YOKOGAWA RC400G, User Manual

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<5. Converter Operation>
5-27
IM 12F4A1-01E
(9) Setting Averaging Coefficient (time constant) (Function code "d")
The converter display and analog output are computed for average by the program. In this
setting, the extent of averaging (signal time constant) can be changed. Table 5.19 shows an
approximate correspondence between the averaging coefficient and a 90 % response time.
Table 5.19 Averaging Coefficient and 90 % Response Time
Averaging coefficient Standard for 90 % response time
1 Approx. 13 sec.
5 Approx. 37 sec.
10 Approx. 68 sec.
15 Approx. 101 sec.
20 Approx. 135 sec.
The 90 % response time is about (13 + (the averaging coefficient-1) x 6.35) seconds. This
coefficient is set at 1 (about 13 seconds for a 90 % response time) upon shipment from the
factory. If the fluctuation of measured readings is large, e.g., due to suspended matter in the
measurement object, change the averaging coefficient as necessary.
The following is the procedure for the setting operation.
(Example)
(a) Select function code "d" in the <PROGRAM. 1> mode. → 00001
(b) Select a digit using [>] key and set a numeric value using the [Λ] or [v] key.
→ 00005
(c) Press the [ENT] key to enter the value. → 00005
(Entire display once flashes.)
If the set value is beyond the permissible range, "not" is displayed. Reset the display by pressing
[>] key and set it again.
(10) Range Switching (“Remote/Local”) Selection (Function code “1.”, “2.”)
Analog output includes both “output range-1” and “output range-2”. Select which range is to be
output by specifying <remote> or <local>.
When <remote> is selected, the range to be output is determined by the contact input status (see
Figure 5.11).
F5.11.ai
R1 R2
Converter external wiring terminals
R1 R2
Converter external wiring terminals
Input contact “open” Output range-1 Input contact “closed” Output range-2
Figure 5.11 Relationship between Contact Input and Output Range in <remote> Range Switching
For <local> selection, select which is to be output “output range-1” or “output range-2” using
function code “2.” in the <PROGRAM.1> mode.
14th Edition : Jul. 15, 2020