85
®
Commissioning
Modulation
PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Cannot get past P0.
Unit in safety shutdown.
No fuel selected.
Burner not selected.
High control limit exceeded.
Unit in commission ratio mode.
Burner off via serial comms.
Hold FAULT MUTE key when faults clear.
Check EK6 (profile 1 input), EK7 (profile 2) & EK10 (profile 4).
Check EK5 (burner select input).
Check EK14 and wait for press/temp to drop.
Press NEXT to advance to next setpoint.
Turn burner on using ComFire software.
"Px" or "Ax" display flashes
constantly and motor posi-
tions cannot be altered.
Drives moving to position.
Burner off in adjust ratio mode.
A0, A1, A2 displayed.
Two adjacent lead drive set points similar
(burner on, adjust ratio mode).
Wait for drives to reach position.
Fire burner to alter points in adj. ratio mode.
Use commission ratio mode to alter these.
The lower setpoint should be assessable (AX stops flashing) -
the lead drive position at this point must then be reduced
slightly.
"Px" or "Ax" display does
not flash and motor posi-
tions cannot be altered.
Incorrect motor selected.
No feed on MOTOR COM.
Motor microswitch open.
Use the top quadrant keys to select a motor.
Check for feed on terminal PE1 / PF2.
Adjust motor micro switch.
Motors appear to move too
quickly.
+15V potentiometer supply incorrectly
selected.
Change the link on the basic drive board to select a +5V potenti-
ometer supply.
Motor feedback will only
go up to approx 35°.
+5V potentiometer supply incorrectly
selected.
Change the link on the basic drive board to select a +15V poten-
tiometer supply.
Option parameter not avail-
able.\
Another option parameter must be set
first.
Set option parameter (usually XX.0) to a non-zero value to
enable other params. in group.
Option parameter not
adjustable.
Wrong passcode entered or burner fir-
ing.
Enter the supplier passcode and/or turn the burner off before
changing the value.
Not possible to enter com-
mission ratio mode.
Supplier passcode incorrect.
Burner firing.
Enter correct passcode.
Turn burner off.
Not possible to enter
adjust ratio mode.
Supplier passcode or adjust ratio pass-
code incorrect.
Enter supplier passcode with the burner on OR adjust ratio pass-
code with the burner on or off.
PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Sensor or modulation rate
inaccurate.
V/I input setting incorrect.
5/24V supply setting incorrect.
Check option parameter 03.2 and PSU links.
Check PSU links.
Intermittent positioning
faults.
Lead drive setting incorrect.
Profile not suitable.
Profile too close to micro-switch.
Poor Earth or shielding.
Feedback potentiometer faulty.
Change lead drive (option 07.0 – 07.7).
Increase motor range (by adjusting linkages).
Move end points further away from high/low.
Check wiring.
Move motors over the full range and check that the feedback
displayed changes smoothly and always in the right direction.
Modulation rate sticks at a
profile setpoint.
Lead drive position similar or same as
adjacent setpoint.
Enter commission ratio mode and change the lead drive set-
points or change lead drive.
Unit stuck at low fire.
Meas. value exceeds setpoint.
Low fire hold time not expired.
Warming limit active (EK21=1).
Unit in manual.
External low fire hold.
Sequencing low fire hold.
Unit not released to modulate
No fault.
Wait for low fire hold time to expire.
Wait for boiler to warm up.
Press the AUTO key to change to auto mode
Remove feed from PC8 and PC10.
Increase the mod. rate in manual mode.
See options 15.1 / 15.2 and inputs PC15 / PC16
