YOKOGAWA RC400G, Руководство пользователя

Страница: 88 / 141

<5. Converter Operation>
5-35
IM 12F4A1-01E 14th Edition : Jul. 15, 2020
F5.14.ai
T1: Sand filter cylinder
T2: Measuring tank cleaning time
T3: Sand filter cylinder cleaning time
T4: Relaxation time
T5: Substitution time
T6: Cross time
T7: Measuring tank cleaning cycle
*1: Symbols in ( ) show the relevant external connection
terminal names.
*2: If the measuring tank cleaning function is in stopping
status. No operation is performed.
*3:
In the T7 period immediately after the mode is switched to
the <MEAS.> mode, cleaning operation is not performed. 。
Output
hold
T6
ON
OFF
Measuring
tank
cleaning
operation
*2
Sand
filter
cylinder
cleaning
operation
T6 T6 T5 T6 T6 T5
2 sec 5 sec T5
ON
2 sec 5 sec T5
ON
2 sec 5 sec
ON
2 sec 5 sec
ON
T2
ON
T2
ON
T7 * 3 T7 T7
T4
ON
T4
ON
Output
hold
Output
hold
OFF
OFF
OFF
OFF
OFF
T1 T1 T1 T1 T1
SV2
(WASH)
*1
Switched to
<MEAS>
SV3
(LINE 1)
*1
SV4
(LINE 2)
*1
SV5
(FILTER 2)
*1
SV1
(FILTER 1)
*1
T3 T3
T3
T3
Figure 5.14 Cleaning Sequence Time Chart for Sand Filter “Two-Cylinder Type”
In the sand filter “two-cylinder type” cleaning sequence, the sand filter cylinder cleaning
sequence and the measuring tank cleaning sequence operate independently.
A cleaning sequence starts at the time when mode is switched to <MEAS.>. When the measuring
tank cleaning starts, the analog output holds at the value immediately before cleaning start. Hold
is reset when the relaxation time is completed. During analog output hold, <HOLD> lamp lights.
During cleaning, <WASH> lamp flashes. In response to operations of solenoid valves, operation
display lamps corresponding to each solenoid valve “light/extinguish”.
Table 5.21 shows permissible time setting ranges applied to each cleaning sequence operation
shown in Figure 5.14.
Table 5.21 Cleaning Sequence and TIme Setting for Sand Filter "Two Cylinder Type"
Time Chart
Symbol
Function
Code
Content
Permissible
Setting Range
Setpoint Value
on Shipment
T1 6 Sand filter cylinder 0.1 to 24.0 hours 0.5 hours
T2 4 Measuring tank cleaning time 0.1 to 25.0 min 1.0 min
T3 7 Sand filter cylinder cleaning time 0.1 to 25.0 min 1.0 min
T4 5 Relaxation time after cleaning 0.1 to 25.0 min 3.0 min
T5 8 Substitution time *1 0.1 to 25.0 min 6.0 min
T6 9 Cross time *2 0.1 to 25.0 min 1.0 min
T7 3 Measuring tank cleaning cycle 0.1 to 24.0 hours 1.0 hours
*1: Substitution time is the time for stabilizing water in the sand filter
*2: Cross time is the time that overlaps when the sample water line is switched.