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Failure Modes
Appendix B
Failure modes in Current Mode
The table below presents failure modes and effects on I/O.
Failure mode
Effect
1
COUT Open
COUT error, output turned off
2
RET (active) Open
COUT error, output turned off
3
RET (passive) Open
Not detected, will not influence function
4
COUT Short-circuit to RET (active)
COUT error, output turned off
5
COUT Short-circuit to RET
(passive)
Not detected, will not influence function
6
COUT Short-circuit to +BAT
COUT error, output turned off
7
COUT Short-circuit to - BAT
COUT error, output turned off
8
RET (active) Short-circuit to +BAT
COUT error, output turned off
9
RET (active) Short-circuit to
- BAT
COUT error, output turned off
10
RET (passive) Short-circuit to +BAT
Not detected, will not influence function
11
RET (passive) Short-circuit to
- BAT
COUT error, output turned off
12
COUT Short-circuit to 2:nd COUT
(passive)
Not detected, will not influence function
13
COUT Short-circuit to 2:nd RET
(active)
COUT error, output turned off
14
COUT Short-circuit to 2:nd RET
(passive)
Not detected, will not influence function
15
RET Short-circuit to 2:nd RET
(active)
COUT error, output turned off
16
RET Short-circuit to 2:nd RET (passive)
Not detected, will not influence function.
17
RET (active) Short-circuit to same
channel RET (passive)
Not detected, will influence function. Valve will be powered on both solenoids, effects are valve dependent.
18
Insufficient Voltage
Detected, COUT saturated. If measured current is less
than half of command, COUT error, output turned off
Instruction book, IQAN-MDL2
39