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HA20 2-Channel Controller
The flow chart in Figure 2-7 illustrates the above procedure. up arrow,
CAL, Next & Edit labels indicate keystrokes (down arrow/CAL is a dual
purpose key). The CAL MODE information screen (top of the chart) is
available for advanced users to see Offset / Gain calibration constants
and live analog to digital converter (A/D) counts. Span Gas calibration
values may also be edited from this screen. Holding the up arrow key
for 5 seconds during CAL MODE displays this screen.
Unity Gain may be used at anytime to cancel incorrect calibrations
and start again.
Figure 2-7. Cal Mode Flow Chart
HA20 Technical Manual
2.3 System Configuration Menus
Several items needing configuration are not specific to either channel
but affect the entire system. These are located in the system tree
entry menu shown on the left side of Figure 2-1. System menus
are accessed by pointing to the desired item and pressing Edit. The
Diagnostics menu group (\) is useful for testing relay and analog I/O
without stimulating the input.
Figure 2-8. System Configuration Menu
2.3.1 Relay 1 / Relay 2 Menus
The Relay 1 & Relay 2 menus are identical except Relay 2 has an
acknowledge feature that is useful if it controls an audible device.
All other Relay 1 & Relay 2 features are identical and therefore are
discussed only once.
Figure 2-9. Relay Menus
• The Set Relay Logic menu shown below in Figure 2-10 offers
additional "voting" flexibility by controlling the channel alarm
combinations that will trip this common alarm relay. "OVR" on
the menu's right side stands for override and means ANY of the
selected alarms will activate the relay. The "OR" / "AND" columns
work together based upon the following logic equation:
2-7
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