Troubleshooting
29
© Lutz-Jesco GmbH 2017
Subject to technical changes.
170518
BA-20710-02-V05
Chlorine control valve
C 7700
Operating instructions
14 Troubleshooting
All possible errors are listed in this table.
Problem
Possible cause
Remedy
The system does not achieve its full
dosing capacity.
The manual valve on the flow meter is not
completely open.
Open valve.
Not enough chlorine tanks are connected or some
are empty.
Connect more chlorine tanks. Replace empty tanks.
Injector suction is insufficient.
Increase injector suction capacity:
n
Increase motive water pressure.
n
Lower injector back pressure.
n
Fit more powerful injector.
The slot of the slotted nozzle is dirty.
Clean slotted nozzle.
The adjusting spindle in the valve is not adjusted
properly.
Adjust the adjusting spindle (see section 13.4.4).
Check if the hexagon nut is tightened against the
guide bolt.
The regulation bevel of the servomotor has been
limited.
Set the regulation bevel to the maximum regulation
bevel of 90°.
The dosing capacity of the valve is too
small/large for the consumption
process.
The selected valve is too small/large.
The valve spindle can be replaced if the dosing
capacity is 2500 g/h or smaller. All other parts
remain the same. From 4 kg/h upwards, all valve
discs and valve seats must be replaced together.
Another housing might be required.
The valve does not respond correctly.
The potentiometer of the 3-point step servomotor is
not connected properly.
Make sure that the potentiometer scraper on the
controller has been connected as a scraper.
The signals do not match.
Check if the controller and valve both work at
4-20 mA.
The potentiometer reaches the mechanical limit in
an end position.
Adjust the potentiometer including the slip coupling
in such way that the mechanical limit is not
reached.
The voltage supply has been interrupted. All LEDs
are off.
Re-connect the voltage supply.
The valve does not close completely.
The adjusting nozzle might allow a very small
quantity to keep flowing, even at 0% control.
C 7700 is a regulation valve, not a shutoff valve.
If you want to shut off completely, fit a shutoff valve.
Table 27: Troubleshooting
