E658131533Speed command can be transmitted but the run / stop signal is not issued. Slave station should have an indi-vidual stop signal or the function to stop the action by the frequency reference. (Setting is necessary for :Operation start frequency, : Operation start frequency hysteresis .)For continuing the operation by the last received command value in the case of a communication breakdown,communications time-out time () to trip the slave inverters. The master inverter does not trip even thoughthe communication breakdown happens. To trip the master inverter, provide an interlock mechanism by installingan FL fault relay point or the like from the slave side.6. Inter-drive communicationInter-drive communication (communication between inverters) are used, for example, when per-forming speed proportional control or load sharing torque control of two or more inverters withoutusing a PLC or computer. The command is instructed by the operation from the master inverter’spanel or analog input, etc.With the Inter-drive communication function, the master inverter continues to transmit the data se-lected by the parameters to all the slave inverters on the same network. The master inverter usesthe S command for outputting instructions to the slave inverters, and the slave inverters do not re-turn the data. (See chapter 4.2 "Command".) Network construction for a simple synchronized op-eration and speed-proportional operation can be created by this function.* If the master inverter trips, the slave inverters display the blinking error code “t” and come to a fullstop (0Hz).Restoring the master inverter that has tripped returns the slave inverters to working order.* With the communication time-out parameters f803 and f804, you can specify what theslave inverters should do (continue to operate, issue an alarm or trip) if a cable is broken or themaster inverter is turned off during operation.* To use the inter-drive communication function, select “TOSHIBA Inverter Protocol” (,=) in the communication protocol selection parameters. “TOSHIBA Inverter Protocol”(, =) is set for communication protocol selection in Shipment setting. (See “3.Communication protocol.”)Master (60Hz) Slave 1 (50Hz) Slave 2 (40Hz) Slave 3 (30Hz)VF-AS1 VF-AS1 VF-AS1 VF-AS1Analog input
