YOKOGAWA RC400G, Руководство пользователя

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<5. Converter Operation>
5-33
IM 12F4A1-01E
(1) Cleaning Sequence and Time Setting for Sand Filter “One Cylinder
Type” (Function code “4”, “5”, “6”, and “7”)
Figure 5.13 shows the cleaning sequence for sand filter “one cylinder type” applied to the
RC400G-2 residual chlorine analyzers for raw water.
F5.13.ai
SV2(WASH) *3
SV1(FILTER 1) *3
Output hold
T1 *4
T2
ON
T2
ON
OFF OFF
OFF
ON
T4
5 sec T3
ON
2 sec
OFF
ON
T4
OFF
ON
Hold time *2
OFF
OFF
OFF
OFF
ON
T4
T3
ON
ON
T4
OFF
ON
5 sec 2 sec
T1 *4 T1
Measuring tank
cleaning
operation *1
Sand filter
cylinder cleaning
operation
Hold time *2
T1: Sand filter cylinder and measuring
tank cleaning cycle (residual chlorine
concentration measuring time)
T2: Measuring tank cleaning time
T3: Sand filter cylinder cleaning time
T4: Relaxation time
*1: If the measuring tank cleaning function is in stop status. No
operation is performed.
*2: The hold time is the following time whichever is longer;
(T2 + T4) or (T3 + T4 + 7 sec)
*3: Symbols in ( ) show the relevant external connection
terminal names.
*4: This is set function code “6”. This is relevant to sand
filter cylinder cleaning cycle (cleaning waiting time).
In the T1 period immediately after the mode is switched to
the <MEAS.> mode, cleaning operation is not performed.
Figure 5.13 Cleaning Sequence for Sand Filter “One-Cylinder Type”
The cleaning sequence starts at the instant when the mode is switched to <MEAS.>.
When cleaning is started, the analog output holds at the value immediately before the cleaning
start. Hold is reset at the relaxation time completion.
During the analog signal holds, <HOLD> lamp lights.
During cleaning, <WASH> lamp flashes. In response to operations of solenoid valves SV1 and
SV2 shown in Figure 5.13, operation display lamps corresponding to each solenoid valve “light/
extinguish”.
Table 5.20 shows permissible time setting ranges applied to each cleaning sequence operation
shown in Figure 5.13.
14th Edition : Jul. 15, 2020