Daikin DPS016 - Page 71

Changing the System of Units
The transmitter is provided with the system of units set to I-P.
To change to S.I., simultaneously press and release the “UP”
and “DOWN” arrow buttons during normal operation. “IP/SI
UNITS” will be indicated on the LCD display. Press “ENTER”
three times and use the “UP” and “DOWN” arrow buttons until
the system of units desired is indicated. Press the “ENTER”
button to select changes then press “ESC” twice to return to
the normal operating mode. See Appendix, Figure 83 on page
114.
LCD Display Notications
Following a brief initialization at power up, the LCD display
automatically displays airow and temperature as all upper
case (caps) characters. The display provides additional
information on system status and alarm conditions as follows:
Last LCD Character Shown in Lower Case (Probe
Malfunction)
If the last character of the ow rate units on the LCD display is
lower case (for example FPm or CFm), this indicates that an
improper/malfunctioning probe is connected to the transmitter.
All LCD Characters Shown in Lower Case
When all characters of the ow rate units are displayed in lower
case (for example cfm) the transmitter is operating in the Field
Calibration Wizard mode.Daikin McQuay users do not need to
use this function.
LCD Blinks ** LOW ALARM **, ** HIGH ALARM ** or **
TRBL ALARM**
The LCD will alternately ash to indicate an active alarm
condition for the type of alarm that has been set. The LCD
displays airow/temperature readings between the alarm
notications. Alarm will cease when the alarm is cleared.
Converting the Analog Output Signal from FPM to
CFM (MPS to LPS for SI units scaling)
The transmitter is shipped from the factory with analog output
“OUTPUT 1” set to indicate velocity in FPM. To automatically
convert this analog velocity output to volumetric ow (CFM or
LPS), simply set the *OUT1 U/M from FPM (default) to CFM
in the Setup Menu (See Appendix, Figure 81 on page 110). If
you wish to manually convert the velocity output to volumetric
ow (CFM or LPS), simply multiply the indicated output
velocity (in FPM or MPS) by the free area of the air ow probe
installation location (free area × 1000 for SI units when area
is calculated in square meters). For -P sensors, the total free
area is programmed into the probe at the factory and is printed
on the probe hang-tag. For -F and -B sensor probes, determine
the free area following installation in accordance with the
installation guidelines.
NOTE: The full scale analog output (OUTPUT1 ) value is
determined by the FS1 setting within the SETUP
MENU.
Altitude Correction Adjustment
The Altitude Correction Adjustment allows for correction of
airow readings at the installed site altitude and more precise
readings regardless on installed altitude. Refer to the SETUP
MENUS of Figure 88 for the *ALT= menu item, and set this
vale to the installation altitude.
Adjusting The Digital Output Filter
The digital output lter is useful for dampening signal
uctuations resulting from transient wind gusts on outdoor
air intakes or excessive turbulence generated from duct
disturbances. The digital output lter range can be set between
0 (OFF) and 99%. Increasing the lter percentage limits the
allowable change of the output signal. To change the amount
of ltering, enter the Setup menu and set “*FILTER1={desired
value}” as shown in Figure 88.
IMPORTANT
Fluctuations in the airflow output signal are normal.
Laboratory research indicates that dampening true
fluctuations will result in poor control and a larger dead-
band of operation. Therefore, the use of the dampening
filters in control devices is not recommended. Warnings
indicate potentially hazardous situations, which can
result in property damage, severe personal injury, or
death if not avoided.
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