9
Level / Pump control
The control box (12) is installed if the optional level sensor was added. The
programmable LED display will show the tank level as a percentage of the sensor
scale. The LED display is used to control the unit start/stop. The will also stop the
distribution pump from running dry when tank level is too low or signal is outside
normal range.
There are 4 relays that control those functions. Relay 1 and 2 control the unit and
relay 3&4 the pump. Relay 1 is set to 95% and will stop the HOCl
production when reached. Relay 2 will start HOCl production when level goes below 50%. Relay 3 will stop the
pump from running when level goes below 10%. Relay 4 will stop pump when level shows 101.5% which is outside
normal operation.
The relay settings can be changed by the operator. Press the up or down arrow on the display when default screen
is displayed to access “fast set-point”. Press up/down arrow to choose the wanted relay to change. Press the “ok”
button to access the desired relay set-point. Relay 2 setpoint should always be lower than relay 1 setpoint.
Pressing the “ok” button when default screen is display will prompt you for a password. Enter the password to
change setup of the programmable LED unit.
Ultrasonic level sensor
The ultrasonic level sensor (14) connects to the control cox. The M12 connector used for
the sensor can only be installed in one position, make sure the M12 connector is connect
straight and all the way (do not use any tools). The ultrasonic level sensor is mounted to
the HOCl storage tank, in a way that leaves a free line of sight to the measured liquid.
The sensor has a dead band of 300 mm, meaning that the sensor has to be minimum
300 mm from the measured liquid. Maximum range of the default sensor is 3 meters.
The sensors signal strength is indicated on top of the sensor using a red LED. Make sure the red LED is on for the
sensor to work correctly.
Distribution pump
The optional distribution pump is a constant pressure pump that uses a build in VFD. The pump uses a pressure
sensor to measure the pumps output pressure. The pump speed is adjusted to maintain the correct pressure.
The pump connects to the Backboard control box with two cables. Cable 1 supply the needed power (Vac). The
second cable is used for pump protection in specific situations.
The pump starts on its own when the pressure in the outlet line drops. The pump stops again when the pressure in
the output line is higher than the setpoint. The pump pressure can be adjusted on the pump by pressing the arrows
on the top. The storage tank is connected to the pump inlet and all consumers connect to the output.
Picture 18 Control box
Picture 19 Level sensor
Relay number
Description
Setting %
1
S
ystem is stopped at this setting
95
2
S
ystem is started at this setting
50
3
Pump is stopped, to avoid running dry
10
4
Pump is stopped as level signal is outside normal range
101.5
