5/12/2017
TECH-538/D.W.O. 23160
Page 7 of 189
1
Introduction
The Westlock ICoT
The Westlock ICoT – Intelligent Valve Positioner
is an advanced performance positioner with features
that include high accuracy, ease of set-up with one-touch auto-tune calibration, linear or rotary mounting
and non-contact feedback for the positioner, integral feedback position transmitter, and comprehensive
diagnostics. The ICoT provides a unique combination of accuracy, flexibility, easy maintenance, low air
consumption, and low power consumption.
The ICoT has no linkages
, levers or connecting rods from the positioner to the controlled element. Valve
position sensing is performed totally by non-contacting means based upon a rugged magnetic sensor.
Note: consult Westlock for other position sensor options like ruggedized potentiometers or 4-20mA
output position sensors like LVDT, guided wave, magnetostrictive etc.
The ICoT can also be mounted remotely
(up to a distance of 200 feet) from the device it is controlling.
The ICoT local LCD configuration tree
is so comprehensive that a hand held is rarely needed during
configuration, field maintenance, and operation.
The ICoT LCD
indicates valve position, set-point, calibration status, alarms status, and whether the ICoT is
in local or fieldbus control. Error messages are displayed on the local LCD display and communicated to
the Host system via fieldbus.
The ICoT on board LED’s
provide further diagnostic and quick information about communication status
and other errors.
What this document contains
In the following pages of this document basic information about four different processes involved in the
installation, operation as well as the configuration of the ICoT valve positioner are described:
•
Mechanical and Pneumatic Installation (Valve Setup)
: The valve assembly is generally divided in
three parts: the valve, the actuator and the positioner. The positioner’s brackets, tubbing and
fittings as well as the flow capacity have to match the physical characteristics of the actuator,
valve, and the process.
•
Power supply and Field wiring:
When HART, PROFIBUS PA and FOUNDATION Fieldbus
technologies are used, in order to enable the exchange (communication) of the SP and PV
values
between the positioner and host systems, the ICoT user should not only power the positioner but
also install the communication interfaces and other devices.
•
System Integration:
The host system (from the positioner configuration point of view) can be a
PC computer, a pre-configured workstation, a control system, a DCS or a hand held. Here is
where the device drivers (called DDs or EDDs) are going to be installed.
•
Calibration Instructions:
There are three different ways to start and monitor the calibration of
the ICoT Positioner. Local display and pushbuttons (not requiring network communication), using
a Handheld Communicator, and using Host Control System user interface.
1
SP (Set point or desired position), PV (Process variable or measured position)
2
This is an illustration only. Control Systems architecture, components and topology may vary.
