Pfm Output (Electronic Insert Fel67) - Endress+Hauser Liquiphant FTL64 Operating Instructions Manual

Liquiphant FTL64
Endress+Hauser
Behavior of switch output and signaling
MAX
MIN
 25 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
Reverse polarity protection
Observe 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 operating mode 150 Hz, MIN operating mode 50 Hz
• Demand mode: MAX operating mode 50 Hz, MIN operating mode 150 Hz
• Alarm: MAX/MIN operating 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