Pfm Output (Electronic Insert Fel67) - Endress+Hauser Liquiphant FTL51B Operating Instructions Manual

Liquiphant FTL51B
Endress+Hauser
Behavior of switch output and signaling
MAX
MIN
 26 Behavior of switch output and signaling, electronic insert FEL64 DC
MAX DIP switch for setting MAX safety mode
MIN DIP switch for setting MIN safety mode
RD LED, red, for alarm
YE LED, yellow, switch status
GN LED, green, operational status, device on
6.2.5

PFM output (electronic insert FEL67)

• For connecting to the Nivotester FTL325P and FTL375P switching units from Endress
+Hauser
• PFM signal transmission; pulse frequency modulation, superimposed on the power
supply along the two-wire cabling
• Functional testing without level change:
• A functional test can be performed on the device using the test button on the
electronic insert.
• The functional test can also be prompted by disconnecting the supply voltage or
triggered directly by the Nivotester FTL325P and FTL375P switching unit.
Supply voltage
U = 9.5 to 12.5 V
DC
Pay attention to the following as per IEC/EN61010-1: Provide a suitable circuit
breaker for the device.
Power consumption
P ≤ 150 mW with Nivotester FTL325P or FTL375P
Behavior of output signal
• OK status: MAX mode 150 Hz, MIN mode 50 Hz
• Demand mode: MAX mode 50 Hz, MIN mode 150 Hz
• Alarm: MAX/MIN mode 0 Hz
RD YE GN
3 4 5
3 4 5
3 4 5
3 4 5
3 4 5
Electrical connection
6 7 8
6 7 8
6 7 8
6 7 8
6 7 8
A0033513
25