Honeywell ALERTON ACM-VLX Installation And Operation Manual page 56

Installation and Operations Guide
56
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ACM-VLX/VLX/EXP/AXM
Because of the nature of the filtering equation, higher filter values (close
Note
to 255) result in a slower response to input changes. The most effective range is
240 or 255.
Only IN-1, IN-2, and IN-3 can be set up as pulse
Setting up pulse inputs
inputs by setting the input type AV to 4 (Pulse). When the input type AV is set to
4 (Pulse), corresponding Time Base and Pulse Value AVs must be set:
AV-e4nn = Time Base
AV-e5nn = Pulse Value
Time Base Set to the number of seconds in the rate units for the
substance measured. For example, if the pulse device
measures gallons per minute, set Time Base to 60 (60
seconds in a minute). If the device measures gallons per
hour, set Time Base to 3600 (3600 seconds in an hour).
Pulse Value Set to the number of units that a single pulse represents. For
example, if each pulse from a pulse meter represents 0.1
gallon, set Pulse Value to 0.1.
After the pulse input is set up, AI-e0nn provides rate and AV-e019+nn provides
consumption (for example, AV-e21 provides consumption for IN-2).
The pulse-width range is 10 ms to 327 seconds. Pulse width is measured from
successive rising edges of consecutive pulses (see Figure 22 on page 39).
Setting backup mode values for AOs and BOs
If an EXP/AXM loses communication with its VLX/ACM-VLX, it enters a
backup mode. See "Backup mode sequence of operation" on page 66 for details
about backup mode conditions.
Backup mode values are battery backed and are retained through
CAUTION
power outages. However, if both 24 VAC and coin-cell battery power are lost,
these values must be restored to the VLX/ACM-VLX. Save point data to the
Compass operator workstation.
Set the present-value of AVs in Table 12 according to the command you want
applied for the corresponding AO or BO in backup mode. For BOs, set the AV to
0 if you want the BO to be OFF in backup mode, set the AV to 1 to be ON.
Do Not write to Backup Mode AVs with DDC. See the Technical
CAUTION
Issue KBA "Writing to EXP backup mode AVs in DDC causes EXP
communication failures and resets" on the Alerton Support Network for more
information. Doc ID: 01-0117-01-00
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