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Check parameters on the screen
Monitoring screen can not be operated, it is a display only. It shows the basic information of the PCS dynamically.
| CODE. | ALARM |
|---|---|
| 0 | AC overvoltage |
| 1 | AC undervolatge |
| 2 | AC overfrequency |
| 3 | AC underfrequency |
| 4 | Grid volatge imbalance |
| 5 | AC phase reversed |
| 6 | Inverter island protection |
| 7 | Grid-connected & off-grid switch error |
| 8 | Ground fault |
| 9 | Grid Phase lock fault |
| A | Internal ambient over-temperature |
| B | Grid detection timeout |
| 10 | Emergency power off |
| 11 | Monitoring parameter setting failure |
| 12 | DSP version failure |
| 13 | CPLD version failure |
| 14 | Hardware version failure |
| 15 | CAN communication failure |
| 16 | Auxiliary power failure |
| 17 | Fan failure |
| 18 | Bus voltage overvoltage |
| 19 | Bus voltage undervoltage |
| 1A | Bus voltage imbalance |
| 1C | AC relay short circuit |
| 1D | Output voltage abnormal |
| 1E | Output current imbalance |
| 1F | Radiator over temperature |
| 20 | Output overload timeout |
| 21 | Grid overvolatge sustained |
| 22 | AC soft start failed |
| 23 | Inverter start failed |
| 24 | AC relay open circuit |
| 25 | U2 communication fail |
| 26 | DC compnent of AC excess |
| 27 | Master-slave sampling abnormal |
| 28 | EE Read error 1 |
| 29 | EE Read error 2 |
| 2A | EE Read error 3 |
| 2B | Inverter overload |
| 2C | DC parameter contradictory |
| 38 | DC overvolatge |
| 39 | DC undervolatge |
| 3A | DC ground fault |
| 3B | BMS failure |
| 3C | BMS connection timeout |
| 3D | EMS connection timeout |
| 40 | DC soft start failure |
| 41 | DC relay short circuit |
| 42 | DC relay open circuit |
| 43 | DC power overload timeout |
| 44 | Bus soft start failure |
| 45 | DC quick check overcurrent |
| 48 | DC current overcurrent |
| 90 | parameter setting error |
| 91 | low energy in the off-grid state |
| 92 | Neutral line not connected |
| 93 | High bus volatge in standby mode |
| 95 | Frequency change rate excess |
| 96 | Rapid change in grid phase angle |
Debugging with MODBUS
Before debugging, you need to download the Modbus software and get the communication protocol of the PCS. Usually, software and protocols should be provided by the manufacturer. Here are the steps.
1. Connection 1) The default communication method of the machine is Ethernet. So you need to connect with a network cable. One end of the network cable is connected to the Ethernet port of PCS, and the other end is connected to the computer. If the communication method is changed to RS485, you need to connect the controller and inverter with shielded twisted pair. One end of the line is connected to the RS485 port of the inverter, and the other end is connected to the RS485 interface in the controller
2) If you are using Ethernet communication, please change the IP address of the computer to the same network segment as the PCS. 3) Open the executive file in the Modbus Poll folder
2. Parameter examine and setting This part is based on the protocol of the inverter. Here are some of the variable settings that are often used. The rest of the variables are set in the same way. 1) Change the communication method (The register address is 325)
The method of setting is the same, and we will not introduce it below. The following variables are mainly describe the points that need attention.
2) Start up & Shut down (The register address is 650 & 651) 650: Start up 0: false 1: true; 651: Shut down 0: false 1: true. The start up and shut down commands can be sent once, and do not need to be sent repeatedly
3) Set active power (The register address is 135) This value has a magnification, please pay attention when setting. When you want the PCS to run 10 kW, you need to set 100 kW. Because the magnification is 10.
4) Set DC protection parameters (The register address is 808–814) 808: Float charging voltage; 809: Slow charging voltage; 810: Current from slow charging to float charging; 811: Max charging current; 812: Max discharging current 813: Lower voltage limit of battery protection; 814: Upper voltage limit of battery protection. These variables are also with magnification, so you need to be careful when setting.
5) Off-grid & On-grid setting (The register address is 653 & 654) 653: Start up 0: false 1: true; 654: Shut down 0: false 1: true. When the grid side is still connected, the off-grid command cannot be sent, or disconnect the grid after sending. Off-grid requires the grid to be truly disconnected, and the on-grid needs a true connection of the grid. This is the basic principle.
6) Baud rate change for RS485 communication(The register address is 320) 0: 19200, 1: 9600, take effect after hard reset.