Delta Controls 2HTDCAL - Manual (Page 6)

LOCAL DISPLAY
PERFORMANCE SPECIFICATION :-
The local display / configurator is not connected via the signal loop, but accesses the micro
processor directly. This allows the unit to display a digital representation of the
measured
variables and settings without the inaccuracies or loop loading or an analogue meter.
Temperature Effect :- The local display can operate over the range -30 to +85, but at very
low temperatures the display slows down to allow the characters to be
displayed properly, this is controlled by the microcontroller.
Response Time :- This is dependent upon menu option and temperature
but is typically less than 1 second.
The display is fully protected against RFI effects.
Switch Life :- 10,000,000 operations
PHYSICAL SPECIFICATION :-
The local display / configurator is connected to the top board using a 10 way IDC connector which
carries the information and power to the unit. The case is constructed of 316 stainless steel and
has a keyboard overlay and 'O' ring seal that gives it protection to IEC IP65 with the lid removed.
The keyboard is resistant to most industrial solvents and has full EMI protection. If the overlay
becomes damaged on site the overlay may be replaced in the field.
The display can be turned to any angle within the enclosure to suit the mounting position, this
will not affet the accuracy or protection rating. When the display is fitted the lid has a clear glass
window fitted, scratch resistant and impact resistant to seven joules.
Weight:- Add 200 grams (0.44 lb) to instrument.
5
{ACCESS 2}
26
To perform the next two steps the use of a suitably calibrated DMM is required. The
loop current is monitored and entered into the transmitter, the unit then uses this as an
offset to calibrate its output. Because the process is iterative trim 4 mA and trim 20 mA
may have to be repeated if the error is excessive
L CAUTION Make sure that the loop is isolated or safe !!
{TRIMLOOP}[SELECT]{TRIM 4 mA}[SELECT]
This command will be rejected if FIXLOOP has not been set to 4.00 mA
An edit template is displayed, enter the reading from the DMM.
When change is pressed the first character starts to flash, change cycles the numerals
while select moves to the next character. When the last numeral is reached the whole
display flashes and you have two choices.
[SELECT] Aborts the edit and returns to {FIXLOOP}
[[SELECT]] Performs the [SAVE] function and resets the loop current.
The DMM should show the corrected reading.
{TRIMLOOP}[SELECT]{TRIM 20 mA}[SELECT]
This command will be rejected if FIXLOOP has not been set to 20.00 mA
An edit template is displayed, enter the reading from the DMM.
When change is pressed the first character starts to flash, change cycles the numerals while
select moves to the next character. When the last numeral is reached the whole display flashes
and you have two choices.
[SELECT] Aborts the edit and returns to {FIXLOOP}
[[SELECT]]
Performs the [SAVE] function and sets the loop current.
The DMM should show the corrected reading.
RFI Effect :-