Lamtec ETAMATIC Manual

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Lamtec ETAMATIC Manual Manual pdf 121 page image

1209 Appendix9.23 Run to Shut-off LimitsLike every control system, the ETAMATIC has tolerances, which affect the accuracy of the set-tings. You have influence of these tolerances of the ETAMATIC with the parameter settings.When you adjust the combustion system, ensured that there is a safe and stable flame. Toverify this, it is necessary that you test the combination of settings not only by regarding therequired values that you have set, but also the so-called shut-down limits. This are actuatorsettings which the ETAMATIC just takes without switching off.Perform this test for the whole load range and for all operating modes.This test may only be dispensed with if:– the installation is fitted with fail-safe O 2 or CO monitoring which can trigger a burner shut-down if there is incomplete combustionor– the installation is fitted with fail-safe O 2 trim/ CO control, which compensates the combus-tion tolerancesor– You ensure that the requested mode, has as much excess air over the whole range, thatthe tolerances of the ETAMATIC are of no consequenceor– the parameters in the ETAMATIC are set in that way, that the air defficiency toleranceshave 0 digit, i.e. there is only tolerance on the excess air side.WARNING!If you waive to check the shut-down limits because of one of these measures, you shouldcheck the effectiveness of that measure instead, e.g., if there is O 2 / CO monitoring or control,the stability of ignition should be tested at the shut-down value setWARNING!Due to verification in respect of authorities, test houses, quality management systems, liabilityissues, etc., we strongly recommend that you document any running to shut-down limitsAdjust setpoint value of the continuous channel in the air deficiency direction until the actualvalue feedback has changed by the set number of points (monitoring band)Check combustionReset setpoint value to the next continuous channel in air deficiency direction.Check combustionRepeat, until all continuous channels are checked at their limits.press key 12press keys 2 and 3 to run to the load point for checking itwait until the system has run to that pointenter passwordpress key 14 one time (setting)