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HA40 4-Channel Controller
2.3.4 Analog Setup Menu
The system ANALOG SETUP menu allows setting the 12-bit A/D
(analog to digital) counts and the 10-bit D/A (digital to analog) counts
for each of the four channels. The live A/D counts value for the channel
selected is also shown on the bottom of this screen.
The default setting for A/D counts is 800 for Min and 4000 for Max.
This is based upon a 0-20mA input providing 0-4000 counts, or, 200
counts per mA input.
• A/D Min / Max Raw counts menu entries define the input counts
value that cause Zero and Span readings as described in
Measurement
Range. The default settings for each channel
are 800 to 4000 counts because the HA40 4-20mA input PCB
has a 12-bit analog to digital converter that yields 200 counts
per milliamp input. Standard 4-20mA inputs yield 800 counts at
4mA and 4000 counts at 20mA. However, if a special application
required the Zero reading at 6mA input and the Span reading
at 18mA input the correct A/D Min / Max Raw counts menu
entries would become 1200 to 3600.00.
• D/A Min / Max Raw counts menu options define the optional
(future) 4-20mA output PCB's input. Ideally, 200 to 1000 yields
a 4-20mA output but very slight modifications may be needed
to provide precise 4mA and 20mA values for each channel.
Figure 2-11. Analog Setup Menu
HA40 Technical Manual
2.3.5 Horn / Acknowledge Menu
J2 on the motherboard (shown in
the optional 100dB piezo. Fault, Alarm1, Alarm 2, & Alarm 3 menu
options (shown in Figure 2-12) allow programming of which alarms
affect this piezo and whether by pulse or steady tones. The HA40
display PCB is also equipped with a small audible piezo that chirps
when keys are pressed, providing an audible feedback to the operator.
It also may be set to audibly indicate alarm conditions by entering ON
into the Local Piezo menu item in Figure 2-12. This piezo will then
mimic the optional 100dB horn.
Input
The Relay 2 ACK menu item determines if standard relay 2 may be
acknowledged by an Alarm Reset. ON causes an Alarm Reset to
silence the horn even though an alarm condition remains active.
Figure 2-12. Horn/Acknowledge Menu
2-9
Figure 3.2)
is the driver output for
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