Endress+Hauser PROMAG 33, Руководство по эксплуатации

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Function group
BATCHING
Introduction
The “BATCHING” function group together with the preset totalizer enables simple batching cycles to
be controlled. The Promag 33 transmitter has two relays which can be used for controlling single or
two-stage batching cycles:
Entering a compensation quantity can compensate for plant-specific but constant errors in volume
e.g. caused by after-runs of pumps, closing time of valves, etc.
Note!
•
For short-cycle batching (filling time < 20 s)
→
see function “SELF CHECKING” (page 78)
•
If a system error (failure) occurs during a batching cycle or an empty pipe is detected (EPD)
the filling procedure is immediately stopped.
Starting / Stopping a Batching Cycle
The batching cycle can be started and stopped in four different ways:
•
via the HART interface or Rackbus 485
•
via the auxiliary input (with the “RS 485” communications module only)
•
via the function “BATCHING”
•
from the HOME position. Starting the batching cycle from the HOME position is always
possible if the “BATCH VARIABLE” function is set to “VOLUME” (see next page):
6
START – STOP – CANCEL
(
1
confirms the selection)
Note!
If a batching variable is activated, the “BATCHING” function group is first shown on the display when
entering the operating matrix. The function “BATCH QUANTITY” then moves into the first position within
this function group. This makes using the matrix much easier for the user. In addition all batching func-
tions can be changed without entering a code number.
Q
t
t
Q
Single-stage batching cycle
Relay 1 Relay 2
switch points
Batch quantity
After-run
Two-stage batching cycle (with pre-batch contact of relay 1)
Fine batching Coarse batching
Switch point
Relay 2
ba009
y
7
2 After-run
Note!
Note!
Promag 33 6 Description of Functions
Hauser 63