Parker IQAN-XS2 Instruction Book

27Failure ModesAppendix DInstruction book, IQAN-XS2Appendix DFailure ModesThe following tables contain information about the different possible failures that couldoccur for each module subsystem. In most cases when an error is detected, a messagewill be presented on the master display together with an error code on the module. Insome cases, the module will turn off or at least shut down the outputs, to increasesafety.Failure modes for CAN interfaceFailure modes for VREFFailure mode Effect1 CAN-H to -BAT No CAN communication. All output turned off.2 CAN-L to -BAT No CAN communication. All output turned off.3 CAN-H to +BAT No CAN communication. All output turned off.4 CAN-L to +BAT No CAN communication. All output turned off.5 CAN-L open circuit No CAN communication. All output turned off.6 CAN-H open circuit No CAN communication. All output turned off.7 CAN-L to CAN-H No CAN communication. All output turned off.8 CAN-termination failure, termination on No effect9 CAN-termination failure, termination off Dependent on CAN size and number of CAN nodes.Failure mode Effect1 +VREF Open VIN out of range, will create a VIN error => VIN=Predefined error value.aa. Measure is controlled by CAN master and application as a result from the CAN error message. Turningoutputs off is controlled by CAN master unit and therefore delayed maximum 2 bus cycles.2 -VREF Open VIN out of range, will create a VIN error => VIN=Predefined error value.a3 +VREF Short-circuit to -VREF VREF error => VIN out of range, will create a VIN error => VIN=Prede-fined error value.a4 +VREF Short-circuited to +BAT VREF error => VIN out of range, will create a VIN error => VIN=Prede-fined error value.a5 +VREF Short-circuited to -BAT VREF error => VIN out of range, will create a VIN error => VIN=Prede-fined error value.a6 -VREF Short-circuited to +BAT External fuse (if <7.5A) on +BAT blows.7 -VREF Short-circuited to -BAT Not detected.

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