Instructions for use
SCU 835 / SEC 15
7
Indicators and operation
7.1
Indicators on the front panel
LED
Description
Colour
Explanation
Operation
Green
Lights up during operation.
Flashes cyclically at
2Hz
during switched off/revision of
sensors/alarm zones (2 Hz 0.5 sec.).
Measuring cycle
Blue
Lights up during data acquisition from sensor cable
I
/
II
.
Data transmission
White
Lights up cyclically for interface connection via
RS232
,
RS485
,
USB
and/or
LAN
.
Fire
I
Red
Flashes cyclically at
1Hz
in the case of a pre-signal if a limit
value for sensor cable
I
is exceeded. Goes out automatically
when the limit value is falling below.
Lights up in case of an alarm if a limit value for sensor cable
I
is exceeded (1 Hz 1 sec.).
Fault
I
Orange (amber)
Lights up in case of a fault for sensor cable
I
.
Flashes cyclically at
1Hz
in case of a device fault together
with
II
(1 Hz 1 sec.).
Fire
II
Red
Flashes cyclically at
1Hz
in the case of a pre-signal if a limit
value for sensor cable
II
is exceeded. Goes out automatically
when the limit value is falling below.
Lights up in case of an alarm if a limit value for sensor cable
II
is exceeded (1 Hz 1 sec.).
Fault
II
Orange (amber)
Lights up in case of a fault for sensor cable
II
.
Flashes cyclically at
1Hz
in case of a device fault together
with
I
(1 Hz 1 sec.).
Table 42: Indicators on the front panel
Attention
If a reset pulse
> 20 sec.
is sent via the
FACP
, the device is set inactive. In this case, both fault
LED
s
and the operation
LED
flashing cyclically with
1Hz
(1 Hz 1 sec.). There is
no
measuring cycle on
sensor cable
I
and/or
II
and therefore
no
alarm can be issued in the event of fire. The fault is displayed
on the
FACP
.
Page 72/112
LISTEC GmbH
60T328-02-LI-en / 29.01.2021
Fig. 170: Front foil
SCU 835
