Blood pump stationary alarm during treatment

The Dialog+ EVO machines incorporated a new feature - Hall sensors. You will find them by the piston pumps (therefore the ball joint has two magnets), the blood pump roller with black arrows (on the back side you will see two magnets embedded into the plastic frame) and the blood pump motor (note that the blood pump motor connector has two extra wires when compared to the other motors (EP, FPE, FPA). Those two wires are a hall sensor output of the blood pump motor to tell the system of the pump motor is rotating.

In the Rev 1.02 Service Manual, check pages 37/38, the Basic Board. Connector P3 is where the BP Motor (BPA) connector plugs in. Just to the right, P48, is the socket for the Speed/Direction Rotation Arterial Blood Pump DZ/DR BPA. this connector is for those two extra BPA motor wires. Now since this just a Hall sensor output, it is basically a signal switching 0-1-0-1... to indicate speed/rotation (you need to see the starting point to determine direction) which equates to 0 volts/5 volts. So if all the wiring to this point is good and connectors fully seated, and the BP motor is working properly, the next step can be found on page 102. When you look at the left side of the DB diagram, you will find Controller/SUP Sensors (input). Notice that one of them is BPA_IMP. The next page describes it as Blood Pump Arterial Motor Hall Sensor (input). So if the motor is outputting a signal, and all wiring and connectors are good. the problem most likely is the Digital Board.

Be sure to let us know what you find.

<carl> How dusty/dirty is the machine? Not necessarily the DB but I would first check the Diabus cable between the motherboard and the BB. While gold plated pins don't 'corrode' because of the environment (dialysate), microscopic material gets on the pins and causes resistance, thus errors in communications. Reseat connectors and boards to "wipe" the contacts.