Flowserve 3400IQ Digital Positioner - Manual (Page 11)

11
Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
flowserve.com
Table V: Hazardous Area Certifications
Intrinsically Safe
(PENDING)
Explosion Proof
Approved
Class I, Div 1, Groups A, B, C, D
Class II, III, Div 1, Groups E, F, G
(See Figure 1 for installation
requirements.)
Class I, Div 1, Groups B, C, D
Class II, III, Div 1, Groups E, F, G
T6 Ta = 60°C
NEMA/TYPE 4X
Intrinsically Safe
(PENDING)
II 1G EEx ia IIC T4, T5
T4 Ta = -40°C to 80°C
T5 Ta = -40°C to 35°C
IP 65
Flameproof
(PENDING)
II 2 GD EEx d IIB + H2
T5, Ta = -40°C to 80°C
IP65
CE Compliant
FISCO Compliant
4.2 Positioner Operation
The Logix 3400IQ positioner is an electric feedback instrument. Figure 1 shows a Logix 3400IQ
positioner installed on a double-acting linear actuator for air-to-open action.
The Logix 3400IQ receives power from the two-wire, FF input signal. This positioner utilizes
FF communications for the command signal. The command source can be accessed with the
Rosemount 375 communicator or other host software.
0% is always defined as the valve closed position and 100% is always defined as the valve open
position. During stroke calibration, the signals corresponding to 0% and 100% are defined.
The input signal in percent passes through a characterization/limits modifier block. The positioner
no longer uses CAMs or other mechanical means to characterize the output of the positioner. This
function is done in software, which allows for in-the-field customer adjustment. The positioner has
four basic modes: Linear, Equal Percent (=%), Quick Open (QO) and Custom characterization. In
Linear mode, the input signal is passed straight through to the control algorithm in a 1:1 transfer. In
Equal Percent (=%) mode, the input signal is mapped to a standard 30:1 rangeability =% curve. In
Quick Open the input signal is mapped to an industry standard quick-open curve. If Custom char-
acterization is enabled, the input signal is mapped to either a default =% output curve or a custom,
user-defined 21-point output curve. The custom user-defined 21-point output curve is defined using
a handheld or the Host configuration tool software. In addition, two user-defined features, Soft
Limits and Final Value Cutoff, may affect the final input signal. The actual command being used to