Low power generation
1. Check component configuration: including component model, number of components in series, access mode, installation Angle and azimuth Angle; For the same MPPT unit, ensure that the component model, number of components in series, installation inclination, and azimuth are consistent.
2. Check the AC side cable and power grid voltage; Too thin cable will lead to excessive cable loss; High grid voltage can cause the inverter bus to be too high, causing the inverter to not track the optimal operating point (side duty ratio limit).
3. Confirm that the installation environment of the unit/cooling fan is working normally; Direct sunlight, blocked radiators, and damaged external fans cause the inverter to trigger over temperature load reduction and over temperature protection, which affects the power generation.4. Check whether the inverter clock is normal.
A string exception alarm is generated
1. Check whether the battery string configuration is abnormal.
2. Check whether the battery string access is abnormal, such as whether the two branch panel configurations of the same MPPT are inconsistent, or the panel configurations of different MPPT are inconsistent.3. Check whether battery current and voltage sampling are abnormal when the system is running.
The positive and negative bus-ground voltage insulation is faulty
1. Use a multimeter to check whether the PV+/- to ground voltage is abnormal.2. Use a multimeter to check whether the positive and negative bus voltages to ground inside the inverter are abnormal.
3. Check whether the voltage sampling between the positive and negative bus bars in the background is abnormal. If the sampling is abnormal, replace the detection board.
Internal communication exception
1. Check whether the software version on the two sides is the same. If the software version is the same, reset the fault and see whether it can be eliminated.
2. Power on the monitoring board to check whether the fault is rectified.3. If the above fails, replace the detection board.
The module is overheated or the external fan is abnormal
1. Check whether the AC auxiliary source is damaged. Turn off all DC switches after the netcol5000-C is shut down. If the netcol5000-C is powered off, the AC auxiliary source is damaged.
2. Check whether the power supply terminal of the external fan detection board is abnormal.3. If the AC auxiliary source is not faulty, check whether the external fan is damaged. Switch the system control mode to background control and set G-25.58 and G-25.59 to 1 respectively to check the operating status of the external fan. If necessary, check the operating status of the fan one by one. (Connect the fan power supply terminals to the detection board for verification.)
Internal fan exception
1. After the device is shut down, check whether the power supply terminal of the internal fan detection board is abnormal.2. After the power supply is normal, manually test the internal fan and set G-25.51 to 1. If the fan does not work, replace the internal fan
Auxiliary power failure
3. Replace the faulty board after it is found.
1. Check whether the power-on fault is rectified after the DC auxiliary source is replaced.2. After replacing the DC auxiliary source, the fault still indicates that it is not a DC auxiliary source problem. Remove the lower DC power board. Remove the lower DCDC board one by one, check the background, and check whether the fault is rectified. If the fault persists after all DCDC board cables are removed, use the preceding method to locate the DCAC and relay boards until the fault is rectified.
Filter capacitor under voltage/inverter concurrent timeout
1. After the fault is reset, the whole system opens the ring wave. Check whether the wave generation of the DCAC board is abnormal. If the DCAC board is abnormal, replace the DCAC board.2. If the wave shape of the system is normal, check whether the capacitor voltage sampling of the detection board is normal. If it is abnormal, replace the detection board.
Relay open-circuit fault
1. Note: When checking relay fault, be sure to break the box and change the circuit breaker!!
2. After fault resetting, first check whether grid-connected relays can be closed normally. For specific operations, put G-01.42 and R-01.13 on the top, check G-01.42 middle 2, then G-01.42 middle 6, then the main relay is closed, and finally check R-01.13 middle 3, then the secondary relay is closed. Whether the relay is closed can be judged by sound;3. After the driver signal of the master and slave relays is given, the relays are closed. The multimeter measures whether the impedance at both ends of the relay (inverter inductance terminal and power grid cable terminal) is about 0Ω. If there is a large impedance or infinity, it indicates that the relay is really open, and the relay board can be replaced.
Relay short-circuit fault
1. Check whether the DCAC board generates normal
waves. If the DCAC board is damaged, replace the DCAC board.
2. If the open loop wave is normal, check whether the grid voltage sampling (effective value) and capacitor voltage sampling (effective value) are normal. If the sampling voltage is abnormal, replace the detection board;
3. None of the above problems, replace the relay board to deal with.
The PID is abnormal
1. Connect to the system background and check the PID operation of the G-03.60 inverter. In normal cases, set the PID to 1.2. Turn off all the DC switches. When the BUS voltage is lower than 300V, select 3 and 4 in G-01.42 (PID input and output relay drive), and use a multimeter to measure whether the bus-PE voltage is about 900V. If no voltage PID board is damaged, replace the PID board.