Start-up
Adjusting the dosing capacity
24
© Lutz-Jesco GmbH 2017
BA-20710-02-V05
Chlorine control valve
C 7700
Operating instructions
11 Start-up
11.1 Vacuum system leak test
NOTE
Operating faults through leakages in the vacuum system
Small leaks in the vacuum system will not be recognised in normal
operation, since no chlorine escapes. Air will enter the system with
moisture. The moisture can combine with the chlorine to create
deposits and operating malfunctions.
With the injector switched off, there may be a slight chlorine smell.
ð
Check the vacuum system.
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Ensure that all action is taken only by personnel with sufficient and
corresponding qualifications.
The leak-tightness of the vacuum system is inspected together with the
vacuum regulator.
Precondition for action:
ü
The vacuum system is fully assembled.
ü
All the open connections of the vacuum system were closed.
ü
The injector is ready for operation.
Perform the following working steps:
1.
Interrupt the chlorine supply. To do so, either connect the tank valve
of a valve in the supply line to the vacuum regulator.
2.
Open the manual dosing valve on the dosing device.
3.
Lock the valve spindle of the electrical control valve in the open
position.
4.
Switch on the injector and wait until the vacuum meter in the system
displays a minimum of -0.5 bar.
5.
Switch off the injector.
6.
The vacuum must stay unchanged for at least five minutes.
7.
If the vacuum collapses quickly, eliminate the leak and repeat the
check on the vacuum system.
ü
Vacuum system checked.
11.2 Turning on the device
Precondition for action:
ü
The device is fully assembled.
ü
The leak test was performed.
Perform the following working steps:
1.
Switch the electrical regulation valve to manual operation (see
section 9.1).
2.
Switch the injector on.
3.
Open the chlorine supply.
4.
Set the dosing quantity on the manual dosing valve. Observe the
application process to prevent overdosing. Adapt the dosing quantity
is necessary.
5.
When the chlorine value corresponds approximately to the setpoint
during the application process, adjust the measurement amplifier
and the controller.
6.
Switch the electrical regulation valve to automatic operation (see
section 9.2).
ü
Device switched on.
Keep an eye on the dosing system during the first operating hours to
ensure proper functioning.
11.3 Adjusting the dosing capacity
If the dosing capacity of the regulation valve is significantly higher than
required, the capacity of the dosing system must be adjusted.
n
Program the PID controller more finely.
n
Adjust the regulation signal of the process.
n
Adjust the calibration of the servomotor.
The above listed measures are helpful when the regulation valve doses
up to twice the required amount. A smaller regulating element should be
fitted in case of stronger over-dimensioning. The working steps are the
same as described in section 13 „Maintenance“ on page 26.
