Troubleshooting
continued
RFT9739 Rack-Mount Transmitter Instruction Manual
71
Be
fo
re
Y
o
u
B
e
g
in
Getti
ng Sta
rted
M
oun
ting
P
o
w
e
r-
Suppl
y and
Sen
s
or Wi
ri
ng
O
u
tp
ut Wi
ri
ng
Star
tu
p
T
ro
u
b
le
s
hoo
ting
Figure 7-1. HART
®
Communicator, ProLink
®
PC-Interface, and AMS modem connections
1. If necessary, add resistance in the loop by installing resistor R1. SMART FAMILY
®
devices require a minimum loop
resistance of 250 ohms. Loop resistance must not exceed 1000 ohms, regardless of the communication setup.
2. The DCS or PLC must be configured for an active milliamp signal.
3. Resistor R3 is required if the DCS or PLC does not have an internal resistor.
CAUTION
Connecting a HART device to the RFT9739 primary variable milliamp output loop could cause transmitter
output error.
If the primary variable (PV) analog output is being used for flow control, connecting a HART device to the output
loop could cause the transmitter 4-20 mA output to change, which would affect flow control devices.
Set control devices for manual operation before connecting a HART device to the RFT9739 primary variable
milliamp output loop.
Rack-mount
RFT9739
HART socket
(same circuit as
PV terminals)
R2
R3
(Note 3)
R1
(Note 1)
DCS or PLC
with internal
resistor
(Note 2)
HART
Communicator,
ProLink PCI,
or AMS modem
PV+
PV–
HART socket or
PV terminals
Summary of Contents for Fisher Rosemount RFT9739
Page 1: ...Model RFT9739 Rack Mount Transmitter Instruction Manual Version 3 Transmitters February 2000 ...
Page 2: ......
Page 4: ......
Page 20: ...10 RFT9739 Rack Mount Transmitter Instruction Manual ...
Page 26: ...16 RFT9739 Rack Mount Transmitter Instruction Manual ...
Page 92: ...82 RFT9739 Rack Mount Transmitter Instruction Manual ...
Page 100: ...90 RFT9739 Rack Mount Transmitter Instruction Manual ...
Page 110: ...100 RFT9739 Rack Mount Transmitter Instruction Manual ...
Page 112: ...102 RFT9739 Rack Mount Transmitter Instruction Manual ...
Page 120: ...110 RFT9739 Rack Mount Transmitter Instruction Manual ...
Page 122: ...112 RFT9739 Rack Mount Transmitter Instruction Manual ...
Page 129: ......