Aalborg DFC Digital - Manual (Page 21)

8.3 Troubleshooting Guide
18
Remedy
check connection of power supply
disconnect DFC transducer from power
supply; remove the shorting condition
or check polarities;
fuse resets automatically
disconnect power cord from AC
supply; remove and inspect fuses at
AC power input connector of SDPROC;
replace as necessary
REMOVE CAUSE OF SHORT CIRCUIT!
flush clean or disassemble to remove
impediments or replace
flush clean or disassemble to remove
impediments or return to factory for
replacement
return to factory for replacement
re-adjust valve (section 6.2.4)
disconnect DFC transducer from
power supply; remove the shorting
condition or check polarities; fuse
resets automatically
REMOVE CAUSE OF SHORT CIRCUIT!
apply appropriate gas pressure
flush clean or disassemble to remove
impediments or replace
signal and power supply commons are
different
apply appropriate gas pressure
check cables and all connections or
replace
re-adjust set point
re-adjust valve (section 6.2.4)
locate and correct
return to factory for replacement
Likely Reason
power supply off
fuse blown
(DFC)
fuse blown
(SDPROC)
filter screen obstructed at inlet
occluded sensor tube
pc board defect
valve adjustment wrong
fuse blown
(DFC)
inadequate gas pressure
filter screen obstructed at inlet
ground loop
inadequate gas pressure
cable or connector
malfunction
set point is too low
(<2% of full scale)
valve adjustment wrong
gas leak
pc board defective
Indication
lack of
reading
or output
output reads
at (+) or (-)
saturation
only
flow reading
does not
coincide with
the set point
(DFC models
only)
no response
to set point
(DFC models
only)
unstable or no
zero reading