Endress+Hauser Liquiphant FTL51B - Page 24

Electrical connection Liquiphant FTL51B
24 Endress+Hauser
Supply voltage
U = 19 to 253 V
AC
, 50 Hz/60 Hz / 19 to 55 V
DC
Observe the following as per IEC/EN61010-1: Provide a suitable circuit breaker for the
device, and limit the current to 500 mA, e.g. by installing a 0.5 A fuse (slow-blow) in the
phase (not the neutral conductor) of the supply circuit.
Power consumption
S < 25 VA, P < 1.3 W
Connectable load
Loads switched via 2 potential-free changeover contacts (DPDT)
• I
AC
≤ 6 A (Ex de 4 A), U~ ≤ AC 253 V; P~ ≤ 1 500 VA, cos φ = 1, P~ ≤ 750 VA, cos φ > 0.7
• I
DC
≤ 6 A (Ex de 4 A) to DC 30 V, I DC ≤ 0.2 A to 125 V
According to IEC 61010, the following applies: Total voltage from relay outputs and power
supply ≤ 300 V.
Use electronic insert FEL62 DC PNP for small DC load currents, e.g. for connection to a PLC.
Relay contact material: silver/nickel AgNi 90/10
When connecting a device with high inductance, provide a spark suppressor to protect the
relay contact. A fine-wire fuse (depending on the connected load) protects the relay contact in
the event of a short-circuit.
Both relay contacts switch simultaneously.
Behavior of output signal
• OK status: relay energized
• Demand mode: relay de-energized
• Alarm: relay de-energized