GD200A series VFD Contents
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7.8 Simple PLC ..................................................................................................................... 107
7.9 Multi-step speed running ................................................................................................. 107
7.10 PID control .................................................................................................................... 108
7.10.1 General steps of PID parameters setting: ............................................................ 109
7.10.2 PID inching.......................................................................................................... 109
7.11 Pulse counter ................................................................................................................ 110
8 Fault tracking .......................................................................................................................... 112
8.1 What this chapter contains .............................................................................................. 112
8.2 Alarm and fault indications............................................................................................... 112
8.3 How to reset .................................................................................................................... 112
8.4 Fault history .................................................................................................................... 112
8.5 Fault instruction and solution ........................................................................................... 112
8.5.1 Other states .......................................................................................................... 116
8.6 Common fault analysis .................................................................................................... 117
8.6.1 The motor does not work ....................................................................................... 117
8.6.2 Motor vibration ...................................................................................................... 117
8.6.3 Overvoltage........................................................................................................... 118
8.6.4 Undervoltage fault ................................................................................................. 118
8.6.5 Abnormal motor heat ............................................................................................. 119
8.6.6 VFD overheating ................................................................................................... 119
8.6.7 Stall during the acceleration of the motor ............................................................... 120
8.6.8 Overcurrent ........................................................................................................... 121
8.7 VFD system interference troubleshooting ........................................................................ 121
8.8 Maintenance and hardware diagnostics ........................................................................... 122
8.8.1 Overcurrent ........................................................................................................... 122
8.8.2 Cooling fan ............................................................................................................ 124
8.8.3 Capacitors ............................................................................................................. 125
8.8.4 Power cable .......................................................................................................... 126
9 Communication protocol ........................................................................................................ 127
9.1 What this chapter contains .............................................................................................. 127
9.2 Brief instruction to MODBUS protocol .............................................................................. 127
9.3 Application of the VFD ..................................................................................................... 128
9.3.1 RS485 ................................................................................................................... 128
9.3.2 RTU mode............................................................................................................. 128
9.4 RTU command code and communication data illustration ................................................ 131
9.4.1 RTU mode............................................................................................................. 131
9.4.2 ASCII mode ........................................................................................................... 135
9.5 The definition of data address ......................................................................................... 138
9.5.1 The rules of parameter address of the function codes ............................................ 138
9.5.2 The address instruction of other function in MODBUS ........................................... 139
9.5.3 Fieldbus ratio values ............................................................................................. 142
9.5.4 Fault message response ....................................................................................... 143