YASKAWA CIMR-E7 series Technical Manual

Application Overview 2-19Cable Loss BehaviorThis section describes the configurable cable loss feature of the option card. This feature offers a user maximum flexibility in determining thedriveís response to a loss of communication.After some interval without receipt of a message, the drive can be configured to respond in one of the following manners:! Continue at last frequency! Continue at preset frequency! Stop! Fault (EF0)Three configuration properties are used to select the desired behavior:! nciRcvHrtBt ñ Receive Heartbeat! nciCblLossSpeed ñ Cable Loss Speed! nciCblLossFltEna ñ Cable Loss Fault EnableThe following table summarizes the settings for each type of behavior (X = don’t care): Each behavior is described in additional detail below.Table 2.22 - Cable Loss BehaviorBehavior nciRcvHrtBt nciCblLossSpeed nciCblLossFltEnaContinue at last frequency 0 X XContinue at preset frequency Timeout Interval Preset Speed OffStop Running Timeout Interval 0 OffFault (EF0) Timeout Interval X OnNote: Communication must be established and then lost for these features to function as describedFor modes which describe the drive running after a timeout, a run command must have been issued prior to loss of communications. For safetypurposes, it will not automatically start from a stopped condition. If a user requires the drive to start automatically, additional external wiringmust be added (consult factory).Upon expiration of the timeout interval, the FAULT LED lights and remains lit until communication is restored.# Continue Running at Last FrequencyIn this mode, nciRcvHrtBt is set to 0, disabling the cable loss feature. The other 2 settings are ignored. If communication is lost, the drivesimply maintains its last commanded state.# Continue Running at Preset FrequencyIn this mode, nciRcvHrtBt is set to the desired interval and nciCblLossSpeed is set to the desired preset speed. If the time between messagesexceeds the timeout interval, the driveís speed command is set to nciCblLossSpeed and the drive continues running at this new speed.nciCblLossFltEna must be set to ‘Off’.# Stop RunningIn this mode, nciRcvHrtBt is set to the desired interval and nciCblLossSpeed is set to 0. If the time between messages exceeds the timeoutinterval, the driveís speed command is set to 0 and the run command is set to ‘Off’. nciCblLossFltEna must be set to ‘Off’.# FaultIn this mode, nciRcvHrtBt is set to the desired interval and nciCblLossFltEna is set to ëOní. If the time between messages exceeds the timeoutinterval, an ëEF0í fault is declared and the drive stops. nciCblLossSpeed is ignored.