Dwyer GFT2 - Manual (Page 10)

Selecting “Yes” will reset the pilot calibration timer back to zero.
Submenu “Signal Conditioner”
A noise reduction filter algorithm (Running Average or Noise Reduction Filter) is
now available in the flow meter when pulsating flow or especially noisy signals are
encountered. The Flow Linearizer algorithm is also available when flow linearity
must be improved.
The following settings are available for “Program Set Point” (see Figure 10):
a) Program Set Point Mode (Tabular entry)
This function determines whether the Program Set Point is Enabled or Disabled.
The following selections are available: Enabled or Disabled. The default entry is
Disabled. Program Set Point Mode selections can be set with the UP and DN
buttons and are accepted by pressing ENT button.
b) Program Set Point Loop Mode (Tabular entry)
This function determines whether Program Set Point Loop is Enabled or Disabled.
If Loop is enabled, when program reaches the last step it wraps around and again
starts execution from the first enabled step. The following selections are available:
Enabled or Disabled. The default entry is Disabled. Program Set Point Loop Mode
selections can be set with the UP and DN buttons and are accepted by pressing
ENT button.
c) PSP Steps Mask (Tabular entry)
Using PSP Steps Mask settings, the user can enable (unmask) or disable (mask)
any step in the program. If the step is masked, the program will skip it and move to
the next enabled step. By default the unit is shipped from the factory with all
program steps enabled (unmasked). A typical display with PSP Steps Mask
selection is shown below.
In the example shown above, all PSP Steps are enabled. Each PSP Step assigned
to a corresponding bit in the PSP Steps Register. In order to change PSP Step
mask settings, the user should select desired stop using UP and DN buttons and
then press RIGHT button. The asterisk will appear/ disappear on the right side of
the corresponding step. The asterisk represents that step is enabled. In order to
disable step, the corresponding asterisk has to be removed. Use ENT button to
accept and save new PSP Steps mask settings in device non volatile memory.
d) PSP Steps Settings (Numerical entry)
Using PSP Steps Settings menu selection, the user can assign required set point
and time values for each step in the program. A typical display with PSP Steps
Settings selection is shown below.
In the example shown above, Step 01 is selected. For each step there are two
parameters: set point value in % FS and time interval in seconds. In order to
change PSP Step settings user should select desired step using UP and DN
buttons and then press ENT button. The cursor in the selected (highlighted)
parameter will start flashing. Use UP, DN, LEFT, RIGHT buttons to adjust desired
value and then press ENT button to accept and save new PSP Step Settings in the
device’s nonvolatile memory.
Submenu “Event Register Menu”
GFT2 is equipped with a self-diagnostic Alarm Event Register which is available via
digital interface and on screen LCD indication. Use the “Diagnostic Menu” to
navigate to “Event Register Menu” menu option.
The following diagnostic events are supported:
NOTE: Any Alarm or Diagnostic events that may have occurred (Event 0 to Event
D) are stored in the internal status register. All detected events (if corresponding bit
in the latch register is not masked) remain stored until the register is manually reset
(by keypad or by means of the serial communication interface). If event
corresponding bit in the latch register is masked (disabled), the event will be
indicated as long as it is active (no latching). The status Alarm Event Register is
mapped to the SCRAM (volatile memory). In case of power interruption, the status
Event Register will be automatically reset.
The following settings are available for “Event Register Menu” (see Figure 10):
a) Event Register Status (Read Only)
Each active Alarm event will be indicated on the LCD screen. Also, the total number
of currently active events will be displayed on the first line (header). A typical display
without active diagnostic and Alarm Events is shown below.
A typical display with two active events is shown below.
If more than 7 events are displayed, the user can use UP and DN buttons to scroll
and see all indicated events. If event is not latched in the Event Latch Mask
register, it may appear and disappear from the status screen, so it will be indicated
as long as the actual event is taking place.
b) Event Latch Mask (Tubular entry)
Using Event Latch Mask settings, the user can enable (unmask) or disable (mask)
latch feature individually for each event. The event is enabled if there is an asterisk
sign [*] set on the right across corresponding event. If event is not latched (no
asterisk across corresponding event) it may appear and disappear from the status
screen, so it will be indicated as long as the actual event is taking place. By default,
the unit is shipped from factory with only one event active: 0 – CPU Temperature
too high. For all other events, the latch feature is disabled. A typical display with
Event Latch Mask selection is shown below.
Figure 19
Figure 20
Event
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Table 5
Diagnostic and Alarm Events Description
CPU Temperature Too High
High Flow Alarm
Low Flow Alarm
Range Between High and Low
Totalizer #1 Exceed Set Event Volume Limit
Totalizer #2 Exceed Set Event Volume Limit
Optical Pulse Output Queue Overflow
Flow Rate Above Limit
Vcc Power Voltage Out of Range
Serial Communication Error
EEPROM Error
Power On Event (Power On Delay Time > 0)
Password Event
Fatal Error
LCD BIT Code
0
1
2
3
4
5
6
7
8
9
A
B
C
D
Figure 21
Figure 22
Figure 23