Setting Safety Parameters 675.00/675.01 And Checking The Safety Settings Under Worst-Case Conditions; Procedure; Follow These Steps; Checking Prepurging - Siemens LME7 Series Basic Documentation

Procedure



Follow these steps

Checking prepurging

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27.4.4 Setting safety parameters 675.00/675.01 and checking
the safety settings under worst-case conditions
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).

Select programming mode for the OEM

Press and
A F

Enter the OEM's password via
password

Display changes from PArA to 400: SEt

Press to select the next parameter group (P500...P600). Display shows
500: PArA

Press to go to the respective group
/reset

Press or to select parameter 559

Press
/reset

Press or to set the value (2 test modes)

Press to transfer the setting value to the onboard memory
/reset
ESC

By pressing
parameter setting level and return to the parameter group

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
Basic Documentation LME7...
27 PWM settings
simultaneously for <5 seconds. Display shows CodE
, and
twice (press and
. Also see chapter Entering the
/reset
simultaneously) you leave the
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CC1P7105en
29.11.2011