33
Failure Modes
Appendix D
Instruction book, IQAN-XA2
Appendix D
Failure Modes
The following tables contain information about the different possible failures that could occur
for each module subsystem. In most cases when an error is detected, a message will be
presented on the master display together with an error code on the module. In some cases, the
module will turn off or at least shut down the outputs, to increase safety.
Failure modes for VREF
Failure modes for CAN interface
Failure mode Effect
1 +VREF Open VIN out of range, will create a VIN error =>
VIN=Predefined error value.
a
a. Measure is controlled by CAN master and application as a result from the CAN error
message. Turning outputs 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.
a
3 +VREF Short-circuit to -VREF VREF error => VIN out of range, will create a VIN
error => VIN=Predefined error value.
a
4 +VREF Short-circuited to +BAT VREF error => VIN out of range, will create a VIN
error => VIN=Predefined error value.
a
5 +VREF Short-circuited to -BAT VREF error => VIN out of range, will create a VIN
error => VIN=Predefined error value.
a
6 -VREF Short-circuited to +BAT External fuse (if <7.5A) on +BAT blows.
7 -VREF Short-circuited to -BAT Not detected.
Failure mode Effect
1 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 on
No effect
9 CAN-termination failure, termina-
tion off
Dependent on CAN size and number of CAN nodes.
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