Rate-Of-Change Limit And Control Limit Time - Toshiba LF620 Instruction Manual

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8.2.11 Rate-Of-Change Limit and Control Limit Time

The rate-of-change limit is used to control sudden changes of the converter's flow rate signal output
when excessive noise is contained in the flow rate signal.
The rate-of-change limit (set in percent value to the span of measuring range) and control limit time (set
in second) are used, and if the flow rate signal sampling value exceeds the rate-of-change limit value
based on the previous average value of the flow rate signal, the converter rejects the sampling value and
outputs the average value including the maximum value of the rate-of-change value.
In addition, if the limit-exceeding flow rate sampling value continues for the same flow direction for
more than the preset control limit time, the data will be considered as flow rate variation and that
sampling value will be used as normal output data.
You can set these two parameters within the ranges shown below:
• Rate-of-change limit
• Control limit time:
Note：If "0" is set in either of these parameters, the rate-of-change limit function is disabled.
Display example
DAMPING
The switches at the bottom change.
(
02.0
At the same time, the cursor appears.
S
DAMPING
Push
desired digit and push
10.0
number of the digit.
S
DAMPING
When you push
to confirm whether the setting is OK or not.
10.0
If OK, push
setting, push
S
SET OK?
Pushing
and exits the setting screen.
O K
ESC N O
0 to 30% / 50ms (in increments of 0.1%)
0 to 20s (in increments of 1s)
− 73 −
6 F 8 A 0 9 2 7
Description
are shown.)
to move the cursor to the
to change the
, a message appears
. If you want to redo the
O K
.
N O
cancels the setting operation
ESC