Parker IQAN-XA2 Instruction Book

33Failure ModesAppendix DInstruction book, IQAN-XA2Appendix DFailure ModesThe following tables contain information about the different possible failures that could occurfor each module subsystem. In most cases when an error is detected, a message will bepresented on the master display together with an error code on the module. In some cases, themodule will turn off or at least shut down the outputs, to increase safety.Failure modes for VREFFailure modes for CAN interfaceFailure 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 errormessage. Turning outputs off is controlled by CAN master unit and therefore delayedmaximum 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 VINerror => VIN=Predefined error value. a4 +VREF Short-circuited to +BAT VREF error => VIN out of range, will create a VINerror => VIN=Predefined error value.a5 +VREF Short-circuited to -BAT VREF error => VIN out of range, will create a VINerror => VIN=Predefined error value.a6 -VREF Short-circuited to +BAT External fuse (if <7.5A) on +BAT blows.7 -VREF Short-circuited to -BAT Not detected.Failure 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, termina-tion onNo effect9 CAN-termination failure, termina-tion offDependent on CAN size and number of CAN nodes.