Product data

CWGFC June 2012
www.EmersonProcess.com/Remote 5
 Audit Trail Alarm and Event Storage
ControlWave GFC keeps an Audit Trail Buffer capable of
storing the most recent 500 Alarms and the most
recent 500 Events. Internally, these buffers are
maintained separately to prevent recurring alarms from
overwriting configuration audit data. Externally, they
are reported to the user as a single entity. Both operate
in a circular fashion with new entries overwriting the
oldest entry when the buffer is full. The following
circumstances cause an entry to be made in the Audit
Trail Buffer:
 Any operator change to a ControlWave GFC
configuration variable
 Any change in the state of a ControlWave GFC
alarm signal
 A system restart
 Certain other system events
 Includes a nominations function
 Allows you to select engineering units from a broad
variety, including English and metric
 Interfaces to a chromatograph and provides energy
throughput as well as composition information (note
that same port is allocated for either a chromatograph
or external transmitters.
 Self Diagnostics
ControlWave GFC periodically runs a series of
diagnostics to verify the operational status of various
system components. The tests include transducer
parameters, main and backup battery voltages,
software sanity checks, and other indications of system
health. An appropriate alarm is generated if any test
fails.
Communication Port Configuration
for the Standard Application
Program
COM1 — See Specifications in the Table on page 8. The external
PC port connector, accessible on the bottom of the front
door, is connected to this port on the CPU.
COM2 — See Specifications in the Table on page 8. The
standard application program is compatible with an external
communication device (via RS 232) or standard model
radio. If a standard model radio is included, the model will
also include a cable that connects this port, on the CPU, to
the RS 232 port on the radio.
COM3 — See Specifications in the Table on page 8. The
standard application program assumes that 3808 MVT
multivariable transmitters for meter run measurement are
to be interfaced to this port.
The standard application program supports a
chromatograph, but a Flash Configuration change is
required to allow the chromatograph to be interfaced to
COM3.
Power System, Charge Regulator
and AUX Output
You can choose from a variety of internal power systems
that includes lithium batteries and rechargeable lead acid
cell batteries, the latter of which are matched with solar
panels as charging sources.
All associated electronics are included on the
Processor/Main Electronics board, which is located on the
left-hand side of the enclosure.
Related to the power system, a charge regulator circuit and
an auxiliary output (AUX Output) are standard in
ControlWave GFC.
Bendable RTD
You can choose a bendable RTD that is attached to the
ControlWave GFC via an armored cable of 6-foot, 15-foot or
25-foot length. The individual wires attach to a terminal
block on the Processor/Main Electronics board. The terminal
block accepts up to three wires.
Normally, this RTD is used to provide the process
temperature input, but the standard application program
also allows you to select an external temperature
transmitter, instead.
The bendable RTD is a “one size fits all” solution that is
perfect for most applications and excellent for depot-level
inventory situations in which the ultimate installation (and,
therefore, thermowell depth) is not necessarily known.
The 12-inch probe can quickly be inserted in a thermowell,
whereupon you can tighten the included fitting to lock it in
place and bend the excess length out of the way. Note that a
thermowell is required for this bendable RTD.
RTD Interface Information
A three-wire platinum RTD per DIN 43760 is supported. The
temperature, T, in degrees Celsius is calculated using the
Resistance vs. Temperature Tables according to the DIN EN
60751 standard for Class A and B RTDs. ControlWave GFC
supports the full range in the DIN standard, -40 to 660ºC.
The DIN EN 60751 equation is:
R
T
= R
o
* (1 + AT +BT
2
)
Where:
A = 3.9083 x 10
-3
ºC
-1
B = -5.775 x 10
-7
ºC
-2
R
o
= 100 Ω