inverter output While the inverter is stopped While the inverter is operating Power supply Operation command Inverter output (Example 9) b004:01 Power supply Operation command Inverter output While the inverter is stopped Undervoltage While the inverter is operating Power supply Operation command Inverter output (Example 10) b004:02 Power supply Operation command Inverter output While the inverter is stopped While the inverter is operating Power supply Operation command Inverter output Note 1: You can assign the instantaneous power failure alarm signal (IP: 08) and the undervoltage alarm signal (UV: 09) to any of the intelligent output terminals [11] to [15] (C021 to C025) and the alarm relay terminal (C026) to output the alarm signals. Note 2: For the alarm output following the occurrence of power failure of 1 second or longer, see the explanation of reset (Section 4.2.48). 4 - 35
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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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Contents Chapter 1 Overview 1.1 Ins
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Chapter 7 Specifications 7.1 Specif
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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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SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

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