Kromschroder FCU 500 - Maximum Temperature Monitoring with STL

FCU 500, FCU 505 · Edition 02.17 26
Temperature monitoring
4.2 Maximum temperature monitoring with
(flue gas) safety temperature limiter (STL/FSTL
function)
As soon as the maximum permitted temperature limit
is reached in the furnace or in the flue gas or an error
occurs on the monitoring equipment within the permit-
ted temperature range (e.g. sensor discontinuity, sensor
short-circuit), the FCU will perform a fault lock-out. The
safety interlock output will no longer be set.
The temperature module integrated in the FCU..H1 or
an external safety temperature limiter (STL) can be
used for this function.
4.2.1 With integrated STL/FSTL
FCU 50x..H1
M
BCU 4xx..D
9
BCU 4xx..D
9
BCU 4xx..D
9
57
5
5
5-8
STL
4.2.2 With external STL/FSTL
M
BCU 4xx..D
9
BCU 4xx..D
9
BCU 4xx..D
9
57
5
5
FCU 50x..H0
FCU 50x..H1
46
STL