Cla-Val X117C - Manual

CALIBRATION
1. When properly adjusted, the transmitter arm TOTAL arc of travel,
as valve moves from full closed to full open will be approximately
60 to 70 degrees. Thus, the transmitter-actuating arm will be horizontal
when the valve is halfway open (approximately 30 degrees up and
30 degrees down). At valve closed position the transmitter will
have a 4 mA output and at fully open position the transmitter will
have a 20 mA output.
2. You will need the following tools to calibrate and align the X117C:
A.) A small flat blade screwdriver to fit the span and null
potentiometers.
B.) A ruler for measuring location of transmitter arm and valve
actuating stem and spool.
Valve Position Transmitter
X117C
DESCRIPTION
The Model X117C Valve Position Transmitter is designed to provide
analog signal (4 - 20 mA, 2 wire) output of valve position for Cla-Val
Main Valves. A stem extension is fitted to the main valve stem with
the position transmitter mechanically linked to it. The valve stem
is mechanically linked to the electronics for an output signal that is
in direct proportion to valve position. Optional limit switches (2
SPDT or 2 DPDT) are provided on the Model X117CLS for signaling
when valve has reached fully open or closed position. Provisions
are made for bleeding air from valve cover through a small bleed
screw and washer located on one wrench flat of adapter.
INSTALLATION
Normally, the X117C is supplied mounted on the Cla-Val main
valve. If X117C has not been installed at factory, then install stem,
adapter, mounting bracket and transmitter (in order) as shown on
drawing 16767. Necessary field setting of the X117C requires
some adjustment to the position of the transmitter relative to the
stem and the spool, so you may need to loosen transmitter on the
bracket. Refer to Drawing No. 16767.
MODEL
INSTALLATION / OPERATION / MAINTENANCE
OPERATION
The signal from the position sensing linkage mechanism is converted
to a two-wire 4 to 20 mA current output appearing at the output
terminals. The voltage compliance range is 12.5 to 40 Volts DC.
Initial resistance will range from 975 ohms at transmitter full over-
travel (Valve open) to 500 ohms at transmitter free position (Valve
closed)
Wiring
Orient transmitter and bracket to conduit. Loosen jam nut holding
transmitter and bracket to adapter for connecting transmitter to
field wiring conduit. Tighten jam nut after connection is made. After
unthreading housing from transmitter connect wires to OUTPUT
screw terminals. DO NOT USE HOUSING AS WIRING PULLBOX.
Use good field wiring practices for low voltage DC analog instru-
mentation wiring (suggest 18-gage multistrand wire minimum).
Avoid potential ground loops. See drawing for typical wiring con-
nections. Calibration of transmitter should be done with a temporary
hookup of test equipment before final wiring connections are
made. The enclosure is NEMA rated 1, 3, 4, 4X, 6, 6P, 7, 9, and 13.
Appropriate measures should be taken to avoid internal condensation.
C.) A 4-20 mA calibration/tester or multiamp-tester/meter or
some means of measuring the 4-20 mA transmitter output,
D.) A small (9/64 inch) hexagon key wrench to fit the transmitter
adjustable roller arm,
E.) A small (3/32 inch) hexagon key wrench to fit the spool
setscrew,
F.) Hand tools to tighten X117C assembly after calibration is
complete.
IMPORTANT CAUTION: The transmitter does not have overtravel
stops. Use care to insure that rotary travel does not exceed 80
degrees from "center" (free) position in either direction during start
up and operation. Damage to the transmitter could occur.
3. Make preliminary mechanical settings. (Refer to Drawing No.
16767) Be sure that the valve is in the fully closed position. See
Technical Manual for main valve for information on this. Be sure
that line isolation or block valves are closed. Be sure that the
Function Switch in the transmitter is in the “CW” position.
4. Adjust bracket and transmitter to preliminary centerline distance
“C” for valve size. See Table. This is distance between valve actuating
stem centerline (actuates vertically up and down) and transmitter
actuating arm pivot centerline (rotates vertically up and down).
Install spool on actuating stem.
5. Position the actuating arm. With valve in closed position, loosen
setscrews on spool and actuating arm. First, completely loosen
actuating arm adjusting screw to allow the knurled shaft of the
transmitter to return to "center" (free) position. Then, adjust actuating
arm in or out on the knurled shaft so that the actuating arm roller
is making good contact with the lower lip of the spool and does not
contact the center of the spool. The actuating arm should be about
30 degrees down from pivot horizontal centerline.