Syringe Did Not Reach/Leave Up Position Errors 12 and 13, AC?T 8/10 and AC?T diff Analyzers
The syringe assembly only uses one sensor and it is at the top position. At various times, the
syringe is homed, sent to the top position. When the syringe is not detected at the home
position after it is sent there, a Syringe Did Not Reach Up Position (error 12) message is
generated.
Syringe movement is complex as many up/down movements can occur before the syringe is
sent back to the home position. It is not practical to track this movement and determine
exactly when the syringe should be back at the home position. Instead, the syringe is sent to
the home sensor after a period of activity to start once again from a known position. Though
movement is not tracked precisely, the syringe should never be at the home sensor after a
downward move. If this is detected, a Syringe Did Not Leave Up Position (error 13) message
is generated.
Mechanical and hydraulic problems that can produce error 12 or 13 include:
r A problem with the motor and lead screw of the syringe mechanism
r Dislodged syringe pistons
r A damaged, obstructed, or out of position syringe sensor
r Deteriorating piston seals that result in too much friction
r Broken syringe bodies
r Plugs in hydraulic tubing or solenoid valves that cause syringe deadheading.
Electrical problems that can produce error 12 or 13 include:
r A defective syringe motor or sensor
r A defective solenoid valve that causes a deadhead pathway
r Poor electrical connections to a solenoid, syringe motor, or sensor
r A problem with the Analyzer card which drives the solenoids, motors, and sensors
r Problems with the Power Supply module, since the DVM check is made only during
powerup. This is especially true on the AC?T 8/10 analyzer, since the DVM does not
check the +24 Vdc supply. |
