Instructions for use
SCU 835 / SEC 15
Important note
On the mainboard
MB SCI 835
the relay positions are shown from the point of view of the function alarm/
fault for device in normal operation, i.e.
no
alarm (
NO
) and
no
fault (
NO
) -
Failsafe
.
Display of the alarm and fault function:
Attention
Alarms and faults are
not
reset automatically!
Alarms can only be reset if the corresponding alarm criterion is no longer fulfilled. In other words, the cur-
rent temperature value
must be 20% below
the set differential alarm threshold or
5% below
the max-
imum alarm threshold.
Faults can
only
be reset, if the reason for the fault has been cleared.
6.6
Optocoupler outputs / RS232 interface
For special applications, two potential-free outputs are available at
P303
of the
SCU 835
. Alarm and/or fault informa-
tion can be forwarded to an external equipment. These can be e.g: sirens and/or flash lights to indicate the corres-
ponding information acoustically and/or visually (→ 3.17). Furthermore the
RS232
interface is available at this con-
Page 54/112
LISTEC GmbH
60T328-02-LI-en / 29.01.2021
Fig. 107: Info
MB SCI 835
Fig. 108:
0 Ω
plug-in jumper:
no alarm
- alarm relay switched off
no fault
- fault relay switched on
Fig. 109: Loop resistors
R*
:
no alarm
- alarm relay switched off
no fault
- fault relay switched on
Fig. 110: Circuit board cut-out for
MB SCI 835
terminal block →
RS232
interface
