User Manual

43
MN024-08
TFAx
CaseA
Fig. 3.16(b): Flow-chart describing the external alarm troubleshooting on Case A TFAx.
start
Is any dry contact
connected to some
external equipment?
No
Yes
Disconnect the
dry contact port
Is red LED
upon TFAx
still ON?
No
External equipment
connected to this dry
contact port should be
faulty. Test it.
Yes
Measure voltage between
the terminals of this dry
contact port
Is this dry contact
electrically closed?
The dry contact port
is faulty. Contact
the manufacturer
for assistance.
Yes
Analysis about this dry
contact and its external
equipment has not revealed
any failures.
Connect the dry contact to its
external equipment again.
Is the other dry
contact connected
to external
equipment?
No
Yes
No
end