VEGA VEGATOR 521, 522, 523, 527 - Manual (Page 9)

VEGATOR 9
2
6
12
20
28
24
22
10
16
18
30
32
d b z
+ -
+
+
-
+
-
L1 (+)
N (-)
-
-
+
3 Electrical connection
3.1 Connection instructions
The electrical connection should be carried
out according to the following connection
schematics. If only one channel is used on
the VEGATOR 527 signal conditioning
instruments, connect a resistor of 1 k
Ω
(0.5 W) to the free connection pin of the se-
cond channel. The resistor prevents the
triggering of a fault signal caused by a mis-
sing sensor.
For each relay output, an additional parallel-
operating transistor output is available.
Reset of alarm functions
For deactivation of a signalling device (horn,
diode etc.) in case of alarm (e.g. reaching the
max. permissible level), an additional key can
be connected to VEGATOR 521 or 522. This
key can deactivate a level alarm. In case of
failure (e.g. cable breakage), the alarm
cannot be deactivated.
If the key is connected, the fail-safe relay has
the same function as the level relay. However,
it is possible to reset the fail-safe relay by
pressing the key for reset of alarm functions.
If, for example, the max. level is reached and
an acoustic warning system is activated, this
system can be deactivated by pressing the
key for reset of alarm functions. The second
output (level relay) still signals the process
control that the max. level has been reached.
Electrical connection
Note
If very strong electromagnetic interferences
are expected, screened cable is
recommended. The screening of the cable
should only be grounded on one sensor side
(e.g. capacitive electrode).
The following illustrations show the
currentless condition.
3.2 Connection schematic
VEGATOR 521 (Ex), 522 (Ex)
Power
supply
Level transistor
Fail safe transistor
Sensor 1
Key for reset of
alarm functions
(opener
function)
Fail safe relay
Level relay