TMDS Database

The TMDS database is available to operators with a high level password.  The database software can be installed on any computer.  This allows for convenient review of test results and setting of test parameters if the TMDS computer is networked to other computers.  The TMDS database software performs the following functions:  

Display and definition of individual motor information 

TMDS motor list.jpg (46857 bytes)
Sample Motor Information screen
Click to enlarge

The functions available on the Motor Information screen allow for the entry or review of the following information about a specific motor: 

Serial Number
Model
Commodity Number
Armature or Rotor Number

This information is stored in the database and serves two purposes.  First, the Model determines the test parameters which the motor is subjected to when tested.  Second, test results are stored under the Serial Number heading.  When the operator enters a serial number before a test begins, the computer finds the model of the motor and performs the test dictated by the information stored in the database under the Model heading.  Unique serial numbers should be assigned to each motor in order to keep track of individual motors. Every time a motor is tested the test results are stored in a file dedicated to that specific motor.  This allows easy monitoring of the motor's performance over its lifetime.

The Numeric Results and Graded Results buttons allow access to the test results of the motor defined in the Serial # box.  Refer to the next section for details regarding test results.

The Print List button will print a list of all motor serial numbers stored in the database.

Display of test results in both numeric and graded format

TMDS load results.jpg (90897 bytes)                          TMDS Graded test results.jpg (63953 bytes)
Sample
Numeric Test Results                             Sample Graded  Test screen
Click to enlarge                                                Click to enlarge

Display and definition of motor model information 

TMDS model numbers.jpg (57599 bytes)
Sample
Motor Model Information screen
Click to enlarge

The functions available on the Motor Model Information screen allow for the entry or review the following information about motor models: 

Model Number
Commodity Number
Manufacturer
Number of Armature Commutator bars (DC motor only)
Number of Bearing Rollers
Defaults standard

The name of the Default Standard determines which standard the computer will use when determining the grades the motor model will receive when analyzing the numeric test results.

When selected, the Test Parameters and Test Limits buttons will display the test parameters and test limits for the motor model.  Refer to the next two sections for details regarding test parameters and test limits.

Display and definition of test parameters and test limits for specific motor models

                                          
Sample Test Parameters    
                                                Sample Test Limits 

         Test parameters, which are instructions on how to test a motor, are stored under the Motor Model heading.  Therefore, any motors that are the same model are subjected to the same test parameters.  A complete list of test parameters is available since the the sample above only shows those parameters for a DC motor load tests.

         The test limits are maximum allowable levels which can exist during a test.  If any of the limits is exceeded, the test is terminated and the operator notified of the situation.

Display and definition of graduated standard  


TMDS Grad Stndrd.jpg (44190 bytes)                            TMDS Load Standard.jpg (55819 bytes) 
Sample Graduated Standard screens

A graduated standard is a set of instructions which defines how to interpret numeric test results.  Once a motor has been tested and the numeric results (voltages, currents, speeds, vibration, etc.) have been recorded, the computer will refer to the graduated standard for instructions on how to the grade the numeric results.  Over time, new standards can be implemented which reflect changes in test parameters or performance requirements.  

The graduated standard assigns a letter grade of A, B, C or F to different areas of a motor's test results.  For example, the armature current for a particular motor is 98 amps during the load test.  This is considered excellent so the motor will get a grade of A on armature current.  Another motor has an armature current of 127 amps during the load test.  This is considered poor so the motor gets a grade of F.  The graduated standard for armature current will be as follows:

Greater than 125 amps = F
125 amps to greater than 112 amps = C
112 amps to greater than 100 amps = B
100 amps or less = A

        The relationships described above are illustrated in the database as follows: 

A complete listing of the graduated standard is available since the sample screen only shows the standard for the load test. 

Motor Model Test Limits


Sample Motor Model Test Limits screen

The following parameters are those that are considered to be the maximum allowable operating condition for a specific motor model.  If the level of any parameter exceeds the defined limits, the test is terminated.  These limits are different from the Operational Limits in that they are specific to each motor model and, in general, of a lesser magnitude than the Operational Limits.  

    DC Motor
   
     Speed 
        Vibration
        Armature Current
        Field Current
        Temperature

   
AC Motor
        Speed 
        Vibration
        Current
        Temperature

Operational Limits  

The operational limits are intended to protect the TMDS itself in case of system or motor failure.  If any limit is exceeded, the test is terminated.  A typical list of Operational Limits is given below.

            AC output voltage 
            AC output current 
            Armature output voltage
            Armature output current 
            Field output voltage
   
         Field output current
            Vibration 
            Torque
   
         Input voltage imbalance
            Dynamometer water temperature
            Dynamometer water pressure

Test Configuration

TMDS Test Config.jpg (25374 bytes) 
Sample Test Configuration screen

This utility allows for the enabling or disabling of test segments.  If a test segment is disabled, it will not be performed during the test sequence.  For example, the system can be configured to only perform the load test.

Passwords

                    Two passwords are used for different levels of system access.  A low-level password, which should be issued to all personnel authorized to operate the TMDS, allows access to the Automatic Test function.  A high-level password allows access to all system functions.