Motor working condition simulation test and result analysis
With the improvement of the maturity of modern industrial automation, engineers tend to simulate the actual working condition cycle of the motor, and complete the automatic test of temperature, power and other parameters through the setting of the instrument. This paper presents the simulation test and results of the motor working condition according to the actual arrangement. analysis.
The motor industry needs to test the temperature change of the motor during operation, such as the temperature can not exceed certain limits; also need to test the motor voltage, current, power, etc., and all parameters need to be displayed at the same time for easy viewing and control. Of course, a comprehensive test system for motor characteristics can fulfill this test requirement, but the cost is too high, and the accuracy requirements of many test cases need not be so complicated.
If the electrical parameters and temperature performance are only comprehensively evaluated, the DM100 data acquisition recorder can be used with the PA310 power meter to meet the test requirements. It can realize the automatic control of the motor test and display all the information in the PC software at the same time. Focus on the automatic control link.
1.1 Simulation test description
The actual working condition of the motor is generally a fixed sequence of running and stopping cycles. How is this working state realized? The usual practice is to arrange for the engineer to manually switch the switch. This method is not able to accurately grasp the time, and the second is time-consuming and labor-intensive. In fact, as long as the digital output module of the data acquisition recorder can complete the cycle of the working cycle of the motor, it is accurate, time-saving and labor-saving.
1.2 Simulation of actual working conditions of the motor
1, hardware and connection requirements
The DM90YD digital output module can be used as a relay output (C contact) when an alarm occurs or can be output (ON/OFF) by manual operation of the touch screen.
DO output control: Select the excitation mode, connect COM and NC to the input terminal of the external relay and the external mains respectively, and the output of the external relay is connected to the power supply and the motor.
Large motor test current requires relay to be converted into digital acquisition DO module can carry current, it is AC control AC type, input control voltage is 80~280VAC, control current is less than 30mA, load voltage is 24~480VAC, load current is up to 20A.
2, computing channel settings
The operation channel A001 selects ON, and the operation expression is set to: (Val(A1)+1)%2400;
The calculation channel A002 selects ON, and the operation expression is set to: Val(A1)>=600?-1:1; the lower limit of the range is -2.00, and the upper limit of the range is 2.00.
3, expression settings
(Val(A1)+1)%2400, Val(A1)>=600?-1:1 is the calculation formula for realizing this working mode, which can be set according to different needs.
For example, you need to set the operation for 5 minutes and stop for 2 minutes. You only need to change the formula to (Val(A1)+1)%4200, Val(A1)>=1200?-1:1, because the update time is 100ms, the formula The middle 4200 is the running and stopping time and the 1200 is the stopping time.
4, computing channel alarm settings
In order to realize the relay breaking, set the alarm channel as shown in Figure 6. The alarm channel selects A002, the alarm level 1 selects ON, the type selection is the upper limit, the output type selects the relay, and the output number is selected as X0102.
5, calculate and view the data
After the setting is completed, click on the operation, select Start Calculation, and observe the DO change in the overview or trend graph to realize automatic control.
1.3 data acquisition recorder and power meter with test
According to this connection method, the power meter is connected with the data acquisition to realize the hybrid measurement display, and the DO of the digital acquisition is used to automatically control the operation and stop of the motor.
Application case: A motor user wants to realize the three-minute operation of the motor, the continuous operation mode of one minute stop, and the simultaneous display of voltage, current and temperature. The DM100 and PA310 are used to realize this test requirement through Modbus communication.
1.4 Summary
The combination of the data acquisition recorder and the power meter can solve the conventional technical requirements of the motor condition simulation test, and the connection is simple and the construction is also very fast.
