26
Standar
d oper
ation
Includes the oper
ating modes
-
oper
ational
, monitoring mode and discharge mode
. T
he device is oper
ational
.
Power
The device changes from oper
ational to the monitoring mode
-
when applying an external supply voltage
9 -32
V
d.c.
or - d
ue to an a.c.
interference in case of a terminal voltage > 1.5
V d.c.
Thr
eshold voltage
The discharge mode is activ
ated if the actual response threshold voltage
(
U
th
)
is exceeded.
This mode remains active until the minimum discharge current is undercut.
Oper
ating err
or
Present if:
-
The response threshold w
as changed without pressing the Release button.
The last released response threshold remains active
.
or -
An inv
alid response threshold is released.
3
V (if the v
alue is undercut) or 50
V (if the v
alue is exceeded) are automatically set.
In both cases
, the following indication
appears on the device:
>>> unchanged according to the oper
ating mode
in monitoring mode
in discharge mode
PS
PU
check
4-20 mA
VCSD
Terms and definitions:
D
OUT
U
th
Digital IN closed
If the digital input is closed,
the device is put into the switch-off mode (also if it is oper
ational) until the contact is opened again.
The device directly changes back to the currently required oper
ating mode
.
Failur
e mode
Monitoring the par
ameters allows to detect a critical fault and to automatically switch the device to a safe state
. T
he failure mode is displayed on the device
(LED
X X X
) and gener
ally via the 4-20 mA current interface (22.8 mA).In case of uncritical faults
, the device is automatically restarted up to three times after
one hour or 2 minutes
.Only if the same fault occurs more than three times in a row
, a critical fault is gener
ated and the device remains in fault in switch-off
mode
.
On-site oper
ator intervention,
namely pressing the
“Reset failure mode”
button,
is required (see also 4.3.2,
page 16)!
