Connecting The Device; 2-Wire Ac (Electronic Insert Fel61) - Endress+Hauser Liquiphant FTL51B Operating Instructions Manual

Liquiphant FTL51B
Endress+Hauser
When the device is used in hazardous areas, it must always be included in the potential
equalization of the system, irrespective of the operating voltage.
The plastic housing is available with or without an external protective earth
connection (PE). If the operating voltage of the electronic insert is < 35 V, the plastic
housing has no external protective earth connection.
6.3

Connecting the device

Housing thread
The thread of the electronics and connection compartment is coated with lubricant
varnish.
Avoid additional lubrication.
6.3.1

2-wire AC (electronic insert FEL61)

• Two-wire AC version
• Switches the load directly into the power supply circuit via an electronic switch; always
connect in series with a load
• Functional testing without level change
A functional test can be performed on the device using the test button on the electronic
insert.
Supply voltage
U = 19 to 253 V , 50 Hz/60 Hz
AC
Residual voltage when switched through: typically 12 V
Observe the following as per IEC/EN61010-1: Provide a suitable circuit breaker for
the device, and limit the current to 1 A, e.g. by installing a 1 A fuse (slow-blow) in the
phase (not the neutral conductor) of the supply circuit.
Power consumption
S ≤ 2 VA
Current consumption
Residual current when blocked: I ≤ 3.8 mA
The red LED flashes in the event of an overload or short-circuit. Check for an overload or
short-circuit every 5 s. The test is deactivated after 60 s.
Connectable load
• Load with a minimum holding power/rated power of 2.5 VA at 253 V (10 mA) or
0.5 VA at 24 V (20 mA)
• Load with a maximum holding power/rated power of 89 VA at 253 V (350 mA) or
8.4 VA at 24 V (350 mA)
• With overload and short-circuit protection
Behavior of output signal
• OK status: load on (switched through)
• Demand mode: load off (blocked)
• Alarm: load off (blocked)
Terminals
Terminals for cable cross-section up to 2.5 mm
Electrical connection
2 (14 AWG). Use ferrules for the wires.
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