Instruction Manual

Installation
September 2013
2-33
NOTES:
1/4-18 NPT X 3/8 OD TUBING
ELECTRICAL WIRING
AN AIR SUPPLY LINE IS NEEDED FOR AN
EXTERNAL PILOTED SOLENOID VALVE. CONTACT
YOUR EMERSON PROCESS MANAGEMENT SALES
OFFICE FOR ADDITIONAL INFORMATION
LOGIC SOLVER
LC340 LINE
CONDITIONER
DVC6000 SIS DIGITAL
VALVE CONTROLLER
SINGLE-ACTING SPRING AND DIAPHRAGM ACTUATOR
OR PISTON ACTUATOR WITH SPRING RETURN
ASCO (LOW-POWER CONSUMPTION)
SOLENOID VALVE
DE-ENERGIZED
EXTERNAL PILOT LOADING
GASKET COVER -
INTERNAL - COVERED
EXTERNAL - EXPOSED
(NORMALLY VALVE IS
FULLY OPEN WITH
WITH VOLTAGE TO
DIGITAL VALVE CONTROLLER)
PISTON ACTUATOR
VALVE DISC
FAILS CLOCKWISE
ON LOSS OF AIR
VENT
VENT
24VDC
PRINTED WIRING BOARD
DIP SWITCH SET FOR
MULTI-DROP (UP POSITION)
19B6915-A
19B6917-A
E0770-1
1
1
A
B
SUPPLY
Figure 2-29. Example of FIELDVUE DVC6000 SIS Digital Valve Controller Installed in a 2-Wire SIS System
Table 2-2. Maximum Loop Wire Resistance per Logic Solver
Output Voltage
(1)
Logic Solver
Output
Voltage
(VDC)
Maximum
Loop Wire
Resistance
(Ohms)
Maximum Wire Length (feet)
(2)
22 AWG 20 AWG 18 AWG 16 AWG
24.00
23.75
23.50
23.25
23.00
32.0
27.0
22.0
17.0
12.0
952
804
655
506
357
1429
1205
982
759
536
2381
2009
1637
1265
893
3175
2679
2183
1687
1190
22.75
22.50
7.0
2.0
208
60
313
89
521
149
694
198
1. Maximums in this table assume a line conditioner and a solenoid that requires a
minimum of 20.4 V and 42 mA to engage.
2. Wire length includes both wires in a twisted pair.
The line conditioner introduces an approximate 2.0
volt drop in the SIS system wiring with a 50 mA load. If
used with a solenoid valve (such as the ASCO
EF8316G303, EF8316G304, EFX8553G305 103594,
or EFX8551G305 103594) the guaranteed
engagement voltage at maximum temperature must
be ensured.
ASCO EF8316 or EF8553 solenoid valves (if
connected) require up to 42 mA to pull in. The digital
valve controller set for multi-drop operation draws
approximately 8 mA. Based on these conditions, table
2-2 lists the maximum loop wire resistance permitted
for various logic solver output voltages. The table also
lists maximum length of wire of various gauges that
may be used.
The line conditioner is intended for installation in a
control or marshalling cabinet near the logic solver
field wiring terminals. In some installations, such as
shown in figure 2-30, where no solenoid is used, an
impedance boosting multiplexer may be used in place
of a line conditioner. The LC340 line conditioner will be
needed when a low-power solenoid is connected to
the same 2-wire loop as the digital valve controller as
shown in figure 2-29.
2