Simple Fault Finding - ABB C1900RC Operating Manual

7 SIMPLE FAULT FINDING

Symptom
Does not power up
Chart does not appear to move
Pens in recording position but do not drop
onto paper
Red pen does not move beyond 94%
position on chart
Pen lift switch on front panel does not
work
Pens do not remain lifted when pen lift key
is used
Analog inputs are slow to respond
Time or date incorrect
Totalizers cannot be set to STOP or GO
Totalizer cannot be set to STOP
External relays connected to relays in
instrument fail to de-energize
Pens return to a different position after a
pen-lift or power down
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Possible Cause
a) Internal fuse (if fitted) is blown
b) Internal power switch (if fitted) is OFF
c) Power supply connections are incorrect
a) Very slow chart speed selected
b) Chart stop function enabled
Chart stop function enabled
When real time event pen is fitted the red pen
cannot go beyond 94% to prevent pens
clashing
Pen lift switch is disabled
Auto pen drop feature is enabled
A large filter time has is set
Not set for correct local time
Operator STOP/GO selection is not enabled
in the
OPERATOR LEVEL
Digital signal assigned to the total STOP/GO
function is active
Arc suppression capacitors are provided
across the relay contacts and capacitor
leakage current may be sufficient to prevent
an external relay from de-energizing
Pens are interfering with one another due to
incorrect setting of pens
Action
a) Check wiring, rectify fault and replace fuse
b) Turn power switch ON
c) Check connections
a) Select required chart speed in
Chart Page
b) De-activate source being used to stop
chart – see
Set Up Chart Page
De-activate source used to stop chart – see
Set Up Chart Page
Use chart range which prevents the need to go
beyond 94% of maximum on chart
Enable pen-lift switch in
Set Up Chart Page
Disable auto pen drop in
Set Up Chart Page
this is not required
Set digital filter value to give required response
in
Set Up Inputs
Set correct time and date in
Set Up Clock
– refer to
Page Advanced Software Manual
Enable counter STOP/GO in the
Totals Page
De-activate digital signal assigned to total
STOP/GO function
Remove the arc suppression components –
IC4 and IC5 on mainboard
IC6 and IC7 on standard I/O and analog relay
IC3 to IC10 on 4 relay module
Each pen requires the force of 1 gram to lift it
off the paper. Carefully bend arm (up or down)
close to the plastic moulding to give correct
setting
Set Up
if
Set Up