BERTHOLD TECHNOLOGIES LB 480, User Manual

Page: 220 / 450

54733-10BA2L
2 – 220
02.2017
3 Electrical Installation Volume 2
Signal cable with shielding
We recommend using a screened cable for the signal lines. The
screen has to be connected to the detector on the PE terminal in the
terminal compartment of the detector, or better, to suitable EMC
cable glands.
11 - 12 Open collector signal output with reverse voltage protection
ALARM: no current flowing
NORMAL: Current flowing
The supply voltage for the open collector must
be between 5 and 36V.
The maximum current that may flow through the open col-
lector is 100mA.
Depending on the supply voltage, this leads to the following
resistance values which must be connected:
5V:
≥ 30 Ω
12V: ≥ 100 Ω
24V: ≥ 220 Ω
36V: ≥ 340 Ω
If the resistance value is not reached, the open collector
may be damaged.
13 - 14 Reserved for optional I/Os
15 - 16 Pt100 for temperature compensation, only for density mea-
surement
17 - 18 Like terminal 19 - 20: additional terminal pair for parallel
connection of a HART
®
Communicator
19 - 20 HART
®
current output: 4-20 mA current output for mea-
sured value output and parameterization. This current out-
put is used for the continuous transfer of the measured
value and for display of the error status via the adjustable
fault current:
– 4–20 mA for current measured value.
– Adjustable fault current from 3.5 to 24 mA in case of
error.
The current output is continuously monitored and in
case of failure signals the fault current set via the soft-
ware through a redundant current path. The digital
HART
®
communication remains in effect even on the
redundant current path.
– Max. cable length with BERTHOLD cable # 32024:
– 1600m at 250 Ω
– 800m at 500 Ω
– Depending on the type, the current output is operated in
the Sink or Source mode.
Source mode (active current output)
– Impedance region: 250 ... 500
Ω
Sink mode (passive current output)
– Supply voltage: 18 ... 32V
DC
– max. impedance: 500 Ω
Terminals Master
HART
®