Aalborg DPM Series, Руководство по эксплуатации

Страница: 48 / 111

46
The OLED/joystick interface and digital communication interface commands are
provided to:
x
Enable/Disable Pulse Output
x
Start Pulse Output at a preset flow rate (0.0 - 100.0% FS)
x
Configure Unit/Pulse value (in current engineering units)
x
Configure Pulse Active On Time (50 - 6553 ms)
For example:
Maximum flow rate = 120 gr/min (120 gr/min = 2 gr/sec)
If unit per pulse is set to 120 gr per pulse, the Pulse Output will pulse once
every minute.
If unit per pulse is set to 2 gr per pulse, the Pulse Output will pulse once
every second.
The Pulse Output incorporates the pulse output queue, which accumulates
pulses if the Pulse Output is accumulating process flow faster than the pulse
output hardware can produce. The queue will allow the pulses to “catch up”
later if the flow rate decreases. A better practice is to slow down the Pulse
Output by increasing the value in the Unit/Pulse setting in the Pulse Output
menu (see
Figure 13 ).
6..4 4..113 G Ge en ne erra al S Se ettttiin ng gs s
6..4 4..113 3..1 S ST TP / N NT TP C Co on nd diittiio on ns s
Thhiis m meennuu sseelleeccttiioon aalllloows the uusseerr to sseet ddeessiirreed ssttaannddaarrdd tteem mppeerraattuurre aannd
pprreessssuurree coonnddiittiioonns oorr nnoorrm maall tteem mppeerraattuurre aannd pprreessssuurree ccoonnddiittiioonnss.
Foolllloow wiinngg ooppttiioonns aarre aavvaaiillaabblle iinn tthhiiss m meennuu sseelleeccttiioonn::
NOTE:
The Pulse Output minimum Active On time is 50 milliseconds
(0.05 second). The Pulse Output cannot operate faster than one pulse every 100
milliseconds(0.1second). A goodruletofollowistosettheUnit/Pulsevalue
equaltothemaximumflowinthesameunitspersecond.Thiswilllimitthe
pulse rate to no faster than one pulse every second.
NOTE:
If Pulse Output feature is required, the Solid State Relay
(SSR) output must be assigned to the “Pulse Output” function (see
Section 6.4.13.5). The Pulse output signal will be accessible via SSR
output (pins 1 and 2) on the DPM 8-pin MiniDIN connector (see
Figure 1 for proper wiring connections).