ECM NH3 5250, Инструкция по эксплуатации, Страница: 16 / 62

12
Front Panel and the “SYS” Key
The NH
3
5250 display head can be thought of as two single-channel display heads in one
package. One NH
3
module can be assigned (via the Mod Setup Option ) to the upper
display, upper four leds, and analog outputs 1, 2, 3 (i.e. the upper channel) and a second NH
3
module can be assigned to the lower display, lower four leds, and analog outputs 4, 5, 6 (i.e.
the lower channel). Or one NH
3
module can be assigned to both channels. If no module is
assigned to a channel, “….” appears on that channel’s display. More than two NH
3
modules
can exist on the EIB but a given display head can only show data from two of them. Adding
another display head to the EIB will allow data from another two NH
3
modules to be
displayed.
The display head has two modes of operation: RUN (when measurements or error codes are
displayed) and SYS (where the instrument is set-up). The SYS key toggles between the
modes.
When in RUN mode, the parameter being displayed is indicated by leds to the right of the
display. There are four leds for each display and each led can be red or green. One
parameter (NH
3
) is fixed and seven (P1 to P7 or P8 to P14) are programmable from the list of
parameters in Table 2. The

and

keys select which of the eight parameters are displayed
(unless the display is LOCKed, see below).
While in RUN mode, pressing the ENT key will toggle between the

and

keys changing
parameters on one channel’s display to changing parameters on the other channel’s display.
In RUN mode, four things other than data can be displayed:
1. “ERR” and “####” where “####” is an error code. See Appendix C .
2. “….” which means that a NH
3
module has not been assigned to that channel.
See MOd Setup Option .
3. “----“ which means that the display head has an internal problem.
4. “XXXX” which means that the display is not receiving any data.
5. “Rotating wheels” and sensor countdowns.
When first entering SYS mode, either “MOd” will be on the upper display or “LOCK” will
be on the lower display. If “MOd” is displayed, the

and

keys will roll through the setup
options (see Table 1). First the options for the upper channel are shown on the upper display,
followed by identical options for the lower channel on the lower display, ending with the
global CONF (Configuration) setup. Pressing the ENT key will select the displayed setup
option and allow its programming.
If “LOCK” is displayed, the display head has been locked and neither the parameters
displayed nor the instrument setup can be changed until it is unlocked. Appendix D
describes how to LOCK and unLOCK the display head.