 |
Reduce
plant downtime and cut maintenance costs
The AXIOM AS-Interface and HART models feature on-board diagnostics that
predict potential automated valve malfunctions. And, plant downtime may be
reduced by repairing automated valves during planned shutdowns instead of
process operations. If problems occur during process operation, maintenance
personnel will be aided by rapidly locating failure causes, consequently
speeding up valve repair and operation renewal. |
Identify Potential Problems
|
Check Air
Supply Pressure
Alerts are activated if low or high levels exceed preset thresholds
that would threaten pneumatic valve or actuator performance.
Determine Solenoid Condition
Voltage and current levels are monitored to determine the health of
the solenoid coil whenever energized.
Monitor Pneumatic Spool
and Pilot Valve Operation
Pneumatic valve position is monitored to determine proper
shifting performance when the solenoid is energized and de-energized. |
Remotely Calibrate
Set-up may be performed through control system to establish
end-of-travel indication.
Field Identify with “Winking”
To positively confirm the field device identity, the control room may
initiate the “wink” function that flashes both open and closed LEDs
without affecting valve operation.
Local Trouble-Shooting Display
Device LED array identifies problem sources for rapid
trouble-shooting and maintenance at the valve/actuator site. |
AXIOM with HART (AMI71)
Features Comprehensive Predictive Diagnostics
The AMI71 is a valve
monitoring and control device
for discrete quarter-turn automated valves. Used in
conventional applications, it has the added capability of
providing diagnostic information for the pilot solenoid,
spool valve, and actuator. And, the device stores
historical data on each open and closed operation.
Excessive Valve Torque Changes
Open and closed breakaway actuator differential
pressures are measured and compared to baseline
levels during each operation. This enables operators to
observe unusual pressure/torque level trends, which
may ultimately lead to a malfunction.
Erratic Valve/Actuator
Performance
Total travel time and dead time (time between
energizing and initial actuator movement) are measured
during each operation, recorded and compared to the
baseline. This gives maintenance staff additional clues
on potential automated valve problems.
Valve/Actuator End-stop Changes
Exact valve position is continuously measured and may
be used to determine if changes have occurred at end
of travel. Deviations from zero or span endpoints are
graphically portrayed to alert maintenance staff of worn
end-stops. |
 |
Easy Control System Integration
|
System Connections
Two, 2-wire
connections attach to the control system to provide discrete
solenoid control and continuous position monitoring. A standard
24VDC discrete output (DO) powers
and controls the solenoid valve. Intrinsically safe solenoid pilot
may also be selected. A conventional 4 to 20mA analog input (AI)
provides continuous exact valve position feedback into the control
system.
|
Diagnostics
The HART
communication signal is overlaid on the 4 to 20mA analog position
monitoring input. The signal may be read via internal modem in the
DCS system or external modem. External modems may transmit
information to a DCS or to a remote PC via a hardwired or a wireless
connection.
HART Diagnostics Software Integration
Integration to various DCS or asset management systems may be
achieved using open, standardized technologies such as enhanced EDDL
(Electronic Device Description
Language) or FDT/DTM (Field Device Tool/Device Type Manager). Most
DCS vendors use one or both of these technologies, which provides
open access to device intelligence and allows easy use of all
features and benefits available from the AXIOM HART device. |
AXIOM with AS-Interface Diagnostics (AMI71)
for Networking Applications Diagnostics
The AMI96 offers
basic diagnostics for AS-Interface network applications that enables
end-use customers to increase uptime and reduce maintenance costs.
AXIOM AS-Interface diagnostic systems interface with any version 2.1
or greater masters/gateways.
Electrical connections
The Axiom with AS-Interface diagnostics uses standard
(1-31) addressing with a 4DI/4DO profile to maximize the
diagnostic data available via the network. Diagnostic units may be
integrated on the same network as other AS-Interface devices.
Control System Interface
Interface up to 31 AXIOM units into your control system.
Communication bits may be mapped into standard DCS or PLC as
desired. No special software is required. See the StoneL FieldLink
program for information about the cost saving benefits and easy
installation of the AS Interface protocol. |
 |
AMI AMI
|
