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7 ND90 71 en
Extensive set of off-line tests with accurate key
figure calculations
Fast notifications using on-line alarms
Condition monitoring tool available
Real time monitoring of valve control parameters
1.2
ND7000
1.2.1 Key features
Benchmark control performance on rotary and linear
valves
Reliable and robust design
Ease of use
Language selection: English, German and French
Local / remote operation
Expandable architecture
Basic diagnostics including
Self-diagnostics
Online diagnostics
Extended off-line tests
1.2.2 Total cost of ownership
Low energy and air consumption
Retro-fit to existing installations (Neles or 3rd party)
1.2.3 Minimised process variability
Linearisation of the valve flow characteristics
Excellent dynamic and static control performance
High-speed of response
Accurate internal measurements
1.2.4 Easy installation and configuration
Same unit for linear and rotary valves, double and
single-acting actuators
Simple calibration and configuration
using Local User Interface (H)
using DTM or EDD in a remote location (H, F)
see 375/475 menu structure from annex 1
Low power design enables installation to all com-
mon control systems
Possibility to mount also on valves that are in pro-
cess with 1-point calibration feature
1.2.5 Open solution
Metso is committed to delivering products that freely interface
with software and hardware from a variety of manufacturers;
and the ND7000 is no exception. This open architecture allows
the ND7000 to be integrated with other field devices to give an
unprecedented level of controllability.
FDT based multi-vendor support configuration
ND9000 DTM download page:
www.metso.com/ND9000
1.2.6 Product reliability
Designed to operate in harsh environmental condi-
tions
Rugged modular design
Excellent temperature characteristics
Vibration and impact tolerant
IP66 enclosure
Protected against humidity
Maintenance free operation
Resistant to dirty air
Wear resistant and sealed components
Contactless position measurement
2
ND9000 AND ND7000 INTELLIGENT
VALVE CONTROLLER WITH DIFFERENT
COMMUNICATION PROTOCOLS
2.1
General
This manual incorporates Installation, Maintenance and
Operation Instructions for the Metso ND9000 and ND7000
intelligent valve controller. The ND9000 and ND7000 may
be used with either cylinder or diaphragm type pneumatic
actuators for rotary or linear valves.
2.2
Technical description
ND9000H and ND7000H
The ND9000H and ND7000H are a 4–20 mA loop-powered
microcontroller-based intelligent valve controllers. The
devices operate even at 3.6 mA input signal and communi-
cates via HART.
ND9000F
The ND9000F is a fieldbus powered microcontroller-based
intelligent valve controller.
ND9000P
The ND9000P is a fieldbus powered microcontroller-based
intelligent valve controller.
All versions
All devices contain a Local User Interface enabling local
configuration.
Independently from the communication protocol, the valve
position is controlled by the powerful 32-bit microcontrol-
ler. The measurements include:
Input signal
Valve position with contactless sensor
Actuator pressures, 2 independent measurements
Supply pressure
Spool valve position
Device temperature
Advanced self-diagnostics guarantees that all measure-
ments operate correctly. Failure of one measurement does
not cause the valve to fail if the input signal and position
measurements are operating correctly. After connections of
electric signal and pneumatic supply the micro controller
(μC) reads the input signal, position sensor (α), pressure
sensors (Ps, P1, P2) and spool position sensor (SPS). A differ-
ence between input signal and position sensor (α) measure-
ment is detected by the control algorithm inside the μC.
The μC calculates a new value for prestage (PR) coil current
based on the information from the input signal and from
the sensors. Changed current to the PR changes the pilot
pressure to the spool valve. Reduced pilot pressure moves
the spool and the actuator pressures change accordingly.
The spool opens the flow to the driving side of the double
diaphragm actuator and opens the flow out from the other
NOTE:
The selection and use of the valve controller in a specific
application requires close consideration of detailed
aspects. Due to the nature of the product, this manual
cannot cover all the likely situations that may occur when
installing, using or servicing the valve controller.
If you are uncertain about the use of the controller or its
suitability for your intended use, please contact Metso’s
Automation business for more information.
