Failsafe system which uses the inverter
Precautions for use of the inverter
3 - 26
Backup method outside the inverter
Even if the interlock is provided by the inverter status signal, enough failsafe is not ensured depend-
ing on the failure status of the inverter itself. For example, if an inverter CPU fails in a system inter-
locked with the inverter's fault, start, and RUN signals, no fault signal will be output and the RUN signal
will be kept ON because the inverter CPU is down.
Provide a speed detector to detect the motor speed and current detector to detect the motor current
and consider the backup system such as performing a check as below according to the level of im-
portance of the system.
●
Start signal and actual operation check
Check the motor running and motor current while the start signal is input to the inverter by
comparing the start signal to the inverter and detected speed of the speed detector or detected
current of the current detector.
Note that the current is flowing through the motor while the motor coasts to stop, even after the
inverter's start signal is turned OFF. For the logic check, configure a sequence considering the
inverter's deceleration time. In addition, it is recommended to check the three-phase current
when using the current detector.
●
Command speed and actual operation check
Check for a gap between the actual speed and commanded speed by comparing the inverter's
speed command and the speed detected by the speed detector.
I001879E
Fig. 3-15:
Backup method outside the inverter
System failure
Inverter
Controller
Sensor
(speed, temperature,
air volume, etc.)
To the alarm detection sensor
Summary of Contents for FR-A820-00046 (0.4K)
Page 2: ......
Page 4: ......
Page 144: ...System configuration for Ethernet communication FR A800 E Installation and wiring 2 114 ...
Page 202: ...Basic operation procedure JOG operation Basic operation 4 32 ...
Page 1090: ...Check first when you have a trouble Protective functions 6 50 ...
Page 1189: ...Appendix EC Declarations of Conformity FR A800 A 49 ...
Page 1190: ...EC Declarations of Conformity Appendix A 50 ...
Page 1191: ...Appendix EC Declarations of Conformity FR A800 A 51 ...
Page 1192: ...EC Declarations of Conformity Appendix A 52 ...
Page 1193: ...Appendix EC Declarations of Conformity FR A800 A 53 ...
Page 1194: ...EC Declarations of Conformity Appendix A 54 ...
Page 1195: ...Appendix EC Declarations of Conformity FR A800 A 55 ...
Page 1196: ...EC Declarations of Conformity Appendix A 56 ...
Page 1197: ...Appendix EC Declarations of Conformity FR A800 A 57 ...
Page 1198: ...EC Declarations of Conformity Appendix A 58 ...
Page 1199: ...Appendix EC Declarations of Conformity FR A800 A 59 ...
Page 1200: ...EC Declarations of Conformity Appendix A 60 ...
Page 1201: ...Appendix EC Declarations of Conformity FR A800 A 61 ...
Page 1202: ...EC Declarations of Conformity Appendix A 62 ...
Page 1203: ...Appendix EC Declarations of Conformity FR A800 A 63 ...
Page 1204: ...EC Declarations of Conformity Appendix A 64 ...
Page 1205: ...Appendix EC Declarations of Conformity FR A800 A 65 ...
Page 1206: ...EC Declarations of Conformity Appendix A 66 ...
Page 1207: ...Appendix EC Declarations of Conformity FR A800 A 67 ...
Page 1208: ...EC Declarations of Conformity Appendix A 68 ...
Page 1209: ...Appendix EC Declarations of Conformity FR A800 A 69 ...
Page 1210: ...EC Declarations of Conformity Appendix A 70 ...
Page 1211: ...Appendix EC Declarations of Conformity FR A800 A 71 ...
Page 1212: ...EC Declarations of Conformity Appendix A 72 A 7 2 FR A846 series ...
Page 1213: ...Appendix EC Declarations of Conformity FR A800 A 73 ...
Page 1214: ...EC Declarations of Conformity Appendix A 74 ...
Page 1215: ...Appendix EC Declarations of Conformity FR A800 A 75 ...
Page 1217: ......