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Building Technologies Division
Basic Documentation LME7...
CC1P7105en
Infrastructure & Cities Sector
27 PWM settings
29.11.2011
permissible ignition speed close to the
overvoltage limit
. If this is not observed, there
is a risk of loss of safety functions.
27.4.2 Reading the value of parameter 920 in the prepurge
phase (P30) and ignition load phase (P38, P40 and P44)
Procedure
Set the ignition load speed (
P0
) for the burner to the maximum permissible value,
and the prepurge speed (
503.01
) to the minimum value
Let the AZL2... display service mode. Press
/reset
for >3 seconds. The display first
shows
InFo
, then
SEr
Release
/reset
so that parameter number
701.00
starts blinking
Press or
to select parameter
920
(blinking)
Start the burner
Read the value of parameter
920
in the prepurge phase (P30) and ignition phase
(P38, 40 and 44). Write down the values. They will be required as a basis for
setting safety parameter
675.00
By
pressing
ESC
(press
and
simultaneously) you leave the parameter
setting level and return to the initial mode
Note:
If the onboard operating panel of the LME7... basic unit changes from phase display
(e.g. P30) to
SEC
at 1-second intervals, or if the LME7... goes to lockout (
Loc: 225
),
the difference between the actually required PWM value (parameter
936
) and safety
parameter
675.00
or
675.01
is too small. Decrease value
675.00
(parameter
920 -
1%
) or increase value
675.01
(parameter
920 +1%
). Reduce the value until
SEC
disappears from the display.