Pentax IPFC 109, Operating Manual

Page: 37 / 216

37
9. Trouble-shooting chart
LCD does not switch on after powering
the IPFC

Check the connecting flat cable between the LCD board (attached to
the cover) and the control board

Check the fuses

Check that the power cables are properly connected.
Power line of IPFC is interrupted by the
differential protection contactor

Check the leakage current to ground of EMC filter

Following a rapid off/on the power supply, the differential contactor
can interrupt the power. After turning off the IPFC it is recommended
to wait at least 1 minute before restarting.
When performing sensor test
operation, SENSOR OFF alarm occurs

Check that the sensor cable is properly connected to the sensor device
and to the IPFC.

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.
Frequency and pressure oscillation on
constant pressure control mode

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 (Control parameters menu). At first, it is
suggestable to increase the Ki value. If it not enough reduce of one unit
the Kp value.
DOL pump stops and starts
continuously

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.
Measured pressure drops too much
before IPFC starts the pump.

Decrease the delta start value (Control 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 (Control Parameters menu).
At first, it is suggestable to reduce the Ki value. If it is not enough
increase of one unit the Kp value.