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Building Technologies Division Basic Documentation LME7... CC1P7105en
Infrastructure & Cities Sector 27 PWM settings 29.11.2011
27.4.4 Setting safety parameters 675.00/675.01 and checking
the safety settings under worst-case conditions
Procedure
Select test mode (parameter 559) and check the prepurge speed under worst-case
conditions close to the undervoltage limit, or check the ignition load speeds under
worst-case conditions close to the overvoltage limit:
Note:
In test mode (parameter 559, setting value = 2), the normalized PWM signal
(parameter 675.00) for the prepurge phase or the PWM signal (parameter 675.01) for
the ignition phase is output as a fixed value. Start the burner and check the speed, the
volumetric air flow or air pressure under these worst-case conditions by taking
appropriate measures while ensuring compliance with the relevant standards (e.g. EN
676).
Follow these steps
Select programming mode for the OEM
Press
A
and
F
simultaneously for <5 seconds. Display shows CodE
Enter the OEM’s password via
, and
reset
. Also see chapter Entering the
password
Display changes from PArA to 400: SEt
Press
to select the next parameter group (P500...P600). Display shows
500: PArA
Press
reset
to go to the respective group
Press
or to select parameter 559
Press
reset
Press
or to set the value (2 test modes)
Press
reset
to transfer the setting value to the onboard memory
By pressing
ESC
twice (press and simultaneously) you leave the
parameter setting level and return to the parameter group
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
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