Aquametrix 2200D Dissolved Oxygen Controller/Analyzer User Manual - Manual (Page 24)

Model 2200D/P91 Page 22
9.2 Escape
9.2.1
If the instrument appears to be "DEAD", for example not responding to the buttons,
or not performing on line measurement and control, always try the reset feature first,
as described in 6.3.1.
9.2.2 a) The "ESCAPE" procedure is to be used normally at the factory only, when the
unit is powered with a new MCU. As a result, the internal non-volatile memory
(EEPROM) is "FORMATTED" and the factory values are loaded into it.
b) The "ESCAPE" procedure is to be used if a unit is serviced for a new MCU
insertion, in case where the MCU was not calibrated at Water Analytics, or in
case of a memory loss problem, when so advised by Water Analytics service
support.
9.2.3 Before performing the "ESCAPE" procedure it is important to know that this
procedure provides the option to erase all programmed values and replace them
with the factory set default values. This is also true for the control setpoints and
deadbands, then alarm settings and the analog outputs scaling. Also, the
temperature and the D.O. calibration points will be set to their initial values. This
means, that the temperature and the D.O. calibration must be performed after an
“ESCAPE” procedure. After that, all the control, alarm and scaling parameters
mentioned above must be set to the user values.
9.2.4 To perform the ""ESCAPE"" proceed as follows.
a) Turn off the power.
b) Press and hold the RUN button for about 3 seconds, while turning on the power.
The FAIL LED will turn on (For Model 2200D-X-1 only) and STATUS LED will
become red (For Model 2200D-X-2 only) and status code 7 will be obtained to
show that the ESCAPE procedure was just performed.
9.2.5 After the "ESCAPE" procedure it is necessary to do the following:
a) Tune the analog outputs and the temperature output span to suit your particular
application and loop. See Sections 7.3, 7.4, and 7.5.
b) Calibrate the system, as described in Section 5.3.
c) Set up the user values for:
• Output High and Low - See Section 5.4. (For Model 2200D-X-2)
• Control Relay - See Sections 5.8 and 5.9.
• Alarm Relay - See Sections 5.12 and 5.13.
d) After all the above operations are performed the FAIL LED will turn off (For
Model 2200D-X-1) and STATUS LED will turn green (For Model 2200D-X-2)
and Status “0” should be obtained.
e) The unit may be tested now, using the TEST menu item (See Section
5.5), or the built-in self-testing feature, (See Section 9.1.4)
f) Bring the unit on line for measurement and control.
9.3 Printed Circuit Board Replacement
9.3.1 a) To replace printed circuit boards or relays shut off all power to the 2200D,
including any independent power to the relay contacts. Make a record of the
external wiring, then disconnect the wires. Unplug the ribbon cable connector.