Level limit switch
Series VN 1000 / 2000 / 5000 / 6000
Technical information / Instruction manual
page
Electronic module
8/16 mA or 4-20 mA
Output setting: 8/16 mA
The figure illustates the output current
depending on the situation with:
•
Safe measurement (clean fork).
•
Weak vibration amplitude: a fork with so
much material build up, that a weak
vibration is indicated.
•
Fork fully covered.
The output current can indicate the weak
vibration with diagnostics setting „D ON“.
Diagnosis off (setting „D OFF“):
The output changes between 8 mA and
16mA.
Diagnosis on (setting „D ON“):
The output will change from 16 mA to
20 mA and from 8 mA to 6 mA, if the
vibration is weak. This enables a evaluation
on an external 4-20 mA power supply. There
is an internal delay of 10 seconds, until the
change from 16mA to 20 mA and from 8 mA
to 6 mA happens, so that the external power
supply does not indicate „weak vibration“,
when the vibration is stopped and is started
during normal (safe) measurement operation.
Example of evaluating the diagnosis of weak vibration amplitude:
Connection of an external Limit Value Monitor with 4-20 mA input and two relay outputs.
(Fitting units can be ordered as accessories, see price list)
Relay 1 indicates the situation: Full/ empty.
Relay 2 works as a diagnostics output to indicate: Safe measurement/ Non safe measurement (weak
vibration).
Relay 1:
Full/ empty
Set switching point to
10 mA.
Relay 2:
Diagnosis
Set switching point to:
18
mA
for setting "falling characteristic"
7 mA
for setting "rising caracteristic"
Characteristic
setting
D
setting
LED
„Signal output“
LED
„Diagnosis“
Electronic module
Relay 2
Relay 1
External Limit Value Monitor
with 4-20 mA input and two
relay outputs.
Signal output and Diagnosis
Vibranivo
®
1
2
3
4
5
6
7
8
9
10
11
12
VN 1000 / 2000 / 5000 / 6000 g
gi180713
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