Functional Test Of The Electronic Switch With A Test Magnet - Endress+Hauser Liquiphant FTL51B Operating Instructions Manual

Liquiphant FTL51B
Endress+Hauser
MIN
RD GN
1.
>1 s
2.
3.
 41 FEL67 MIN switching behaviour and signaling
A After the test button is pressed, the output frequency is switched off for at least 10 seconds, 150 Hz, even if
the button is pressed for < 10 seconds. If the button is pressed for > 10 seconds, the output frequency remains
at 150 Hz until the test button is released. The output frequency then returns to 50 Hz once again.
The PFM frequency cannot be measured on site. It is therefore recommended to proof
test the functionality at the Nivotester FTL325P/FTL375P.
FEL68 switching behaviour and signaling
MAX
MIN
RD GN
1.
>1 s
2.
3.
 42 NAMUR electronics switching behaviour and signaling
A After the test button is pressed, the current is 0.6 to 1 mA for at least 10 seconds even if the button is pressed
for < 10 seconds. If the button is pressed for > 10 seconds, the current remains at 0.6 to 1 mA until the test
button is released. The current then returns to 2.2 to 3.5 mA.
7.1.3

Functional test of the electronic switch with a test magnet

Perform functional test of the electronic switch without opening the device
• Hold the test magnet against the marking on the nameplate on the outside
• Simulation is possible in the case of the FEL62, FEL64, FEL64DC, FEL68 electronic
inserts
The functional test with the test magnet acts in the same way as pressing the test button
on the electronic insert.
YE
50 Hz
L+ 2 1 L-
150 Hz
L+ 2 1 L-
A
L+ 2 1 L-
YE
2.2 ... 3.5 mA
L+ 2 1
0.4 ... 1 mA
L+ 2 1
A
L+ 2 1
Operation options
RD GN YE
150 Hz
L+ 2
150 Hz
L+ 2
150 Hz
L+ 2
RD GN
YE
0.6 ... 1 mA
L+ 2
0.6 ... 1 mA
L+ 2
0.6 ... 1 mA
L+ 2
1 L-
1 L-
1 L-
A0039214
1
1
1
A0033543
35