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Building Technologies Division Basic Documentation LME7... CC1P7105en
Infrastructure & Cities Sector 27 PWM settings 29.11.2011
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.
27.4.5 Matching the working points “Speeds for low-fire (P1),
ignition load (P0) and high-fire (P2) for the heating
engineer to the application
Prerequisites
Initial settings of the basic PWM parameters on the OEM level are made
Unit is wired up in accordance with the proposed application
Mains voltage is available
Safety loop is closed
There is no heat request, unit is in standby (OFF)
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