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Design
LFS1 features
Microprocessor-based flame safeguards LFS1 have a plug-in design and consist of the
power supply section, flame signal amplifier, and flame relay with potential-free
contacts.
There is also an operating button with an integrated LED signal lamp, which is located
under a viewing window. The LED is used to provide a multicolor indication of error
status and operational status messages, concerning flame signal strength, for instance.
The flame signal strength can also be measured as a 0...10 V DC signal using a
commercially available voltmeter (at least CAT III) at terminal 7.
Communicating via the BCI interface:
On the underside of the LFS1 in the base area, there is a communication interface (BCI
interface), which is used to change parameters or provide a numerical indication of the
flame signal. When the display and operating unit AZL2 is connected, it is possible to
change parameters such as the flame signal flame-on and flame-out response times. In
addition, the flame signal strength can also be displayed permanently during
continuous burner operation.
Using with the control unit LEC1:
The electrical circuit of the LFS1 is intrinsically safe and, in conjunction with the control
unit LEC1, is tested for proper functioning each time the burner is started up. An
automatic extraneous light test is performed by increasing the sensitivity of the amplifier
during the burner off and purging times of the control unit LEC1. An automatic flame
detector test is performed by increasing the operating voltage of the UV tubes during
the burner off and purging times of the control unit LEC1.
In the case of applications with other control units
– such as programmable logic
controllers
– the extraneous light test can be activated via the control input at terminal
6. This is not required for ionization supervision.
Undervoltage
∂ Flame OFF signal: From operating position if mains voltage drops lower than
approx. 80 V AC (at U
N
= 120 V AC)
∂ Flame ON signal: Restart is initiated if mains voltage exceeds approx. 85 V AC (at
U
N
= 120 V AC)
∂ Flame OFF signal: From operating position if mains voltage drops lower than
approx. 165 V AC (at U
N
= 230 V AC)
∂ Flame ON signal: Restart is initiated if mains voltage exceeds approx. 170 V AC (at
U
N
= 230 V AC)
Overvoltage
No shutdown if the voltage limit exceeds U
N
+10%.
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Building Technologies
CC1N7782en
18.04.2018