YOKOGAWA EXA DO402G, User Manual

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<5. Parameter setting>
5-22
IM 12J05D02-01E
DO
Wash Recovery
Interval Time
Time
t
w
t
r
Figure 3 Dynamic response during wash
5.3.6 User interface
Code 50 *RET When Auto return is enabled, the converter reverts to the measuring
mode from anywhere in the configuration menus, when no button is
pressed during the set time interval of 10 minutes.
Code 51 *MODE The adjustment of the contact setpoints, and the manual operation of
the wash system can be setup for operation in the maintenance mode.
(Through the closed front cover). In maintenance mode the pressure
can be entered (M. PRESS). If manual pressure is enabled, a warning is
given when starting manual-, water and air calibration.
Code 52 *PASS Passcodes can be set on any or all of the access levels, to restrict access
to the instrument configuration.
Code 53 *Err.04 Error message configuration. Two different types of failure mode can be
set.
Hard fail gives a steady FAIL flag in the display, and a continuous contact
closure. All the other contacts (controls) are inhibited (except HOLD
contacts), and a Fail signal is transmitted on the outputs when enabled in
code 32.
Soft fail gives a flashing FAIL flag in the display, and the relay contacts are
pulsed. The other contacts (controls) are still functional, and the controller
continues to work normally. The call for maintenance is a good example
of where a SOFT fail is useful. A warning that the regular maintenance is
due, should not be used to shut down the whole measurement. An extra
choice is added for Errors set to Soft Fail. It can be set to LCD + Fail
contact (current situation) or to LCD only.
Code 54 *E12 Overrange alarm, set limit for supersaturation permissible before FAIL
alarm is triggered.
Code 55 *CALL.M Call for maintenance is a contact trigger to signal that the system has
been in service for longer than the set time without calibration. The user
can set up to 250 days as a routine service interval.
Code 56 *UNIT Select mg/L, ppm or % saturation as the main unit, to suit the application.
9th Edition: Aug. 05, 2015-00