EMERSON DVC7K-H Digital Valve Controller Instruction Manual

Installation:
- Ensure the device is installed with a minimum antenna separation distance of 20 cm / 7.9 in from all persons.
- Do not make changes or modifications to the equipment that are not expressly approved by Emerson.

Operation:
- Ensure the device does not cause harmful interference.
- The device must accept any interference, including that which may cause undesired operation.
Maintenance:
- Responsibility for proper maintenance remains solely with the purchaser and end user.
Contact Information:
- For related documents and support, visit Fisher.com or connect on social media platforms like Facebook, LinkedIn, and X.com.
Trademark Information:
- Fisher and FIELDVUE are marks owned by Emerson Electric Co. All other marks are property of their respective owners.
Locations:
- Emerson has offices in Marshalltown, Iowa, USA; Sorocaba, Brazil; Cernay, France; Dubai, UAE; and Singapore.
- For more information, visit www.Fisher.com

FAQs

Q: What should I do if the device causes interference?
- A: Ensure the device is operated according to the specified guidelines and if interference persists, contact customer support for assistance.

Q: Can I modify the device for custom applications?
- A: No, any changes or modifications not approved by Emerson could void the user’s authority to operate the equipment.

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Draft | Not for Distribution

Instruction Manual Supplement
D104812X012

DVC7K-H Digital Valve Controller
March 2025

Spectrum Approvals
FisherTM FIELDVUETM DVC7K-H Digital Valve Controllers
Federal Communications Commission (FCC)
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following conditions: This device may not cause harmful interference. This device must accept any interference received, including interference that may cause undesired operation. This device must be installed to ensure a minimum antenna separation distance of 20 cm / 7.9 in. from all persons. Changes or modification to the equipment not expressly approved by Emerson could void the user’s authority to operate the equipment.
Innovation, Science, and Economic Development (ISED)
English This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s licence-exempt RSS(s). Operation is subject to the following two conditions:
1. This device may not cause interference. 2. This device must accept any interference, including interference that may cause undesired operation of the device.
French L’émetteur/récepteur exempt de licence contenu dans le présent appareil est conforme aux CNR d’Innovation, Sciences et Développement économique Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux conditions suivantes :
1. L’appareil ne doit pas produire de brouillage. 2. L’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le fonctionnement.

Draft | Not for Distribution

DVC7K-H Digital Valve Controller
March 2025

Instruction Manual Supplement
D104812X012

Related Documents
· Fisher FIELDVUE DVC7K-H Digital Valve Controller Quick Start Guide (D104766X012) · Fisher FILEDVUE DVC7K-H Digital Valve Controller Instruction Manual (D104767X012) All documents are available from your Emerson sales office or at Fisher.com.

Fisher.com
Facebook.com/FisherValves
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D104812X012 © 2025 Fisher Controls International LLC. All rights reserved.
Neither Emerson, nor any of its affiliated entities assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Fisher and FIELDVUE are marks owned by one of the companies in the Emerson business unit of Emerson Electric Co. Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Emerson Marshalltown, Iowa 50158 USA Sorocaba, 18087 Brazil Cernay, 68700 France Dubai, United Arab Emirates Singapore 128461 Singapore
www.Fisher.com

Introduction

1.1 Installation, Pneumatic and Electrical
Connections and Initial Configuration
Refer to the DVC7K-H Quick Start Guide (D104766X012) for DVC7K installation, connection and
initial configuration information. If a copy of this Quick Start Guide is needed, scan or click the
QR code below, contact your Emerson sales office, or visit our website at Fisher.com.
Scan for Installation Documents
and Field Support
emrsn.co/FieldSupportDVC7K
NOTE
The digital valve controller is normally powered by a control system output channel. Shielded cable for
loop, position transmitter, and switch wiring is required to ensure proper operation in electrically noisy
environments.
1.2 Scope of the Manual
This instruction manual is a supplement to the DVC7K-H Quick Start Guide (D104766X012).
This instruction manual includes product specifications, reference materials, custom setup
information, maintenance procedures and replacement part details.
This instruction manual describes using an Emerson handheld communicator and the Local
User Interface (LUI) to set up and calibrate the instrument.
! WARNING
Do not install, operate or maintain a DVC7K digital valve controller without
being fully trained and qualified in valve, actuator and accessory installation,
operation and maintenance. To avoid personal injury or property damage, it is
important to carefully read, understand and follow all contents of this manual,
including all safety cautions and warnings. If you have any questions about these
instructions, contact your Emerson sales office before proceeding.
1.3 Conventions Used in this Manual
Navigation paths are included for procedures and parameters that can be accessed using the
Device Description (DD) with a handheld communicator or the Local User Interface (LUI).
For example, to access Guided Setup:
Handheld Communicator (DD) Device Settings > Setup Overview > Guided Setup
Local User Interface (LUI) Configure > Guided Setup

Refer to Appendix B for handheld communicator menu trees and Appendix C for the Local
User Interface flow chart.
1.4 Description
DVC7K digital valve controllers (Figure 1 and 2) are communicating, microprocessor‐based
current‐to‐pneumatic instruments. In addition to the traditional function of converting an
input current signal to a pneumatic output pressure, the DVC7K digital valve controller, using
the HART® communications protocol, gives easy access to information critical to process
operation. You can gain information from the principal component of the process, the control
valve itself, using the Local User Interface (LUI) at the valve or a Device Description at the valve,
at a field junction box or at the operator’s console within the control room. Additionally, an
option is available which provides isolated circuitry for a valve position transmitter (for separate
valve position feedback) and two integrated switches that can be set as limit switches or alert
switches.
Figure 1. FIELDVUE DVC7K Digital Valve Controller Mounted on a
Fisher Sliding-Stem Valve Actuator
X1969-1
Figure 2. FIELDVUE DVC7K Digital Valve Controller Mounted to a Fisher 8590 Control Valve

Diagnostic information is available to aid you when troubleshooting. Input and output
configuration parameters can be set and the digital valve controller can be calibrated.
Using the HART protocol, information from the field can be integrated into control systems or
be received on a single loop basis.
The DVC7K digital valve controller is designed to directly replace standard pneumatic and
electro‐pneumatic valve mounted positioners.
1.5 Specifications
! WARNING
Refer to Table 1 for specifications. Incorrect configuration of a positioning instrument
could result in the malfunction of the product, property damage or personal injury.
Specifications for DVC7K digital valve controllers are shown in Table 1.
Table 1. Specifications
Available Mounting Supply Pressure(1)
■ Direct actuator mounting to Fisher 657i/667i or
GX actuators
■ Integral mounting to Fisher sliding-stem and
rotary actuators
■ Quarter‐turn rotary actuators
DVC7K digital valve controllers can also be
mounted on other actuators that comply with
IEC 60534‐6‐1, IEC 60534-6‐2, VDI/VDE 3845 and
NAMUR mounting standards.
Minimum Recommended: 0.3 bar / 5 psig higher
than maximum actuator requirements
Maximum: 10.0 bar / 145 psig or maximum pressure
rating of the actuator, whichever is lower
Supply medium must be clean, dry and noncorrosive
Per ISA Standard 7.0.01
A maximum 40 micrometer particle size in the air
system is acceptable. Further filtration down to 5
micrometer particle size is recommended. Lubricant
content is not to exceed 1 ppm weight (w/w) or
volume (v/v) basis. Condensation in the air supply
should be minimized.
Pressure dew point: At least 10 °C less than the
lowest ambient temperature expected
Per ISO 8573-1
Maximum particle density size: Class 7
Oil content: Class 3
Pressure dew point: Class 3
Communication Protocol
HART 7
Input Signal
Point‐to‐Point
Analog Input Signal: 4 to 20 mA DC, nominal;
split ranging available
Minimum voltage available at instrument
terminals must be 10.2 V DC for analog control,
10.7 V DC for HART communication
Minimum Control Current: 4.0 mA
Minimum Current without Microprocessor
Restart: 3.8 mA
Maximum Voltage: 30 V DC
Overcurrent protected
Reverse Polarity protected
24 V DC (On/Off only)
Instrument Power: 11 to 30 V DC at 10 mA
Reverse Polarity protected
Output Signal
Pneumatic signal, up to full supply pressure
Maximum Span: 9.5 bar / 140 psig
Action: ■ Double, ■ Single Direct or ■ Reverse

1.6 Related Documents
This section lists other documents containing information related to the DVC7K digital valve
controller. These documents include:
• Fisher FIELDVUE DVC7K-H Digital Valve Controller Product Bulletin (D104765X012)
• Fisher FIELDVUE DVC7K-H Digital Valve Controller for On/Off Applications
Product Bulletin (D104791X012)
• Fisher FIELDVUE DVC7K Digital Valve Controller and Magnet Array Dimensions
(D104795X012)
• Fisher FIELDVUE DVC7K-H Digital Valve Controller Quick Start Guide (D104766X012)
• North American Hazardous Area Approvals, Fisher FIELDVUE DVC7K-H Digital Valve
Controllers (D104770X012)
• IECEx/ATEX/UKEX Hazardous Area Approvals, Fisher FIELDVUE DVC7K-H-C-D Digital Valve
Controllers (D104771X012)
• HART Field Device Specification for FIELDVUE DVC7K (D104788X012)
• FIELDVUE Digital Valve Controller Split Ranging (D103262X012)
• Implementation of Lock‐in‐Last Strategy (D103261X012)
• Using FIELDVUE Instruments with the Smart Wireless THUM Adapter and a HART Interface
Module (HIM) (D103469X012)
• Using FIELDVUE Instruments with the Smart HART Loop Interface and Monitor (HIM)
(D103263X012)
• Audio Monitor for HART Communications (D103265X012)
• Fisher HF340 Filter Instruction Manual (D102796X012)
• Fisher LC340 Line Conditioner Instruction Manual (D102797X012)
• AMS Trex Device Communicator User Guide
All documents are available from your Emerson sales office or at Fisher.com.
1.7 Educational Services
Emerson Educational Services
Phone: +1-800‐338‐8158
e‐mail: education@emerson.com
emerson.com/mytraining.

Security

NOTICE
Physical security is an important part of any security program and is fundamental to
protecting your system. Unauthorized personnel may potentially cause significant
damage to and/or misconfiguration of end users equipment. This could be intentional
or unintentional and must be protected against by restricting access of unauthorized
personnel in your facility.
• The DVC7K digital valve controller has several features to help protect against unintentional
configuration changes:
— DVC7K Signed Firmware
— Write Protection (page 15)
— Cannot be connected directly to a network and cannot access the worldwide internet
• If physically unsecured, any device in the field is vulnerable to a physical attack; safety and
security procedures must include mitigation by physical security controls.
• The following are unsecured, unencrypted inputs and outputs used by the DVC7K digital
valve controller:
— Input signal
— Outputs – two solid state dry contact switches and one position transmitter
NOTE
Outputs only applicable if the device was purchased with I/O options.
— Supply pressure
— Output pressure to actuator
— HART – used for digital communication
— Local User Interface (LUI) and LED indicator – used for local calibration
• The following are secured inputs and outputs used by the DVC7K digital valve controller:
— Internal serial port – intended for only Emerson personnel’s use to upgrade firmware.
• The DVC7K has optional applications for configuration and data viewing. When such
applications are used, they must run on devices that are configured according to local
security policies.
• The device has been developed using secure coding principles and procedures, including
threat modeling and security specific testing. It has several interfaces for configuration,
with each of them having an option to disable write options.
• There are multiple ways to configure the device, including:
— The Local User Interface (LUI).
— The FDI (Field Device Integration) package or DD (Device Description) used with asset manager software such as AMS Device Manager or a handheld communicator such as Emerson Trex.

• Product Operation Best Practices:
— Ensure that operation personnel are trained both on local security policies and the
secure operation of the DVC7K digital valve controller.
— It is recommended that you enable write protection after configuration is complete.
— Operate the device within a controlled and secured physical environment.
— Operate the DVC7K digital valve controller and the FDI package/DD host within a
controlled and secured network environment.
— Configure the FDI package/DD host to allow users to have least privilege access to the
DVC7K digital valve controller, providing access to only what is absolutely required to
perform their job function.
— Apply security patches and updates as they are released.
NOTE
Work with your Emerson sales office to stay informed and obtain access to security patches and updates.
• Report security incidents and potential product vulnerabilities at:
https://go.emersonautomation.com/reportvulnerability_en
• Password Management Best Practices:
— Manage FDI package/DD host user passwords per local security policy.
• Product Disposal Guidelines
When the device needs to be disposed of, consider the following aspects of device removal:
— Identify whether the device can be reused in another part of the process or for testing
or training purposes.
— Sanitize the following data stored on the instrument with the latest industry
recommended methods.
1. Spec Sheet/Configuration Data: To restore the configuration back to factory defaults, run
the Restore Factory Configuration method defined on page 74. Review the Specification
Sheet parameters with the FDI (Field Device Integration) package or DD (Device
Description) to verify all configuration parameters with sensitive data are removed.
2. Event Log Data: Open the Event Log with the FDI (Field Device Integration) package or DD
(Device Description) and run the Clear Event Log method.
NOTE
The Emerson diagnostic dataset(s) and debug logs will not be removed with the above steps and will
remain on the device. However, no process related information is contained in this data.
If the device will not be reused, follow local disposal policy.

Wiring Practices

3.1 Control System Requirements
There are several parameters that should be checked to ensure the control system is
compatible with the DVC7K digital valve controller.
HART Filter/Line Conditioner
Depending on the logic solver or control system and Application Mode of the DVC7K digital
valve controller, a line conditioner or HART filter may be required. See Table 2.
NOTE
The DVC7K is not a SIL capable device.
Table 2. HART Filter/Line Conditioner Requirement by System and Mode
Application Mode Control System or
Logic Solver HART Filter Required? Line Conditioner
Required?
4 to 20 mA
Point-to-Point Loop
PROVOX™, RS3™,
DeltaV™, Ovation™ No No
All Others Consult Sales Office No
24 V DC
Multi-Drop Loop All No Yes
The HF340 HART filter and LC340 Line Conditioner are passive devices that are inserted in
the field wiring of the HART loop. A filter or line conditioner is normally installed near the
field wiring terminals of the system I/O (see Figure 3). Its purpose is to effectively isolate the
system output from modulated HART communication signals and raise the impedance of the
system to allow HART communication. For more information, refer to the HF340 HART filter
(D102796X012) or LC340 Line Conditioner (D102797X012) instruction manual.
Voltage Available
The voltage available at the DVC7K digital valve controller must be at least 10.5 V DC.
The voltage available at the instrument is not the actual voltage measured at the instrument
when the instrument is connected. The voltage measured at the instrument is limited by the
instrument and is typically less than the voltage available.
As shown in Figure 3, the voltage available at the instrument depends upon:
• the control system compliance voltage
• if a filter, wireless THUM adapter or intrinsic safety barrier is used, and
• the wire type and length.
The control system compliance voltage is the maximum voltage at the control system output terminals at which the control system can produce maximum loop current.

Figure 3. Determining Voltage Available at the Instrument

Calculate Voltage Available at the Instrument as follows:
Control system compliance voltage
– Filter voltage drop (if used) (1)
– Intrinsic safety barrier resistance (if used) x maximum loop current)
– Smart Wireless THUM adapter voltage drop (if used)(2)
– Total loop cable resistance x maximum loop current
= Voltage available at the instrument(3)

Example Calculation
18.5 V (at 21.05 mA)
– 2.3 V (for HF340 filter)
– 2.55 V (121 ohms x 0.02105 A)
– 1.01 V (48 ohms x 0.02105 A for
1000 feet of Belden 9501 cable)
= 15.19 V, available — if safety barrier (2.55 V) is not used

Notes:
1. Obtain filter voltage drop. The measured drop will be different than this value. The measured filter
voltage drop depends upon control system output voltage, the intrinsic safety barrier (if used), and
the instrument. See Note 3.
2. The voltage drop of the THUM adapter is linear from 2.25 V at 3.5 mA to 1.2 V at 25 mA.
3. The voltage available at the instrument is not the voltage measured at the instrument terminals. Once the instrument is connected, the instrument limits the measured voltage to approximately 8.0 to 9.5 V.

The voltage available at the instrument may be calculated from the following equation:
Voltage Available = [Control System Compliance Voltage (at maximum current)] – [filter voltage
drop (if a HART filter is used)] – [total cable resistance x maximum current] – [barrier resistance
x maximum current].
The calculated voltage available should be greater than or equal to 10.5 V DC.
Table 3 lists the resistance of some typical cables.
The following example shows how to calculate the voltage available for a Honeywell™ TDC2000
control system with a HF340 HART filter and 1000 feet of Belden™ 9501 cable:
Voltage available = [18.5 V (at 21.05 mA)] – [2.3 V] – [48 ohms x 0.02105 A] Voltage available = [18.5] – [2.3] – [1.01] Voltage available = 15.19 V

Maximum Cable Capacitance
The maximum cable length for HART communication is limited by the characteristic
capacitance of the cable. Maximum length due to capacitance can be calculated using the
following formulas:
Length(ft) = [160,000 – Cmaster(pF)] ÷ [Ccable(pF/ft)] Length(m) = [160,000 – Cmaster(pF)] ÷ [Ccable(pF/m)] where:
160,000 = a constant derived for FIELDVUE instruments to ensure that the HART network RC
time constant will be no greater than 65 μs (per the HART specification).
Cmaster = the capacitance of the control system or HART filter
Ccable = the capacitance of the cable used (see Table 3)
The following example shows how to calculate the cable length for a Foxboro™ I/A control
system (1988) with a Cmaster of 50, 000 pF and a Belden 9501 cable with characteristic
capacitance of 50pF/ft.
Length(ft) = [160,000 – 50,000pF] ÷ [50pF/ft] Length = 2200 ft.
The HART communication cable length is limited by the cable characteristic capacitance. To increase cable length, select a wire with lower capacitance per foot. Contact your Emerson sales office for specific information relating to your control system.

Configuration

4.1 Guided Setup
Handheld Communicator (DD) Device Settings > Setup Overview > Guided Setup
Local User Interface (LUI) Configure > Guided Setup
To quickly setup the instrument, Guided Setup will guide you through the following steps.
1. Select the Language (LUI only).
2. Provide Construction Information which is used to configure the unique parameters for
the actuator, instrument and accessory construction.
3. Relay Adjustment (Relay A only)
4. Auto Calibration is used to establish the limits of physical travel. During this process, the
valve will fully stroke from one travel extreme to the other.
5. Apply Custom Configuration (factory purchased custom configurations only).
6. Return to Previous State (Instrument Mode and Write Protection).
NOTE
Refer to the DVC7K Quick Start Guide (D104766X012) for detailed instructions on Guided Setup.
4.2 Manual Setup
Handheld Communicator (DD) Device Settings > Setup Overview
Local User Interface (LUI) Configure
Manual Setup allows you to configure the digital valve controller to your application. Table 4
lists the default settings for a standard factory configuration. You can adjust actuator response,
set the various modes, alerts, ranges, travel cutoffs and limits. You can also change the Write
Protection mode.
NOTE
Refer to Table 11 for Default Alert Settings.

Instrument Mode
There are three instrument modes for the DVC7K; Automatic (AUTO), Manual (MAN) and Local
Override (Override).
• Automatic is the normal operating mode such that the instrument follows the control
signal.
• Manual is required in some cases to modify configuration parameters or to run diagnostics.
• Local Override occurs either when the device latches to the Zero Power Condition on
startup or when the input current is too low while the Instrument Mode is in Manual. If the
instrument is latched to the Zero Power Condition, change the Instrument Mode to Manual
to clear the latch. If the input current is too low, increase the input current to clear the
latch.
NOTE
In the DVC6200 digital valve controller, Automatic was referred to as In Service and Manual was referred
to as Out of Service.
NOTE
Some changes that require the instrument to be in Manual will not take effect until the instrument is
placed back in Automatic or the instrument is restarted.
Write Protection
There are three Write Protection modes for the DVC7K: Off, On with LUI Validation and On
without LUI Validation.
The default setting is Off. If Write Protection is On with LUI Validation, the device prevents
configuration and calibration changes to the instrument and can only be turned Off from the LUI. If Write Protection is On without LUI Validation, the device prevents configuration and calibration changes to the instrument but can be turned Off from the LUI or from a handheld communicator.

4.3 Specification Sheet
Configure the following Instrument parameters in the Device Description:
Positioner
Handheld Communicator (DD) Device Settings > Setup Overview > Positioner
Identification
• Tag — A tag name up to 8 characters is available for the instrument. The Tag is the easiest
way to distinguish between instruments in a multi‐instrument environment. Use the Tag to
label instruments electronically according to the requirements of your application. The Tag
you assign is automatically displayed when the Device Description establishes contact with
the digital valve controller.
• Long Tag — A Long Tag name up to 32 characters is available for the instrument. The Long
Tag functions exactly like Tag.
• Polling Address — If the digital valve controller is used in point‐to‐point operation, the
Polling Address is 0. When several devices are connected in the same loop, such as for split
ranging, each device must be assigned a unique polling address. The Polling Address is
set to a value between 0 and 63 for HART 7. To change the polling address, the instrument
must be in Manual.
• Manufacturer — The manufacturer of the positioner
• Device Type — The Device Type for the positioner
• Instrument Serial Number — Enter the serial number on the instrument nameplate, up to 12 characters.
• Device Identifier — A unique identifier for the positioner
• Message — Enter any message with up to 32 characters. Message provides the most specific user‐defined means for identifying individual instruments in multi‐instrument environments.
• Descriptor — Enter a description for the application with up to 16 characters. The description provides a longer user‐defined electronic label to assist with more specific instrument identification than is available with the HART tag.
Tiers
• Control Tier — There are two tiers: Throttling Control (TC) and Discrete Control (DC). TC supports both throttling and on/off application modes whereas DC only supports the on/ off application mode.
• Application Mode — If the Control Tier is TC, users can take the instrument into Manual mode and select if the instrument behaves as a throttling or on/off valve.

Revisions
• Hardware Revision — Revision number of the instrument hardware.
• Device Revision — Revision number of the device.
• HART Protocol Revision — Revision number of the HART protocol.
• Main Firmware Revision — Revision number of the firmware and the date that firmware
revision was released.
• Software Revision — Revision number of the Device Description (DD).
Units
• Pressure — Defines the output and supply pressure units in either psi, bar, kPa or kg/cm2.
• Temperature — Degrees Fahrenheit or Celsius. The temperature measured is from a
sensor mounted on the digital valve controller’s printed circuit board.
• Input Current — Permits defining the Input Current units in mA or percent of 4 to 20 mA
range.
Instrument Time
• Edit Instrument Time Method — The method, Edit Instrument Time, permits setting the
instrument clock. When alerts are stored in the alert record, the record includes the time
and date. The instrument clock uses a 24‐hour format.
• Current Date — Displays the instrument clock’s current date.
• Current Time — Displays the instrument clock’s current time.
Positioner Performance
Handheld Communicator (DD) Device Settings > Setup Overview > Positioner Performance
Travel Control
• Input Current — Displays the current input current.
• Relay Type — There are sixteen relay options to select from. The relay type is printed on the
label affixed to the relay body. The label will indicate whether the relay is a low bleed and/or
an extreme temperature version.
Standard Relays
1. Relay C
2. Relay B
3. Relay A as Double
4. Relay A as Single
Low Bleed Relays
5. Relay C LB
6. Relay B LB
7. Relay A LB as Double
8. Relay A LB as Single

Extreme Temperature Relays
9. Relay C XT
10. Relay B XT
11. Relay A XT as Double
12. Relay A XT as Single
Extreme Temperature and Low Bleed Relays
13. Relay C XTLB
14. Relay B XTLB
15. Relay A XTLB as Double
16. Relay A XTLB as Single
• Zero Power Condition — The position of the valve (open or closed) when the electrical power to the instrument is removed. Zero Power Condition (ZPC) is determined by relay type, as shown in Figure 5.
Figure 5. Zero Power Condition

• Restart Latch Options — There are two Restart Latch Options: Off or Zero Power. If Zero
Power is selected, on power loss the device will move and latch to the Zero Power Condition
on power up and will require you to unlatch it.
• Restart Latch Status — Identifies in the Restart Latch is Inactive or Active.
Cutoff/Limit High
• Cutoff/Limit High Action — Allows the user to control the behavior when the setpoint is
high. Users have the following options: disabled, cutoff or limit.
• Cutoff High Trip Point — This is the point within the calibrated travel range above which the
Cutoff is in effect when Cutoff/Limit High Action is Cutoff. A Cutoff High Trip Point of 99.5%
is recommended to ensure the valve goes fully open.
• Travel Limit High Point — The maximum value that the setpoint will reach when the Cutoff/
Limit High Action is set to Limit.
• Cutoff Rate High — This setting allows the valve to ramp at the configured rate to the high
travel extreme when the Cutoff High Trip Point is reached. This provides a controlled ramp
into the open travel stop.

Cutoff/Limit Low
• Cutoff/Limit Low Action — Allows the user to control the behavior when the setpoint is low.
Users have the following options: disabled, cutoff or limit.
• Cutoff Low Trip Point — This is the point within the calibrated travel range below which the
Cutoff is in effect when Cutoff/Limit Low Action is Cutoff. A Cutoff Low Trip Point of 0.5% is
recommended to help ensure maximum shutoff seat loading.
• Travel Limit Low Point — The minimum value that the setpoint will reach when the Cutoff/
Limit Low Action is set to Limit.
• Cutoff Rate Low — This setting allows the valve to ramp at the configured rate to the low
travel extreme when the Cutoff Low Trip Point is reached. This provides a controlled ramp
into the seat in order to minimize seat damage.
Characterization (Throttling Application Mode Only)
• Input Characterization
Input Characterization defines the relationship between the travel target and ranged set point.
Ranged set point is the input to the characterization function. If the zero power condition
equals closed, then a set point of 0% corresponds to a ranged input of 0%. If the zero power
condition equals open, a set point of 0% corresponds to a ranged input of 100%. Travel target
is the output from the characterization function.
Users can select from the three fixed input characteristics shown in Figure 6 (Linear, Equal
Percentage or Quick Opening) or select a Custom characteristic. Figure 6 shows the
relationship between the travel target and ranged set point for the fixed input characteristics,
assuming the Zero Power Condition is configured as closed.
With input characterization, you can modify the overall characteristic of the valve and
instrument combination. Selecting an equal percentage, quick opening or custom (other
than the default of linear) input characteristic modifies the overall valve and instrument
characteristic. However, if you select the linear input characteristic, the overall valve and
instrument characteristic is the characteristic of the valve, which is determined by the valve
trim (i.e., the plug or cage).
• Custom Characterization Table
You can specify two 21 point characterizations on a custom characteristic curve. Each point defines a travel target, in % of ranged travel, for a corresponding set point, in % of ranged set point. Set point values range from -25% to 125%. Before modification, the custom characteristic is linear.

Figure 6. Travel Target Versus Ranged Set Point, for Various Input Characteristics (Zero Power Condition = Closed)

Documents / Resources

EMERSON DVC7K-H Digital Valve Controller [pdf] Instruction Manual
DVC7K-H, DVC7K-H Digital Valve Controller, Digital Valve Controller, Valve Controller, Controller

References

User Manual

EMERSON DVC7K-H Digital Valve Controller

Specifications

Product Usage Instructions