1. Is the system pressure unstable and prone to oscillation?
A: Unstable system pressure may be caused by the following reasons:
A. The pressure sensor in the system is positioned incorrectly; the pressure sensor point is too close to the water pump outlet, causing the pipeline pressure to be significantly affected by the water flow rate. This results in fluctuating pressure values reported to the controller, causing system oscillations.
B. Additionally, if the system uses a pressure tank and the pressure acquisition point is located on the pressure tank, it may also cause system oscillation. This is because air itself has a certain degree of elasticity, and the solubility of gases in water changes with pressure. There is a time difference between the water pump output and the pressure transmission through the gas, which can cause system oscillation.
C. The acceleration and deceleration times of the controller and frequency converter do not match the power of the water pump motor. Generally, the higher the power, the longer the acceleration and deceleration time. Users can select several data points for testing this parameter. For example, for 15KW, it is generally between 10 and 20 seconds.
2. Is the small pump starting and stopping too frequently?
A: The issue lies with the controller's 11th parameter, the small pump stop pressure error, which is too small. After all main pumps are shut down, the small pump starts when the actual system pressure is lower than the set pressure. As the system pressure rises, the small pump shuts down when the actual system pressure exceeds the sum of the set pressure and the small pump stop pressure error. Therefore, the solution is to increase this parameter by a certain value.
3. The analog output is abnormal; the inverter's operating frequency does not match the controller's output.
A: First, determine which hardware is malfunctioning. Put the controller into manual debugging mode and use a multimeter to measure the analog output values at 0Hz and 50Hz. If the controller's analog output value is greater than 30mV at 0Hz, or less than the voltage value calibrated by parameter 5 at 50Hz, then there is a problem with the controller output. There are several possibilities:
A. If the output remains unchanged as the controller frequency changes, it indicates that the controller's analog output circuit is damaged.
B. If the analog output value also changes but cannot reach the maximum value, this can be resolved by adjusting the VR3 potentiometer in the controller window.
Secondly, if the controller's output value is normal, but the inverter cannot reach 50Hz when the controller output reaches its maximum value, it indicates that there is a problem with the inverter's setting value, which can be solved by adjusting the inverter's frequency gain.
4. Why is the inverter output not zero when the water pump is switched?
A: Users should ensure that all control lines from the controller to the frequency converter are connected. When the water pump switches, the controller sends a coasting stop signal (EMG signal) to the frequency converter. Some users have not connected this EMG signal line, directly causing the above situation. This practice must be strictly prohibited, otherwise, it can easily damage the frequency converter. If there is an EMG signal line, please carefully check whether the wiring is secure. After confirming that the connection is secure and there are no wiring faults, use a multimeter to check whether the controller's EMG output is present. If there is no EMG signal output when the controller is switching, then the problem lies with the controller.
5. How should the anti-interference wiring be connected between the controller and the frequency converter?
A: To prevent interference from electromagnetic fields in the space from the control signal lines of the controller and frequency converter, a shielded cable can be connected to the outer layer of these control signal lines to improve the system's anti-interference capability. It is crucial to ensure that only one grounding point is selected for the shield, regardless of whether it is on the controller side or the frequency converter side. This guarantees improved anti-interference capability. If the shield is grounded at both ends, a potential difference will be generated on the shield, which will not only fail to improve the system's anti-interference capability but will also exacerbate external interference to the controller.
6. How to resolve the issue of controller data malfunctioning or occasionally being incorrect?
A: This situation is caused by severe interference to the controller. The controller often operates in harsh environments, with interference signals coming from multiple sources. After modifying the controller's status or parameters, users must always switch the black keyboard lock switch in the controller's small window to the LOCK position. This not only prevents unauthorized parameter modifications but also ensures that system data does not become corrupted. If the data is occasionally abnormal, but the controller continues to run automatically without stopping, and the system's stability pressure remains unchanged, the controller can automatically read back the original data. If the controller is no longer functioning properly, users can disconnect the controller's power supply, wait a while, and then restart it; the system will then return to normal operation. If the user forgets to lock the keyboard lock switch, and the settings have been overwritten, the user will need to reset the system parameters. After setting, remember to lock the switch.
7. The contactor controlling the motor does not operate, and the motor does not start?
A: First, check the controller's output status displayed on the control panel. Refer to the controller's instruction manual for the settings and operating indicators of the seven pumps on the panel. If the indicator for the pump corresponding to a non-operating motor shows output, check the external contactor wiring and relay logic for correctness. If these are correct, use a multimeter to measure the output of the corresponding relay on the controller. If the relay does not output a closed switch signal, the controller's relay output is faulty. If the corresponding pump on the panel also shows no output, check the controller's parameter settings to see if the corresponding pump is set to the ON state.
8. The pressure sensor shows a pressure change, but the panel displays no change in pressure?
A: First, check if the wiring of the pressure sensor and controller is loose or has poor contact. If these issues are not present, use a multimeter to measure the voltage at the controller's analog input port. First, measure the voltage between the SV terminal and the GND terminal. If it is 5V, the power supply to the analog input port is normal, and proceed to the next step. Connect a 10K ohm sliding resistor to the three terminals of the controller's input port, with the moving terminal connected to P1. Then measure whether the voltage between the P1 terminal and the GND terminal of the controller changes with the resistance value. If the voltage between the P1 terminal and the GND terminal does not change, the controller's analog output port is faulty or damaged. If it is normal, the problem lies with the remote pressure gauge. Replace the pressure gauge.
9. Why does the host machine keep running even when the system pressure is higher than the set value during operation?
A: The main reasons may be one of the following:
1. If the pressure detected by the pressure sensor does not match the pressure displayed on the control panel (i.e., the pressure sensor reading is higher than the set value, but the pressure displayed on the control panel is within the set value), check if the pressure sensor is damaged or if there is a wiring problem. In this case, it is normal for the controller to continue operating.
2. If the above situation does not exist, and the pressure from the controller and sensor matches and is higher than the set pressure, then check the setting status of the auxiliary pump to see if it is on. If the auxiliary pump is off, it is normal for the main unit to continue running. If the auxiliary pump is on, check the operating frequency of the main pump. If the minimum frequency is not the set value, it indicates that the system is in a normal water supply process.
10. Why can't fire pumps be inspected regularly?
A: First, check if the fire alarm timed inspection function of the controller is enabled. Its function code is item 12. If this function is enabled and a timed inspection value has been set, please check the controller's operation record to see if there has been a power outage. If the controller experiences a power outage during operation, it will re-record the time, and the inspection function will only be performed when the set inspection time arrives.
11. The controller clock is running normally, but the control section has no output or the controller does not respond at all.
A: In this situation, the main problem is a serious error in the controller's data. The main errors include the following parameters: Item 6, the inverter's power value exceeds 200KW; Item 7, the inverter's acceleration/deceleration time exceeds 200 seconds; Item 8, the lower frequency limit exceeds 50Hz. If this occurs, first disconnect the controller's power supply, wait a period of time (at least 15 seconds), and then reconnect the power. The system should usually return to normal. If the system remains unchanged, it indicates that the data memory has been overwritten. Please reset the parameters to correct this. After modification, please remember to switch the keyboard lock switch to the LOCK position.
12. How to use traffic compensation, and what is the difference between internal and external compensation?
A: Flow compensation is a compensatory measure used to stabilize the remote pipeline network. The C1 type controller offers two flow compensation methods: internal and external compensation. The main difference lies in the calculation method. Internal compensation involves calculating the value using a quadratic curve function determined by a specific pipeline flow loss curve during controller programming. This value is then added to the controller's normal analog output value to obtain the final result, which controls the pump speed, thereby compensating for pipeline pressure. External compensation, on the other hand, uses the value fed back from an externally connected flow meter, which is converted and then superimposed on the controller's normal output value. For specific wiring instructions for internal and external compensation, please refer to the controller's instruction manual or the wiring diagrams shown in this application guide.
13. The controller does not start the pump, and the RUN light flashes. Why?
A: This is because the controller is currently in a timed shutdown state. The user has set the controller's 16th function code to ON and specified the controller's power-on and power-off times, and the controller's clock is currently within this time period. Simply change the controller's 16th parameter.
14. In the controller, what is the function of K2?
A: Switch K2 is used to expand the functionality of the controller, and users do not need it at present.
15. How to resolve the communication error and issue 08?
A: First, ensure the communication cable is securely connected. If the problem persists, then check if the controller's main unit is still functioning correctly. To do this, connect the controller's RUN/STOP and GND terminals to put it in automatic mode. Observe if the RUN light on the controller's main unit illuminates. Repeat this several times. If the RUN light changes accordingly, the controller's main unit is still functioning normally. Otherwise, the controller is damaged. Please contact us.
16. Why does the panel always display P000?
A: First, check if the controller's parameter settings are correct. Check if parameter 3 (the controller's pressure range) is set to zero. If it is not zero, disconnect the control wires from several terminals of the pressure sensor on the controller. Use a multimeter to measure whether there is a 5V DC voltage between the SV terminal and the GND terminal. If it is normal, the panel should display the normal pressure range. Otherwise, the controller is damaged. If the measured result is not 5V, it indicates a fault in the power supply to the analog output signal.
17. What should I do if I can't unlock the keyboard?
A: This issue is usually caused by a faulty keyboard lock switch. Try toggling the switch up and down several times, or forcefully pushing it into place. If the problem persists, disconnect the controller's power, add a small amount of industrial alcohol to the black switch, and toggle it a few more times. After the alcohol has evaporated, test the power. If the problem still doesn't resolve, the switch must be replaced.
18. Why can't I switch the pump?
A: If the pump switching action fails to complete every time the controller receives a switching signal, it indicates a problem with the wiring of the external control logic. If the controller fails to switch pumps while operating normally, it indicates that the controller is experiencing significant interference. Users can check the wiring using the anti-interference wiring methods mentioned earlier, and modify the controller wiring appropriately if necessary.
19.04 alarm, what should be done?
A: Alarm 04 indicates that the controller has detected a water level signal. Please check the wiring of the water level sensor. If the wiring is normal, disconnect the wire and short-circuit the water level signal with a jumper wire. If the problem persists, the water level detection section of the controller is faulty. Otherwise, the problem lies with the water level sensor.
20. If there is only one water level signal in the system, how should the controller be wired?
A: At this point, LA2 on the controller can be shorted, and the water level signal can be connected to LA1. Note the signal type provided by the water level sensor; correct connection to the controller is essential for the system to function properly.
21. Why did the controller fail to change the pump at the set time interval?
A: When the system pressure is stable and the water pump does not switch, the controller should perform pump switching at the set time intervals. If a pump switch occurs or the pump stops midway during this process, the timed pump switching interval will reset. If the pump fails to switch at the set time interval, please continuously monitor the controller. If no such situation occurs within the set time period, and no pump switching occurs on schedule, the controller is faulty.
22. What could be the reason why the water pump does not start for an extended period of time when the feedback pressure is lower than the set pressure?
A: In this case, please check the setting value of item 13 in the controller's settings. This item sets the pump switching pressure error for the controller. To prevent frequent pump starts and stops, the pump will not start, stop, or switch if the pressure is within the range of the set value minus this error value (lower limit) and the set value plus this error value (upper limit). Therefore, if the user feels that the controller does not start the pump for too long, this parameter should be set lower.
