Function and function of multi-function power meter: Multi-function power meter is a multi-functional intelligent meter with programmable measurement, display, digital communication and power pulse transmission output, which can complete power measurement, power measurement, data display, acquisition and transmission. , Multifunctional power meters are widely used in substation automation, distribution automation, intelligent buildings, and power measurement, management and assessment within enterprises. The measurement accuracy is 0.5, and it can realize LED on-site display and remote RS-485 digital interface communication, using MODBUS-RTU protocol. Suitable for power distribution cabinets and smart buildings.
Models of multi-function power meters: There are many models of multi-function power meters on the market, and the main current-retaining models are:
PZ568E-2S4/3S4/AS4 (digital tube display) and PZ568E-2SY (liquid crystal display) – can measure voltage, current, frequency, power, functional factor, electric energy at the same time;
PZ568E-27Y/9S7——can measure the active energy and reactive energy of three-phase electricity;
PZ568E-279/9S9 – can measure the current and active energy of three-phase electricity;
PZ568E-2S9A/9S9A/3S9A/AS9A——can measure the voltage, current, functional energy and reactive energy of three-phase electricity;
Installation method of multi-function power meter
Step 1. Select a good location on the power distribution cabinet and open the installation holes;
Step 2. After taking out the meter, loosen the fixing screw and remove the fixing clip;
Step 3. Insert the meter into the opened meter hole of the power distribution cabinet;
Step 4. Insert the instrument fixing clip to fix the positioning screw.
Frequently Asked Questions about the Common Faults of Multifunctional Power Meters
1. What should I do if the analog output signal is doubled?
Answer: It may be caused by the system wiring. Whether two AO outputs (analog outputs) are used at the same time and the negative ends are grounded at the same time. If so, the two outputs will interfere with each other. It is recommended to install a signal isolator to solve it.
2. What should I do if the background display of the switch input is suddenly disconnected and closed or falsely alarmed?
Answer: It may be due to the virtual connection of the auxiliary contacts of the switch on the line or the problem of the background setting, so check the line and background system settings.
3. What should I do if the switch input is not closed?
Answer: It may be due to the virtual connection of the auxiliary contacts of the switch on the line or the problem of the background setting, so check the line and background system settings.
4. What should I do if the relay output is abnormal?
Answer: Check the wiring or relay settings. There are three output modes of relay output: level, pulse and alarm. There are two output modes of level and pulse. For specific wiring, please refer to the product manual or contact the technical support of the relevant manufacturer.
5. What should I do if the digital output signal is abnormal?
Answer: Check the wiring or digital output settings. The digital output methods include electrical energy pulse output and alarm output. For specific wiring, please refer to the product manual or contact the technical support of the relevant manufacturer.
6. What should I do if there is no problem with the instrument wiring but there is no communication?
Answer: Instrument settings, check whether the instrument setting address and baud rate correspond to the system software. All instruments connected to the same communication channel should ensure that the addresses do not overlap and the baud rates are consistent.
7. What should I do if the backlight of the instrument flashes?
Answer: Check the alarm settings of the instrument, some instruments will flash the backlight when they are in an alarm state. If the instrument is in the alarm state, the instrument backlight will flash, after canceling the alarm, the backlight will return to normal
8. What should I do if the instrument cannot enter the parameter setting?
A: It is possible that a password has been set accidentally, please contact technical support for help.
9. What should I do if the current and voltage display is correct, but the power display is abnormal?
Answer: If there is a voltage or current wiring problem, carefully check whether the voltage or current wiring is exchanged or reversed between phases.
10. What should I do if the analog output signal is doubled?
Answer: It may be caused by the system wiring. Whether two AO outputs are used at the same time and the negative ends are grounded at the same time. If so, the two outputs will interfere with each other. It is recommended to install a signal isolator to solve the problem.
11. What should I do if the meter has no display?
Answer: Confirm whether the input voltage of the power supply is normal, check whether there is a virtual connection in the incoming line of the power supply of the instrument, and use a multimeter to measure whether the voltage of the incoming line terminal of the instrument is normal and meets the ordering requirements. whether the requirements are met. Make sure that the appropriate auxiliary power supply (AC/DC85-265V) has been added to the auxiliary power supply terminal of the instrument. The auxiliary power supply voltage exceeding the specified range may damage the instrument and cannot be recovered. You can use a multimeter to measure the voltage value of the auxiliary power supply. If the power supply voltage is normal and the meter has no display, you can consider powering off and re-powering on.
12. What is the reason why the instrument fails to display the required function?
Answer: Check whether the meter of this model contains this function. The meter you ordered should understand the functions it contains. Different models have different functions, so you should not blindly connect or use them blindly.
13. Why is the displayed value of current and voltage too large or too small (multiple relationship with the actual value)?
A: The transformer ratio of CT and PT of the meter itself is not set. You can check the user manual attached to the meter or contact technical support directly for help.
14. There are some obvious errors in the displayed values of voltage and current (for example, the B-phase voltage is too large) why?
Answer: It may be a problem with the setting of the wiring method. Change the wiring method of the voltage or current according to the actual wiring of the system in the instrument settings.
15. What should I do if the measured values of U, I, P, etc. are inaccurate?
Answer: It may be a wiring problem or a setting problem. First, you need to ensure that the correct voltage and current signals have been connected to the meter. You can use a multimeter to measure the voltage signal, and use a clamp meter to measure the current signal if necessary. Secondly, make sure that the connection of the signal line is correct, such as the same name end of the current signal (that is, the incoming line end), and whether the phase sequence of each phase is wrong. The multi-function power meter can observe the power interface display, only in the case of reverse power transmission, the active power data is wrong, and the active power data is wrong in general use. If the sign of active energy is negative, it is possible that the current input and output lines are connected incorrectly. Of course, the wrong phase sequence connection will also cause abnormal power display. In addition, it should be noted that the power displayed by the meter is the value of the primary grid. If the multiplier of the voltage and current transformer set in the meter is inconsistent with the multiplier of the actual transformer used, the power display of the meter will also be inaccurate. The voltage and current ranges in the meter are not allowed to be modified after leaving the factory. The wiring network can be modified according to the actual connection method on site, but the setting of the wiring method in the programming menu should be consistent with the actual wiring method, otherwise it will also lead to wrong display information.
16. What should I do if the electric energy is inaccurate?
Answer: It may be a wiring problem. The electric energy accumulation of the meter is based on the measurement of power. First observe whether the power value of the meter is consistent with the actual load. The multi-function power meter supports two-way energy measurement. In the case of wrong wiring, when the total active power is negative, the energy will be accumulated to the reverse active energy, and the positive active energy will not be accumulated. The most common problem used in the field is the reverse connection of the incoming and outgoing wires of the current transformer. The multi-function power meter can see the signed active power of the split phase. If the power is negative, it may be a wrong wiring. In addition, the wrong phase sequence connection will also cause the abnormality of the electric energy of the meter.
Post time: Nov-21-2022