Emerson Rosemount 3490 Series, Справочное руководство

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Note
If Pump 1 keeps the level below 8 m, it would stay switched on until the level is 2 m.
Related information
Relay safeguard options
Totalizer mode relay
Menu
SETUP
→
[CONTROLLER]
→
OUTPUT
→
TOTALIZER
A Totalizer relay can output a pulse for each time that the internal totalizer count (D828)
increments. The duration of the pulse may set using parameter P534.
Note
If the totalizer count is running faster than the relay can produce pulses, an internal
accumulator stores the excess pulses. The stored excess pulses are output by the Totalizer
relay after the totalizer count rate reduces.
Table 4-12: Totalizer Mode Relay Parameter
Parameter Description Factory default
P534 Pulse Width The duration controls both the 'On' time and the 'Off'
time - i.e. the pulse width - and may be set to a value
between 10 ms and 2.5 seconds in steps of 10 ms. 100
Sampler mode relay
Menu SETUP → [CONTROLLER] → OUTPUT → TOTALIZER
Sampler relays output pulses at a slower rate than a Totalizer relay. The Sampler relay can
be used as a coarse totalizer or as a trigger to an external event.
Table 4-13: Sampler Mode Relay Parameter
Parameter Description Factory default
P535 Sampler Factor This is for defining the frequency of the Sampler
pulse. For example, a value of 100 means that the
Sampler relay outputs a single pulse for every 100
th
increment to the Totalizer Count (D828/D829)
The pulse width is the same as selected for the
Totalizer relay (P534)
0
Related information
Set-up totalizing
Reference Manual Getting started
00809-0100-4841 January 2021
Emerson.com/Rosemount 109