MedDrawer Test Procedure
MedDrawer Test Procedure
Reference Stinger part numbers: 8116393 Rev 1.3 March 2008 Control PCB
8116393 Rev 1.3 March 2008 Modified Control PCB
8116393 Rev 2.0 Control PCB
8116397 Rev 1.3 Relay PCB
8116397 Rev 2.0 Relay PCB
Reference Firmware Revisions
8116393 Rev 1.3 Not Modified
Full Medication: Rev 3.24
Single Narc Drawer: Rev 3.28
Motor Up_Down Only: Rev 3.27
8116393 Rev 1.3 Modified
Full Medication: Rev 3.26
Single Narc Drawer: Rev 3.28
Motor Up_Down Only: Rev 3.27
8116393 Rev 2.0
Full Medication: Rev 3.32
Single Narc Drawer: Rev 3.33
Motor Up_Down Only: Rev 3.34
Theory of operation
The MedCart control PCB primary function is to:
1. Process the keypad closures.
2. Lock and unlock the Med drawers.
3. Monitor the cassette open and close drawer status.
4. Monitor the Narcotic open and close drawer status.
5. Pass the raise and lower commands from the keypad to the pole motor.
6. Display the Mobius battery remaining time and countdown time when the battery is removed.
7. Sound the beeper when commanded by the Main Controller pcb.
The MedCart control PCB has two Microchip processors to perform these functions. The PIC16F886 U1 handles the lcd display and beeper commands. The second Microchip processors PIC 18F4550 U10 handle the remaining operation. This processor also communicates with the Main controller pcb located in the base of the Medcart. Should the U10 processor fail to receive communication from the Main controller pcb it will become a stand alone system requesting Pin Number information from the user. Whenever a user press the keypad buttons the U10 processor will decode the key pressed and passes the information to U1 for display and sounds the beeper.
The pole is moved up or down whenever the operator presses the UP or Down buttons. Microprocessor U10 will directly control the movement by operating the K1 or K2 relays mounted on MedDrawer Keypad Connector board. The power from the battery passes through J1 and the K1 or K2 relay contacts directly to the pole motor via P28. Limit switches mounted inside the pole motor limit the travel of the pole.
The med drawer unlock solenoid will operate after a user enter the correct password. The U10 processor will start a countdown timer to operate the lock solenoid. A 250 millisecond pulse will be sent to the lock or unlock solenoids. Fet Q3 operates the unlock solenoid and Fet Q4 operates the lock solenoid via the P16 connector. Neither Q3 nor Q4 will have 12 voltage continuously on it outputs. If this should occur then the Solenoid will be damaged. The status of the position of the solenoid is sent to U10 via the P13 connector mounted on the Keypad connector board. The status of the Cassette drawer is returned via P12. The drawer closed switches are connected in series and returned to U10 via the ribbon cable. Jumpers or status switches must be installed in all the locations
(P1 –P10) for the system to operate correctly.
A single Narc drawer is operated by a relay via the P17 or P18 connectors. This relay is operated with a continous12 volts applied to unlock the drawer. An internal spring returns the relay to the lock position when the power is removed.
The main controller pcb mounted in the base of the cart communicates with the U10 processor. System messages are sent to the board for display and to sound the beeper. Communication failure with the main system board will make the med drawer board go into a standalone mode with the display asking for a Pin number. Lock and unlock commands will be processed during this time.
Trouble shooting the Medcart
1. Verify the Solenoids are not defective by measuring the coil resistance. The resistance must be around 4 ohms. Any resistance below 3 ohms indicates the coil is defective. Plugging in a solenoid into P16 with low resistance will damage the cables, connector pcb and control pcb.
2. Verify that the solenoid status cable is plugged into P13. If this cable is bad or plugged into the wrong location the system will produce “Unable to Lock messages”
3. With a voltmeter measure the voltage on connector side of Q3 and Q4. It should be around 0 volts. If the voltage is 12 volts then the fet is bad or the wrong software is installed. The resistance across the FET should be a very high value. A low resistance value means the FET is bad. Verify there is 12 volts on the opposite side of the FET. This is normal. If 12 volts is not present check the ribbon cable and the J1 cable mounted on the connector pcb.
4. With a voltmeter measure the voltage on connector side of Q3 or Q4 after a proper Pin number has been entered. You should see the voltage increase momentarily on the meter when the 250millisecond pulse is sent to the relay. No voltage increase means the board is bad. The pulse to lock the drawer will occur whenever you press the LOCK pushbutton. Failure to see this increase in voltage is a good indication the board is bad or the keypad cable is not installed correctly. If the voltage does occur in the correct sequence then the locking mechanism may be preventing the solenoid from operating. A damaged ribbon cable or solenoid cable will produce the same effect. Adjusting the solenoid arms will fix an intermittent locking problem.
5. Failure to plug the keypad cable into J3 properly will cause the unit Not to indicate a “*” when a button is pressed. Also pressing the Lock button will not produce a lock signal. Remove and reinstall this cable will usually fix the problem.
6. Failure of the pole motor to operate first check the dipswitch positions on the connector board, 1 and 2 must be down. Check the voltage on P28 pins 1 and 2. You should measure 12 volts when the down button is pushed. Check the voltage on P28 pins 3 and 4. You should measure 12 volts when the up button is pushed. Fail to measure the correct voltage means the K1 or K2 relays may be bad, a bad ribbon cable, or defective control board. Verify the voltage on the connector board TP5. There must be 12volts on this test point. Failure to measure this voltage means the J1 connector is defective.
7. 8116397 Rev 1.3 must be replaced with the new 8116397 Rev 2. with D13 and D14 diodes to protect the lock and unlock Fets from damage when the solenoid is turned off. Failure to replace this board will cause the Fets to fail in a short condition. Damage to the solenoids, wiring and boards will occur.
8. 8116393 Rev 1.3 Not Modified PCB must be change with a 8116393 Rev 1.3 Modified pcb or a 8116393 Rev 2.0 to insure the solenoid will lock or unlock correctly.
9. If there is a communication problem of the Medcart controller board with the system. Check the resistances on the P14 cable pins 2 and 3 to ground pin 1. It should be about 5K. A resistance below this 5k means a problem with the one of the boards on the I2C bus. You have to make this measurement when the system is not powered.
[pic]
[pic][pic]
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Latest Connector PCB with Diodes
MedDrawer Control Board Update Notification
Stinger PN:
8116394 REV 3
Firmware Revision:
MedDrawer Control
- Full Medication: REV 3.32
- Single Narc Drawer: REV 3.33
- Motor Up-Down Only: REV 3.34
MedDrawer LCD – REV 2.03
Note:
Firmware revisions listed above are only to be used on boards with ‘PCB PN: 8116393 REV 2’ etched onto it. Please see the picture below for PCB part number location. All previous board revisions will use their specified firmware versions according to their medication cart configuration.
[pic]
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