Baker Hughes Panametrics Sentinel LCT8, User Manual

Page: 24 / 138

2.5.8 Wiring the frequency/totalizer output
Figure 26 below shows sample wiring diagrams of the
frequency/totalizer output circuit for open drain and push-
pull configurations. The use of 12-24 AWG (3.3 - 0.2 mm
2
)
is recommended for single conductor wiring, and 16-24
AWG (1.5 - 0.2 mm
2
) is recommended for two conductors
per terminal.
OUT
RTN
IN
Common
Load
Volts -
(Common)
Volts +
(Int. Pwr. Sup.)
OUT
RTN
+5V
270
Frequency/totalizer output
(push-pull)
Counter
Counter Sentinel LCT8
Sentinel LCT8
Frequency/totalizer output
(open drain)
Figure 26: Totalizer and frequency output wiring Table 2: Wiring the TB2
I/O terminal block
Table 2: Wiring the TB2 I/O terminal block
I/O Pin # Function
F/T1+ Freq 1/totalizer 1 OUT
F/T1– Freq 1/totalizer 1 RTN
F/T2+ Freq 2/totalizer 2 OUT
F/T2– Freq 2/totalizer 2 RTN
NET R (+) MODBUS–RTU RS232 (R)/RS485 (+)
NET T (–) MODBUS–RTU RS232 (T)/RS485 (–)
NET COM MODBUS–RTU common
2.5.9 Wiring the 4-20 mA analog output
The standard configuration of the flow transmitter includes
an isolated 4-20 mA analog output. Connections to this
output may be made with standard 12-24 AWG (3.3 - 0.2
mm
2
) twisted-pair wire for a single conductor, and 16-24
AWG (1.5 - 0.2 mm
2
) wire for a two-conductor connection,
but the current loop impedance for these circuits must not
exceed 1000 ohms. To wire the analog outputs, complete the
following steps:
1. Disconnect the main power to the flow meter and remove
the enclosure side cover.
2. Install the required cable clamp in the chosen conduit
hole on the side of the electronics enclosure.
3. Locate the 26-pin terminal block ( TB2 ) shown in Figure
30 on page 28, and wire the I/O terminal as indicated on
the label inside the wiring access cover (see Figure 13
on page 31 and Figure 29 on page 16 ). For a wiring
diagram see Figure 27 on page 14 or Figure 28 below .
Flowmeter
terminal
board
connector
24 Volt DC
power
supply
+
–
Aout +
Aout –
4/20
Monitor
Load
Figure 27: Analog output passive wiring
Flowmeter
terminal
board
connector
Aout +
Aout –
4/20
Monitor
Load
Figure 28: Analog output active wiring
4. Secure the cable clamp.
Attention European customers!
To meet CE Mark requirements, all cables
must be installed as described in Appendix
A . CE Mark compliance and high noise
environments on page 111 .
5. If wiring of the unit has been completed, reinstall the
wiring access cover on the enclosure and tighten
the set screw.
14 14