Axis Control Part 1

Training on the axis controls of the STA Compact, part 1: movements of arm number 1 and arm number 2. Part 2 can be found here.

Transcription of Axis Control Part 1 for the STA Compact

Welcome back to BiomedBuddy. This is a training film on the STA Compact manufactured by Diagnostica Stago. Today we are going to go over the Axis controls of this instrument. This is the movements of arm number one, which house needles numbers one, two, and three which are used for the transporting of samples and reagents, and arm number two which is responsible for picking up the cuvettes and delivering them to the incubation and measurement wells. As you see from the block diagram here, most of the signals come from the four-port serial board which we cover earlier in this training session. The direct signals that come from the four-port serial board go to the DC motor board and the 4-Axis board.

On to the DC Motorboard and the 4-Axis Board; In general the axis control consists of one four Axis board which control the X-Y movements of arms one and two. Arm one contains the pipetting head; arm two contains the suction head for the transporting of the cuvettes from the shuttle to the measurement block. One DC Motor Driver Board which controls the Z motors, meaning the up and down of needles one, two, three, and it controls the Z movement of arm two (up and down), four stepper motors, five zero Axis boards, one Multifunction Pipetting head board which is located on the pipetting head, one heating pipetting head board, which is again located on the pipetting head, one connection pipetting head board, again located on the pipetting head, four stepper motors, X, Y, and pipettor, four direct current motors with Z movements on needle one, needle two, needle three and the cuvette Arm Two motor. The pipetting head is fit with the three needles. The movements of the X and the Y are completed by means of belts and the return pulley. The suction head, which I’m referring to as Arm Two movement is made by a Y-belt and return pulley. All of the Z movements, the up and down, are controlled by DC motor control board. The general purpose of the suction is to pipette and dispense samples and reagents to the cuvettes and to move those cuvettes from the shuttle to the incubation, from the incubation to the measurement wells. It also controls the movement of the Pipettor, which is referred to in general as P1. Again, this movement controlled by two boards: four axis board, the stepper motors X, Y, and P, and a DC motor driver board for all Z movements. All of these movements are synchronized between the DC motor driver board and the Four Axis board.

Let’s take one board at a time, let’s start with the Four Axis board. The power supply for that starts with plus five volts, twelve volts and to twenty-eight volts, AC. On this board there are six LEDs. The first four are for axis movements, Y1, X1, P1, and Y2 Axis. The green one, which is D11 which means the forty volts power supply is okay, and the other green one which is D5 and it basically states that there is power going to that board. The Four Axis Board controls the Y movement for the suction head arm two, the movement of the Pipettor which is the P1 going up and down, the X movement of the pipetting head, the Y movement of the pipetting head. Again the pipetting head is Arm One which has the three needles. The voltage, forty volts is generated from the twenty-eight volts AC supplied to the four-axis board. Many signals are generated to this board from the input/output board. I will also tell you the four axis board generates a local five volts from that twenty-eight volt power supply.

Four-Axis Board: In general when you see it go bad, the motor just doesn’t turn. One of the common problems with that would be blown fuses and in reference to blown fuses, the easiest way to troubleshoot blown fuses is to pull out pretty much all of the boards and stick them into the instrument one at a time, to include the additional component board. I believe we will troubleshoot that, go through that scenario later in some of the troubleshooting.