User Manual for PV Current models including: HS-PV5-MU4, HS-PV5-MU Series Combiner Box Monitor, Series Combiner Box Monitor, Combiner Box Monitor, Box Monitor, Monitor, HS-PV5-MU8, HS-PV5-MU12, HS-PV5-MU16, HS-PV5-MU20, HS-PV5-MU24
Solis S6-EH1P5K-L-PLUS 5kW Hybrid Solar Inverter Wi-Fi – VoltaconSolar
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DocumentDocumentUser manual PV CURRENT COMBINER BOX MONITOR SPECIFICATIONHS-PV5-MU4/8/12/16/20/24 VERSION: V 4.1 All the pictures and product specifications are only for reference, because of the update of products and technology. There are differences between products and manual. Please contact us if you want to get more information about the product. ATTENTION WARNING! This symbol shows an attention or a warning to remind the dangerous and safety. The hardware will be damaged if the user operate in a worry way. NOTE! This symbol shows an attention to make the product word well. SAFETY INSTRUCTIONS Please read this manual carefully before installation. If the product is damage with a wrong installation, we would not provide quality assurance. WARNING: Pease do all the operation and wiring professional with electrical technician or electrical engineer. WARNING: Please don't touch other parts of the box when you install except the terminal. WARNING: All operation and wiring must conform to the requirements of the relevant standards! WARNING: Please cover the PV panel with the opaque material when you install. CATALOGUE 1. Product introduction ................................................................................ 1 2. Model description ..................................................................................... 1 3. Introduction............................................................................................... 2 4. Features...................................................................................................... 2 5. Technical parameters ............................................................................... 3 6. Configuration software............................................................................. 3 7. Shape Size .................................................................................................. 4 8. Interface Function..................................................................................... 5 9. Operating description............................................................................... 6 10. Communication protocol........................................................................ 8 11. Packaging and shipping ....................................................................... 20 12. Quality Assurance................................................................................. 20 13. Safety operation at the scene ............................................................... 21 PV Current Combiner Box Monitor 1. Product introduction HS-PV5-MU4/8/12/16/20/24, PV current combiner box monitor, is a product, which integrate the power supply, voltage acquisition, the current acquisition of PV string and acquisition of lightning arrester into one product. And it has the characteristic of small volume, no fan, wide temperature operation and high anti-interference. It adopt RS485 interface and support MODBUS protocol. 2.Model description HS---- PV string: 4/8/12/16/20/24 MU: Monitor PV5: Photovoltaic 1500V HS: Company name -1- 3. Introduction Acquire the current of PV string, include 4/8/12/16/20/24 string; Acquire the voltage of PV string, MAX DC 1500V; Acquire the temperate of PV current combiner box; Acquire the state of the lightning arrester Acquire the state of the circuit breaker Communication: RS485 Communication protocol: MODBUS Communication baud rate: 2400,4800 9600 Communication address:1~100 4. Features A wide input voltage rage, DC300~DC1500V A flame-retardant shell Acquire the isolated analog quantity Acquire the isolated digital quantity A wide temperature operation: -30~75 Easy matches Matches a RF module to reduce wiring Flexible installation mode Easy disassembly -2- 5. Technical parameters Technical parameter table Input DC power input DC300V~DC1500V PV string current input 4/8/12/16/20/24 branches, 0~25A, 0.5% Interface Communicate interface Digital quantity input RS485 3 ways, 2500V isolation LED display 8 bits Operating Environment Power Operating temperature Storage temperature Relative humidity Shape size 3W -30~+75 -40~+85 5~95 (No condensation) Length * width * height Host unit:107mm*87mm*58mm Acquisition unit: 72mm*42mm*39mm Installation mode Host unit: DIN rail Acquisition unit: DIN rail OR hang 6. Configuration software The configuration software includes the following functions: Modify the communication parameters of the product; Record and analysis of real-time data; Telesignalling alarm; Set the alarm value Parameter configuration interface -3- 7. Shape Size 1) Host and acquisition unitunitmm Host 2)Mounting plate 16 branches 20 branches -4- 8. Interface Function 1) Host unit Number Interface definition 1 5V 2 G 3 G0 4 D1 5 D2 6 D3 7 K 8 C 9 B 10 A 11 G0 12 P PV+ V+ PV- V- Function 5V + 5V Switch acquisition G Switch acquisition 1 Switch acquisition 2 Switch acquisition 3 NC NC RS485 B RS485 A RS485G PE DC1500V + DC1500V - DC 300-1500V V- V- V+ V+ 2) Acquisition unit: 5V G G0 D1 D2 D3 K C B A G0 P Switch RS485 PE NOTE: The connector can only be connected from the first acquisition unit. -5- 9. Operating description The man-machine interface includes: LED display, 3 button, PV string current input, and 3 indicator lights. 1) LED display and button The LED display includeThe value of the current ,voltage, power, baud rate, address, temperature, etc. The buttons include: up ,down and function key (F.K.). 2) Indicator lights description: RUN: when this light gleamed, the monitor is normal running. RX: when this light is up, the monitor is receiving data. TX: when this light is up, the monitor is transmitting data. 3)Button operating description: Polling display Password Input F.K. Up/Down F.K. Error Right Address Input Save F.K. Up/Down F.K. F.K. Baud rate Input Save F.K. Up/Down F.K. Display current HM String num Input Save F.K. Up/Down F.K. Function Input Save F.K. Up/Down F.K. NOTE: Press up, can exit the setup when display a save. -6- The sequence of the button operation 0. Wake up the LED display 1. Enter a password: PASS **00 2. Confirm the password: PASS **01 3. Choose a address: Addr *100(1-100) 4. Save the address: Addr SAVE 5. Choose a baud rate: b3** 9600 6. Save the baud rate: b*** SAVE 7. Choose a channel number: Td** **16 8. Save the channel number: Td** SAVE 9. Choose special function: d*** 0000(reserve, cannot be modified) 10. Save the special function: d*** SAVE 11. Display the value of channel current(If the password is error, display the value of bus. If the password is right, display the value of channel.) Press up and down: Value of current: 01*- 00.00 --A Value of power: P*00 0000 --W Value of state: S**0 0000 NOTE: The value of state correspond to the state of upper limit alarm, lower limit alarm, zero value alarm, reverse value alarm, unbalance alarm 12. Display the voltage: U**0 000.0 13. Display the state of the voltage: S**0 0000 14. Display the total power:UA00 0000 --W 15. Display the electrical energy: E*00 0000 KWh 16. Display the state of digital quantity : S123 *000 17. Display the acquisition mode: Ad** ***1(reserve, cannot be modified) 18. Save the acquisition mode: SAVE ***1 19. Display the temperature: Co* +/- 000.0 -- 20. Save the temperature: SAVE 000.0 21. Exit the fixed display, begin the auto display. -7- 10.Communication protocol The communication protocol is MODBUS RTU. This protocol has a high data density, and a big throughput rate. The baud rate can choose to be 240048009600. 1Communication set description Format Content Mode MODBUS RTU Baud rate 9600default Data bits 8 bits Parity check bit No Stop bit 1 bit Frame check 2 MODBUS function code description CRC16 0x03 Read data command. Include channel current, voltage, and telecommunication. 0x01 Read telecommunication command. Read telecommunication only. 3 MODBUS message format description 0x03 function code description Request code format: Definition Address Function code Data ADDR 03H byte 1 1 Response request code format: Definition Address Function code data ADDR 03H byte 1 1 0x01 function code description Request command code format: Definition Address Function code data ADDR 01H byte 1 1 Response request code format: Start address sREG 2 Response bytes X 1 Start address sREG 2 Words nREG 2 CRC check CRC16 2 Response data DATA X CRC check CRC16 2 Words nREG 2 CRC check CRC16 2 -8- Definition Address Function code data ADDR 01H byte 1 1 4address map and data: Response bytes X 1 Response data DATA X CRC check CRC16 2 Word address context Word length ratio 0x1000 PV string channel current 1 1 0.01A 0x1001 PV string channel current 2 1 0.01 A 0x1002 PV string channel current 3 1 0.01 A 0x1003 PV string channel current 4 1 0.01 A 0x1004 PV string channel current 5 1 0.01 A 0x1005 PV string channel current 6 1 0.01 A 0x1006 PV string channel current 7 1 0.01 A 0x1007 PV string channel current 8 1 0.01 A 0x1008 PV string channel current 9 1 0.01 A 0x1009 PV string channel current 10 1 0.01 A 0x100A PV string channel current 11 1 0.01 A 0x100B PV string channel current 12 1 0.01 A 0x100C PV string channel current 13 1 0.01 A 0x100D PV string channel current 14 1 0.01 A 0x100E PV string channel current 15 1 0.01 A 0x100F PV string channel current 16 1 0.01 A 0x1010 PV string channel current 17 1 0.01 A 0x1011 PV string channel current 18 1 0.01 A 0x1012 PV string channel current 19 1 0.01 A 0x1013 PV string channel current 20 1 0.01 A 0x1014 PV string channel current 21 1 0.01 A 0x1015 PV string channel current 22 1 0.01 A 0x1016 PV string channel current 23 1 0.01 A 0x1017 PV string channel current 24 1 0.01 A 0x1018 Voltage 1 0.1V -9- 0x1019 0x101A 0x101B 0x101D 0x101F 0x1021 0x1023 0x1025 0x1027 0x1029 0x102B 0x102D 0x102F 0x1031 0x1033 0x1035 0x1037 0x1039 0x103B 0x103D 0x103F 0x1041 0x1043 0x1045 0x1047 0x1049 0x104B 0x104D 0x104E 0x104F Total current 1 Temperature 1 Total powerhigh first 2 Channel power 1 2 Channel power 2 2 Channel power 3 2 Channel power 4 2 Channel power 5 2 Channel power 6 2 Channel power 7 2 Channel power 8 2 Channel power 9 2 Channel power 10 2 Channel power 11 2 Channel power 12 2 Channel power 13 2 Channel power 14 2 Channel power 15 2 Channel power 16 2 Channel power 17 2 Channel power 18 2 Channel power 19 2 Channel power 20 2 Channel power 21 2 Channel power 22 2 Channel power 23 2 Channel power 24 2 Telesignal 1 1 Telesignal 2 1 Telesignal 3 1 -10- 1A 0.1 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1W 1 1 1 0x1050 0x1051 0x1052 0x1053 0x1054 0x1055 0x1056 0x1057 0x1058 Telesignal 4 Telesignal 5 Telesignal 6 Telesignal 7 Telesignal 8 Telesignal 9 Telesignal 10 Reserve Reserve 1 1 1 1 1 1 1 1 1 1 1 1 1 1 NOTE! About the current of channel, voltage, temperature: The data format is 16 bits unsigned integer. (High bit first.) NOTE! About the temperature 0x101A the data format is 16bits complemented integer. (High bit first).Unit is For example, 0xff38 stand for -20. NOTE! About the Switch state When the switch off, the switch state is 0, when the switch on, the switch state is 1. 5Telesignal address map: Register address Register content 0x0100 0x0101 PV string channel 1 current Zero value state PV string channel 1 current low value state -11- 0x0102 0x0103 0x0104 0x0105 0x0106 0x0107 0x0108 0x0109 0x010A 0x010B 0x010C 0x010D 0x010E 0x010F 0x0110 0x0111 0x0112 0x0113 0x0114 0x0115 0x0116 0x0117 0x0118 0x0119 0x011A 0x011B 0x011C 0x011D 0x011E 0x011F 0x0120 0x0121 0x0122 0x0123 PV string channel 1 current high value state PV string channel 2 current Zero value state PV string channel 2 current low value state PV string channel 2 current high value state PV string channel 3 current Zero value state PV string channel 3 current low value state PV string channel 3 current high value state PV string channel 4 current Zero value state PV string channel 4 current low value state PV string channel 4 current high value state PV string channel 5 current Zero value state PV string channel 5 current low value state PV string channel 5 current high value state Reserve PV string channel 6 current Zero value state PV string channel 6 current low value state PV string channel 6 current high value state PV string channel 7 current Zero value state PV string channel 7 current low value state PV string channel 7 current high value state PV string channel 8 current Zero value state PV string channel 8 current low value state PV string channel 8 current high value state PV string channel 9 current Zero value state PV string channel 9 current low value state PV string channel 9 current high value state PV string channel 10 current Zero value state PV string channel 10 current low value state PV string channel 10 current high value state Reserve PV string channel 11 current Zero value state PV string channel 11 current low value state PV string channel 11 current high value state PV string channel 12 current Zero value state -12- 0x0124 0x0125 0x0126 0x0127 0x0128 0x0129 0x012A 0x012B 0x012C 0x012D 0x012E 0x012F 0x0130 0x0131 0x0132 0x0133 0x0134 0x0135 0x0136 0x0137 0x0138 0x0139 0x013A 0x013B 0x013C 0x013D 0x013E 0x013F 0x0140 0x0141 0x0142 0x0143 0x0144 0x0145 PV string channel 12 current low value state PV string channel 12 current high value state PV string channel 13 current Zero value state PV string channel 13 current low value state PV string channel 13 current high value state PV string channel 14 current Zero value state PV string channel 14 current low value state PV string G channel 14 current high value state PV string channel 15 current Zero value state PV string channel 15 current low value state PV string channel 15 current high value state Reserve PV string channel 16 current Zero value state PV string channel 16 current low value state PV string channel 16 current high value state PV string channel 17 current Zero value state PV string channel 17 current low value state PV string channel 17 current high value state PV string channel 18 current Zero value state PV string channel 18 current low value state PV string channel 18 current high value state PV string channel 19 current Zero value state PV string channel 19 current low value state PV string channel 19 current high value state PV string channel 20 current Zero value state PV string channel 20 current low value state PV string channel 20 current high value state Reserve PV string channel 21 current Zero value state PV string channel 21 current low value state PV string channel 21 current high value state PV string channel 22 current Zero value state PV string channel 22 current low value state PV string channel 22 current high value state -13- 0x0146 0x0147 0x0148 0x0149 0x014A 0x014B 0x014C 0x014D 0x014E 0x014F 0x0150 0x0151 0x0152 0x0153 0x0154 0x0155 0x0156 0x0157 0x0158 0x0159 0x015A 0x015B 0x015C 0x015D 0x015E 0x015F 0x0160 0x0161 0x0162 0x0163 0x0164 0x0165 0x0166 0x0167 0x0168 0x0169 0x016A 0x016B 0x016C 0x016D PV string channel 23 current Zero value state PV string channel 23 current low value state PV string channel 23 current high value state PV string channel 24 current Zero value state PV string channel 24 current low value state PV string channel 24 current high value state Reserve Reserve Reserve Reserve Voltage low value/high value state Reserve Reserve Reserve Reserve Reserve Reserve Reserve Switch 1 state Switch 2 state Switch 3 state Reserve Reserve Reserve Reserve Reserve PV string channel 24 current reverse alarm PV string channel 23 current reverse alarm PV string channel 22 current reverse alarm PV string channel 21 current reverse alarm PV string channel 20 current reverse alarm PV string channel 19 current reverse alarm PV string channel 18 current reverse alarm PV string channel 17 current reverse alarm PV string channel 16 current reverse alarm PV string channel 15 current reverse alarm PV string channel 14 current reverse alarm PV string channel 13 current reverse alarm PV string channel 12 current reverse alarm PV string channel 11 current reverse alarm -14- 0x016E 0x016F 0x0170 0x0171 0x0172 0x0173 0x0174 0x0175 0x0176 0x0177 0x0178 0x0179 0x017A 0x017B 0x017C 0x017D 0x017E 0x017F 0x0180 0x0181 0x0182 0x0183 0x0184 0x0185 0x0186 0x0187 0x0188 0x0189 0x018A 0x018B 0x018C 0x018D 0x018E 0x018F 0x0190 0x0191 0x0192 PV string channel 10 current reverse alarm PV string channel 9 current reverse alarm PV string channel 8 current reverse alarm PV string channel 7 current reverse alarm PV string channel 6 current reverse alarm PV string channel 5 current reverse alarm PV string channel 4 current reverse alarm PV string channel 3 current reverse alarm PV string channel 2 current reverse alarm PV string channel 1 current reverse alarm Reserve Reserve Reserve Reserve Reserve Reserve Reserve Reserve PV string channel 24 current unbalance alarm PV string channel 23 current unbalance alarm PV string channel 22 current unbalance alarm PV string channel 21 current unbalance alarm PV string channel 20 current unbalance alarm PV string channel 19 current unbalance alarm PV string channel 18 current unbalance alarm PV string channel 17 current unbalance alarm PV string channel 16 current unbalance alarm PV string channel 15 current unbalance alarm PV string channel 14 current unbalance alarm PV string channel 13 current unbalance alarm PV string channel 12 current unbalance alarm PV string channel 11 current unbalance alarm PV string channel 10 current unbalance alarm PV string channel 9 current unbalance alarm PV string channel 8 current unbalance alarm PV string channel 7 current unbalance alarm PV string channel 6 current unbalance alarm -15- 0x0193 0x0194 0x0195 0x0196 0x0197 0x0198 0x0199 0x019A 0x019B 0x019C 0x019D 0x019E 0x019F PV string channel 5 current unbalance alarm PV string channel 4 current unbalance alarm PV string channel 3 current unbalance alarm PV string channel 2 current unbalance alarm PV string channel 1 current unbalance alarm Reserve Reserve Reserve Reserve Reserve Reserve Reserve Reserve 60x104D definition Bit0 PV string channel 1 current Zero value state Bit1 PV string channel 1 current low value state Bit2 PV string channel 1 current high value state Bit3 PV string channel 2 current Zero value state Bit4 PV string channel 2 current low value state Bit5 PV string channel 2 current high value state Bit6 PV string channel 3 current Zero value state Bit7 PV string channel 3 current low value state Bit8 PV string channel 3 current high value state Bit9 PV string channel 4 current Zero value state Bit10 PV string channel 4 current low value state Bit11 PV string channel 4 current high value state Bit12 PV string channel 5 current Zero value state Bit13 PV string channel 5 current low value state Bit14 PV string channel 5 current high value state Bit15 reserve 70x104E definition Bit0 PV string channel 6 current Zero value state Bit1 PV string channel 6 current low value state Bit2 PV string channel 6 current high value state Bit3 PV string channel 7 current Zero value state Bit4 PV string channel 7 current low value state Bit5 PV string channel 7 current high value state Bit6 PV string channel 8 current Zero value state Bit7 PV string channel 8 current low value state Bit8 PV string channel 8 current high value state Bit9 PV string channel 9 current Zero value state Bit10 PV string channel 9 current low value state -16- Bit11 Bit12 Bit13 Bit14 Bit15 PV string channel 9 current high value state PV string channel 10 current Zero value state PV string channel 10 current low value state PV string channel 10 current high value state reserve 80x104F definition Bit0 PV string channel 11 current Zero value state Bit1 PV string channel 11 current low value state Bit2 PV string channel 11 current high value state Bit3 PV string channel 12 current Zero value state Bit4 PV string channel 12 current low value state Bit5 PV string channel 12 current high value state Bit6 PV string channel 13 current Zero value state Bit7 PV string channel 13 current low value state Bit8 PV string channel 13 current high value state Bit9 PV string channel 14 current Zero value state Bit10 PV string channel 14 current low value state Bit11 PV string channel 14 current high value state Bit12 PV string channel 15 current Zero value state Bit13 PV string channel 15 current low value state Bit14 PV string channel 15 current high value state Bit15 reserve 90x1050 definition Bit0 PV string channel 16 current Zero value state Bit1 PV string channel 16 current low value state Bit2 PV string channel 16 current high value state Bit3 PV string channel 17 current Zero value state Bit4 PV string channel 17 current low value state Bit5 PV string channel 17 current high value state Bit6 PV string channel 18 current Zero value state Bit7 PV string channel 18 current low value state Bit8 PV string channel 18 current high value state Bit9 PV string channel 19 current Zero value state Bit10 PV string channel 19 current low value state Bit11 PV string channel 19 current high value state Bit12 PV string channel 20 current Zero value state Bit13 PV string channel 20 current low value state Bit14 PV string channel 20 current high value state Bit15 reserve 100x1051 definition Bit0 PV string channel 21 current Zero value state Bit1 PV string channel 21 current low value state Bit2 PV string channel 21 current high value state -17- Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9 Bit10 Bit11 Bit12 Bit13 Bit14 Bit15 PV string channel 22 current Zero value state PV string channel 22 current low value state PV string channel 22 current high value state PV string channel 23 current Zero value state PV string channel 23 current low value state PV string channel 23 current high value state PV string channel 24 current Zero value state PV string channel 24 current low value state PV string channel 24 current high value state Reserve Reserve Reserve Reserve 110x1052 definition Bit0 Voltage low value/high value state Bit1 Reserve Bit2 Reserve Bit3 Reserve Bit4 Reserve Bit5 Reserve Bit6 Reserve Bit7 Reserve Bit8 Switch 1 state Bit9 Switch 2 state Bit10 Switch 3 state Bit11 Reserve Bit12 Reserve Bit13 Reserve Bit14 Reserve Bit15 Reserve 120x1053 definition Bit0 PV string channel 24 current reverse alarm Bit1 PV string channel 23 current reverse alarm Bit2 PV string channel 22 current reverse alarm Bit3 PV string channel 21 current reverse alarm Bit4 PV string channel 20 current reverse alarm Bit5 PV string channel 19 current reverse alarm Bit6 PV string channel 18 current reverse alarm Bit7 PV string channel 17 current reverse alarm Bit8 PV string channel 16 current reverse alarm Bit9 PV string channel 15 current reverse alarm Bit10 PV string channel 14 current reverse alarm Bit11 PV string channel 13 current reverse alarm Bit12 PV string channel 12 current reverse alarm -18- Bit13 PV string channel 11 current reverse alarm Bit14 PV string channel 10 current reverse alarm Bit15 PV string channel 9 current reverse alarm 130x1054 definition Bit0 PV string channel 8 current reverse alarm Bit1 PV string channel 7 current reverse alarm Bit2 PV string channel 6 current reverse alarm Bit3 PV string channel 5 current reverse alarm Bit4 PV string channel 4 current reverse alarm Bit5 PV string channel 3 current reverse alarm Bit6 PV string channel 2 current reverse alarm Bit7 PV string channel 1 current reverse alarm Bit8 Reserve Bit9 Reserve Bit10 Reserve Bit11 Reserve Bit12 Reserve Bit13 Reserve Bit14 Reserve Bit15 Reserve 140x1055 definition Bit0 PV string channel 24 current unbalance alarm Bit1 PV string channel 23 current unbalance alarm Bit2 PV string channel 22 current unbalance alarm Bit3 PV string channel 21 current unbalance alarm Bit4 PV string channel 20 current unbalance alarm Bit5 PV string channel 19 current unbalance alarm Bit6 PV string channel 18 current unbalance alarm Bit7 PV string channel 17 current unbalance alarm Bit8 PV string channel 16 current unbalance alarm Bit9 PV string channel 15 current unbalance alarm Bit10 PV string channel 14 current unbalance alarm Bit11 PV string channel 13 current unbalance alarm Bit12 PV string channel 12 current unbalance alarm Bit13 PV string channel 11 current unbalance alarm Bit14 PV string channel 10 current unbalance alarm Bit15 PV string channel 9 current unbalance alarm 150x1056 definition Bit0 PV string channel 8 current unbalance alarm Bit1 PV string channel 7 current unbalance alarm Bit2 PV string channel 6 current unbalance alarm Bit3 PV string channel 5 current unbalance alarm Bit4 PV string channel 4 current unbalance alarm -19- Bit5 Bit6 Bit7 Bit8 Bit9 Bit10 Bit11 Bit12 Bit13 Bit14 Bit15 PV string channel 3 current unbalance alarm PV string channel 2 current unbalance alarm PV string channel 1 current unbalance alarm Reserve Reserve Reserve Reserve Reserve Reserve Reserve Reserve 11.Packaging and shipping Packing: The product is packaged by carton. The content includes: a PV current combiner box monitor, a instructions, a certificate. Transport: No severe vibration and impact in transportation. Preservation: Place in a well ventilated place, and avoid high temperature. Avoid rain and snow invasion. 12.Quality Assurance Warranty period:12 months. Please take care of the invoice. It will be need in warranty period. Quality guarantee note: We will repair or replace the product for free in the quality guarantee period. The substandard products should return to us after replace. The customer shall give us reasonable time to repair. We have right to refuse quality assurance under the following situation: Damage in transport Incorrect installation Incorrect modification Incorrect use Harsh environment Use the product out of the rang or beyond the relevant standard Man-made destruction 13.Safety operation at the scene Please operate follow this step before your inspection to ensure your safety. 1. turn-off the circuit breaker. 2. turn-off the fuse seat. -20- WARNING All the terminals of the DC circuit breaker are still charged when the circuit breaker is turned off. All the terminals of the fuse seats are still charged when the fuse seats are turned off. Make sure the circuit breaker and fuse seats are all turned off when you work! -21-Microsoft Word 2019