E-Tech DrivE-Tech 015 Installing And Operating Manual page 30

When performing sensor test operation,
SENSOR OFF alarm occurs
Frequency and pressure oscillation on
constant pressure control mode
DOL pump stops and starts continuously
Measured pressure drops too much
before DrivE-Tech starts the pump.
30
to wait at least 1 minute before restarting.

Check that the sensor cable is properly connected to the sensor device
and to the DrivE-Tech.

Make sure that the sensor and its cable are not damaged.

Check that the operating range of sensor is of 4 -20 mA type and the
value of 15 V is within the voltage feed range of the sensor.

Check if the water tank and its air pressure are correctly set. It may be
necessary to increase the tank volume or reduce the pre-charge
pressure.

Check the ki & kp parameters (Installer Parameters menu). At first, it is
suggestable to increase the Ki value. If it not enough reduce of one unit
the Kp value.

Increase delta control.

Check to see if the water tank and it's air pressure are correctly set. It
may be necessary to increase the tank volume or reduce the pre-charge
pressure.

Decrease the delta start value (Installer Parameters menu) .

Check to see if the water tank and it's air pressure are correctly set. It
may be necessary to increase the tank volume or reduce the pre-charge
pressure.

Modify the value of ki & kp parameters (Installer Parameters menu).
At first, it is suggestable to reduce the Ki value. If it is not enough
increase of one unit the Kp value.