25
4-20 mA
PU
Semi-conductor switch of the power unit (PU)
- on
...switched on
- off
...switched off
Analogue curr
ent interface 4 - 20 mA
- off
…interface off due to missing power supply
- < 4 mA
…wire breakage or missing external power supply
- 4.0 mA
...
on,
but no discharge mode
- 4 - 20 mA
…discharge mode
, discharge current of 0 - 40
A corresponds to 4 - 20 mA
- 22.8 mA
…fault in switch-off mode
, failure mode present
On-site intervention is required in case of critical faults! (see 12.)
Internal power supply unit for supply fr
om the a.c
. pipeline potential
- off
...
switched off
- Standby
...
oper
ational
, w
aiting for input voltage
U
AC
- on
...
in oper
ation due to
U
AC
> 1.5
V
(Digital OUT)
floating contact for centr
alised fault indication
Signal
(contact closed)
only in case of failur
e mode
- …closed -
. .
.open
Actual r
esponse thr
eshold
(
U
th
)
-off
…response threshold is not monitored
-check
…response threshold is monitored
-50
…stopped,
a threshold of 50
V is monitored if the device is oper
ated via
the external power supply
-on
. .
.response threshold w
as exceeded
Meaning
of the icons
PS
check
Monitoring of the following par
ameter
s
- off ...
no monitoring
External power supply 9 - 32
V
- on ...
connected to the
VCSD
.
Important note:
The system is capable of automatically resetting uncritical faults!
Critical fault
Ye
s
No
Monitoring par
ameter
s
ok,
if
..
Battery
Battery voltage
U
batt
> 6.0
V
d.c.
U
cap
d.c..
potential of the pipeline
U
cap
<
±
7.0 V
d.c.
I
cont
Permissible continuous current
I
cont
< 40
A
rms
T
max
Permissible temper
ature
T
max
< 85°C
V
gate
Activ
ation of the power unit
(PU)
active
VCSD
VCSD at
Pipeline
the input
- off
High impedance
Not influenced
- on
Low impedance
I
nfluenced
mA
4
8
12
16
20
A
0
10
20
30
40
D
OUT
U
th
U
ext
