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
Sample Motor Information
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 functions available on the Motor Information screen allow for the entry or review of the following information about a specific motor:
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.
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
Display and definition of motor model information
Motor Model Information
Model Information screen allow for the entry or review the following information about motor models:
The functions available on the Motor
Number of Armature Commutator bars (DC motor only)
Number of Bearing Rollers
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
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.
definition of graduated standard
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
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.
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
Dynamometer water temperature
Dynamometer water pressure
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.
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.