Siemens LME72.000A2 - Checking Prepurging; Checking the Ignition Load

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Building Technologies Division Basic Documentation LME7... CC1P7105en
Infrastructure & Cities Sector 27 PWM settings 29.11.2011
 Press
/
reset
to go to the respective group
 Press
or to select parameter 675.00 (675 blinking)
 Press
/
reset
for >1 second. Subindex 00 blinks
 Press
/
reset
 Press
or to set the previously determined value -1% of parameter 920
(prepurge phase (P30))
 Press
/
reset
to transfer the setting value to the onboard memory
 By pressing
ESC
(press and simultaneously) you return to the
subindex. Display shows 00 blinking
 Press
or to select subindex 01
 Press
/
reset
 Press
or to set the previously determined value -1% of parameter 920
(ignition phase (P38, 40 and 44))
 Press
/
reset
to transfer the setting value to the onboard memory
 By pressing
ESC
4 times (press and simultaneously) you leave the
parameter setting level and return to the initial mode

Note:
Test mode is indicated by the unit’s 7-segment display changing from SEC to the
relevant program phase at 1-second intervals.
Checking prepurging
 To check the prepurge speed, set the required worst-case conditions close to the
undervoltage limit
 Start the burner and check the speed, the volumetric air flow or air pressure by
taking appropriate measures while ensuring compliance with the relevant
standards (e.g. EN 676) in the prepurge phase (P30)
 If the worst-case requirements are not satisfied, change safety parameter 675.00
accordingly
Checking the ignition load
 To check the ignition load speed, set the required worst-case conditions close to
the overvoltage limit
 Start the burner and check the speed, the volumetric air flow or air pressure by
taking appropriate measures while ensuring compliance with the relevant
standards (e.g. EN 676) in the ignition phase (P38, P40 or P44)
 If the worst-case requirements are not satisfied, change safety parameter 675.01
accordingly
On successful completion of the test, reset parameter 559 to control as described
above (setting value = 1).

Note:
To store the settings in the PME... program module, a manual backup is required.
Also see chapter Manual backup.