YASKAWA VS MINI J7 User Manual Page 141
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Troubleshooting Chapter 8-2
8-2-10 Motor Rotates after Output of Inverter is Turned Off
Insufficient DC Control If the motor continues operating at low speed, without completely stopping,
and after a deceleration stop has been executed, it means that the DC
braking is not decelerating enough.
In such cases, adjust the DC control as described below.
• Increase the parameter in n52 for DC control current.
• Increase the parameter in n53 for interruption DC control time.
8-2-11 Detects OV when Motor Starts and Motor Stalls
Insufficient DC control at
startup
Generation of OV and stalling can occur if the motor is turning when it is
started.
This can be prevented by slowing the rotation of the motor by DC braking
before starting the motor.
Increase the parameter in n54 for startup DC control time.
8-2-12 Output Frequency Does Not Reach Frequency Reference
The frequency reference
is within the jump
frequency range.
If the jump function is used, the output frequency stays within the jump
frequency range.
Make sure that the jump width settings in n49 through n50 for jump
frequencies 1 and 2 and jump width in n51 are appropriate.
The preset output
frequency exceeds the
upper-limit frequency.
The upper-limit frequency can be obtained from the following formula.
Maximum frequency in n09 × frequency reference upper limit in n30/100
Make sure that the parameters in n09 and n30 are correct.
8-2-13 Inverter Does Not Run
Because EF (Simultaneous Input of Forward and Reverse Commands) is
Detected, or Motor Rotates Momentarily While Control Device Power is OFF
Sequence Error An EF will be detected if a forward command and a reverse command are
input simultaneously for 0.5 seconds or longer. Correct the sequence.
Malfunction Due to
Unwanted Current Path
Inverter inputs may remain ON due to an unwanted current path for the
controller outputs. With the wiring shown in the following table, if the
controller output power supply is less than 24 V DC or if the power is OFF,
the current indicated by the arrow will flow and the Inverter inputs will
operate. If that occurs, insert a diode as shown in the diagram at point A.
Controller (Output unit)
Section A
S1 to S5
SC
Inverter (Control input)
GND
- 1
- 1
- Visual Aids 3
- General Precautions 4
- Wiring Precautions 5
- Transportation Precautions 5
- Installation Precautions 5
- Warning Labels 7
- CIMR—J7AZ20P1 8
- About this Manual 9
- Application Considerations 10
- Disclaimers 11
- Table of Contents 13
- CHAPTER 1 15
- Overview 15
- 1-1 Function 16
- 1-2 Nomenclature 17
- Nomenclature Chapter 1-2 18
- Digital Operator 18
- CHAPTER 2 19
- 2-1 Installation 20
- Installation Chapter 2-1 21
- 2-2 Wiring 24
- Wiring Chapter 2-2 25
- Removing the Front Cover 25
- 2-2-2 Terminal Block 26
- Main Circuit Terminals 27
- Control Circuit Terminals 28
- Selecting Input Method 28
- 2-2-3 Standard Connections 30
- Circuit Breaker Capacities 31
- Wiring Example 1 34
- Ground Wiring 37
- Harmonics 38
- Standard Connection 43
- LVD Conformance 45
- CHAPTER 3 47
- 3-1 Nomenclature 48
- 3-2 Outline of Operation 49
- Status Monitor 51
- Example of Paramter Settings 53
- CHAPTER 4 55
- Test Run 55
- Chapter 4 56
- 4-1 Procedure for Test Run 57
- 4-2 Operation Example 59
- 4-2-3 Initializing Parameters 60
- 4-2-5 No-load Operation 61
- 4-2-6 Actual Load Operation 62
- CHAPTER 5 63
- Basic Operation 63
- 5-1 Initial Settings 64
- 5-2 V/f Control 65
- V/f Control Chapter 5-2 66
- Basic Conecpt 67
- 5-9 Multi-function I/0 77
- Set Values 78
- Forward (reverse) 80
- RUN command 80
- 5-9-2 Multi-function Output 81
- 5-10 Analog Monitor Output 82
- CHAPTER 6 83
- Advanced Operation 83
- 6-3 Stall Prevention Function 87
- 6-7 Other Functions 93
- 6-7-4 Fault Retry (n48) 95
- Frequency Detection 97
- Other Functions Chapter 6-7 100
- 6-7-8 Error History (n78) 101
- CHAPTER 7 103
- Communications 103
- 7-1-1 Overview 104
- 7-1-2 External Dimensions 104
- 7-1-3 Names of Parts 105
- 7-1-4 Mouting Procedure 105
- Connector 106
- 7-2 Inverter Settings 107
- Inverter Settings Chapter 7-2 108
- Slave Address (n70) 108
- Send Wait Time Setting (n73) 109
- RTS Control Selection (n74) 109
- Communications Format 112
- Message Interval 112
- Message Data Configuration 112
- Slave Address 113
- Function Code 113
- Communications Data 113
- Error Check 114
- 7-4 DSR Message and Response 115
- Response 116
- Example of Data Read 116
- Settings and Response 117
- Example of Loop-back Test 121
- 7-5 Enter Command 122
- Converting the Register Data 123
- Bit reversed 124
- 1 is added 124
- 7-7-1 I/O Function 125
- 7-7-2 Monitor Functions 126
- Errors and Remedies 129
- 7-9 Self-diagnostic Test 130
- CHAPTER 8 131
- Fault Displays and Processing 132
- 8-2 Troubleshooting 137
- 8-2-6 Motor Burns 139
- 8-2-9 Mechanical Vibration 140
- 8-2-13 Inverter Does Not Run 141
- Daily Inspection 142
- Periodic Inspection 142
- Periodic Maintenance Parts 143
- Replacement of Cooling Fan 143
- CHAPTER 9 145
- Specifications 145
- 9-1 Inverter Specifications 146
- 9-2-1 List of Accessories 149
- 9-2-2 Adapter Panel 150
- 9-2-4 Fan Unit 151
- 9-2-5 Digital Operator 152
- 9-2-6 Digital Operator Case 153
- 9-2-8 DC Reactor 153
- 3G3IV-PEZZ08122_ 154
- Applicable Model 154
- External Dimensions (mm) 154
- 9-2-10 AC Reactor 155
- 9-3 Option Specifications 156
- External Dimensions 157
- CHAPTER 10 159
- List of Parameters 159
- List of Parameters Chapter 10 160
- CHAPTER 11 173
- Revision History 176
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