Atmospheric Oil Mist Detection System
MULTIPLEX
AM8/JANUARY 2015
EMAIL [email protected] WEBSITE www.oilmist.com 4 East Barnet Road, London, England, EN4 8RW TEL +44 (0)20 7328 3121
Fault Finding
Part4-5
FAULT
ACTION
REMEDY
Fault alarm
comes on.
QMI Monitor
shuts down
Check fuse on side of the
Monitor above security key
FS4
If fuse is OK check external power
supply to QMI system
Fault alarm (will sound) if power is shut
down
“No CPU” light
on
Check internal connections
The CPU light indicates a fault on
MULTIPLEX Power Supply Board
This board is either carried as a spare or
is ex-stock QMI
LED 1 on PSB
Q0104 not
flashing
Check fuse FS1
Change blown fuse
LED 1 for TR1
does not light
FS1 fuse blown
Replace FS1 with 1.25A anti-surge fuse.
If fuse keeps blowing then check wiring
and Sensor for faults. See Part 4-2
TR1 Faulty
Replace TR1 with spare in Maintenance
kit Q0111 (take care not to short TR1
during soldering)
LED 2 does not
light
FS2 fuse blown
Replace FS2 with 400mA anti-surge fuse
If LED 2 still does not light, check for
fault in PSU. See Part 4-2
On start up
of the system
Monitor the
display is erratic
and does not
settle down
Check if cable is screened
If cable is screened, check that screen is
connected to Pin 5 at both ends of the
cable. Make sure the braid or drain wire
does not come into contact with other
terminals at either end of the cable
If cable is not screened, check to see
if cable runs near any electrical power
source. If it does, cover cable in steel
conduit. There is no need for extra
earthing, however the screen needs to be
connected to Pin 5 at both ends
