【Question 1】The ABB ACS880 frequency converter reports a DCOVERVOLT3210 fault. How should this be handled?
【answer】
Add parameters 2202 and 2203 to the parameter time group; if the increase is large enough, the alarm will continue. When adjusting the speed, increase the time during speed adjustment and adopt staged acceleration and deceleration. For example, when the motor accelerates, accelerate from 0-400-600-800-1000-1200-1400 r/min. In the first stage, wait for the speed to stabilize before accelerating again. The same applies when decelerating.
【Question 2】The ABB ACS880 frequency converter reports an OVERCURRENT2310 fault. How should this be handled?
【answer】
Add parameters 2202 and 2203 to the parameter time group; if the increase is large enough, the alarm will continue. When adjusting the speed, increase the time during speed adjustment and adopt staged acceleration and deceleration. For example, when the motor accelerates, accelerate from 0-400-600-800-1000-1200-1400 r/min. In the first stage, wait for the speed to stabilize before accelerating again. The same applies when decelerating.
【Question 3】How should the parameters be set for the following ACS880 PID control application? The air pressure of the air storage tank in a factory needs to be kept stable at 1.2MPa. The pressure sensor has a range of 2MPa and outputs a 4~20mA current signal.
【answer】
1. First, input 99 sets of motor parameters, such as rated current, voltage, frequency, speed, etc.
2. 95.01 = 380…415V Select the power supply voltage range
3. Select motor control mode 99.04=DTC, check whether the motor is connected to the load, and then identify the motor: if the "scalar" mode is selected, identification is not required.
4. 96.04 = 3, select PID control macro.
5. 12.27 = 4mAAI2 minimum value
6. 23.12 = 5 seconds of deceleration time
7. 23.13 = 5 seconds acceleration time
8. Parameters 40 are the most important in PID control, and it is crucial to clearly define the settings of the "setup value" and "feedback value". In this example, the sensor's range is 2MPa, and the required stable pressure is 1.2MPa. Therefore, the setup value = 1.2/2 = 60%. AI2 is set to current input by default, so the sensor's output line is connected to AI2.
40.07=2; 40.08=2; 40.12=%; 40.16=Internal setpoint; 40.21=60; 40.31=Not inverted; 40.32=Default value ratio; 40.33=Default value integral; 40.34=Default value derivative; 40.41=Internal sleep mode; 40.43=150, sleep level value, determined by comparison with PID output value; 40.44=60S, sleep delay; 40.47=10, wake-up deviation; 40.48=5S wake-up delay.
Finally, check if the inverter is connected correctly according to the PID control macro wiring diagram. After checking the load connection, start the machine for testing and operation.
【Question 4】Both N652 and N697 are software developed by ABB for hoist applications. What are the differences between them in terms of control interface, control ground, speed/torque control of a single machine, light load operation above rated speed, and master-slave operation?
【answer】
Both software programs are developed by ABB and are suitable for hoist applications. Both use the ACS800 DTC technology as their control basis. The N652 has a more fixed function configuration, while the N697 is more flexible.
【Question 5】What are the basic principles of parallel configuration of Siemens G150 frequency converters?
【answer】
The configuration should include the following:
Ø（1）Main power supply section x2, main circuit breaker and main contactor x2, power supply assembly x2, motor connection assembly x2.
(2) The components that only need one in the configuration are CU320, AOP30, and TM31.
The power range of the G150 that can be connected in parallel is shown in Table 1 (Note: When connected in parallel, the output current of the G150 will decrease accordingly).
Table 1
【Question 6】How is the 6-pulse parallel configuration of the Siemens G150 frequency converter achieved?
【answer】
Basic configuration principles:
Ø（1）Applicable to dual-winding transformers;
Ø（2） An incoming line reactor Uk=2% must be configured (alelative short-circuit voltage of Uk=2%, option L22 cannot be selected);
Ø（3）DC bus parallel connection;
Ø（4）Can be connected to a dual-winding or single-winding motor;
Ø (5) Symmetrical cables must be used (e.g., cables connecting the transformer to the power input side of the inverter and cables for parallel bus connections should use cables with the same cross-sectional area and length; the connection cables between the motor module and the motor must also be symmetrical cables).
Ø（6） When connecting a single-winding motor, the control mode is space vector (SVM); when connecting a dual-winding motor: space vector (SVM) + pulse width edge modulation (PEM).
Ø（7）When the winding motor is connected, the maximum output voltage is 92% of the input voltage; when the dual winding motor is connected, the maximum output voltage is 97% of the input voltage.
