Cla-Val 131VC Series - Manual (Page 8)

The Electronic Control System shall provide the interface between a
remote computer system and the control valve. The controlled parame-
ter signal shall be accepted through a 4-20 mA feedback signal. Local
manual set-point control and full manual control of control valve sole-
noids is to be provided on the controller panel for local control.
Upon receiving the set-point command signal from the remote computer
system, the controller will signal the valve to move and maintain the
valve at the desired set-point. A vacuum fluorescent display of current
status and set-point value in scalable engineering units shall be sup-
plied.
The controller shall compare set-point and feedback values and adjust
the valve accordingly to achieve the set-point. When the feedback sig-
nal deviates from the set-point value, the appropriate opening or closing
solenoid on the control valve shall activate. As the feedback signal
approaches the set-point, the solenoid output will pulse on and off to
gradually return the measurement to set-point. One solid-state relay
energizes for measurements condition below the set-point, while the
other energizes for measurement, greater than set-point. These outputs
shall be wired directly to or through intermediate relays to the opening
and closing solenoids on the control valve. Solenoid output indicator
lights shall illuminate when either the open or closed solenoid is activat-
ed.
The total cycle time between each pulse shall be programmable
between 1 and 120 seconds. The duration of each pulse shall be direct-
ly proportional to the deviation from set-point outside of an adjustable
deadband. The time proportioned outputs shall be independently
adjustable for conditions above and below the set-point to properly tune
valve response. The time proportional output band width shall be inde-
pendently programmable between 1 and 999 percent of full scale. When
the feedback signal returns within the deadband zone, the valve will
maintain position. Provision shall be made to open/close/maintain posi-
tion in the event of a loss of the feedback signal.
The operator interface shall consist of two rows of alphanumeric charac-
ters to display numeric values and units. Color coded alarm, status and
mode indicators shall inform the operator of operating conditions.
Security key codes shall protect against undesired changes to the con-
troller. All programming shall be menu driven.
The controller shall be all solid-state construction with the internal chas-
sis capable of being removed for inspection and adjustment. All program
memory, including set-points and tuning parameters, shall be protected
by an internal lithium battery rated for 10 year life.
Remote communications shall be accepted through a 4-20 mA DC ana-
log set-point signal.When remote operation is selected, the controller
shall monitor the remote set-point signal. When local control is selected,
the set-point shall be changed at the controller keypad.
The Electronic Control System shall be the Cla-Val Model 131VC-1 as
manufactured by Cla-Val, Newport Beach, CA.
Purchase Specifications
The electrical power used to energize the solenoid pilot system on the
valve is routed through the 131VC-1 Electronic Control System.
Because of practical limitations on wire size and distance, we recom-
mend locating the controller near the valve itself. Transmitter signals of 4-20 mA can travel great distances without difficul-
ty, therefore, the controller does not need to be near the signal transmit-
ter. For outdoor and high humidity indoor applications, we recommend
installation in water-tight NEMA 4 enclosures.
Installation
Retrofitting CLA-VAL Control Valves
Existing hydraulically operated Cla-Val control valves can easily be con-
verted to operate with the 131VC-1 Electronic Control System. The valve
is modified by simply adding the Series 131 Solenoid Pilot System. The
Series 131 Pilot System can be installed in parallel with the existing
hydraulic pilot control for backup control in case of electrical power fail-
ure. In this case, the hydraulic pilot system must be isolated from the
valve by a third solenoid valve (see Power Failure Options above). When the existing Cla-Val control valve performs a combination of
control functions (such as pressure reducing and pressure sustaining),
the 131VC-1 Electronic Control System will control the primary function
of the valve. The other secondary functions will continue to be controlled
by the hydraulic pilot controls. Consult Factory for details.
PO Box 1325 Newport Beach CA 92659-0325
Phone: 949-722-4800 Fax: 949-548-5441
CLA-VAL
CLA-VAL CANADA CLA-VAL EUROPE
4687 Christie Drive
Beamsville, Ontario
Canada L0R 1B4
Phone: 905-563-4963
Fax: 905-563-4040 Chemin dés Mesanges 1
CH-1032 Romanel/
Lausanne, Switzerland
Phone: 41-21-643-15-55
Fax: 41-21-643-15-50
© COPYRIGHT CLA-VAL 2013 Printed in USA
Specifications subject to change without notice. www.cla-val.com
E-131VC-1 (R-1/2013)
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