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Installation & Application（安装应用） The NKP-LJ-04 SPD communication module can be used in conjunction with a power surge protector during installation. It 采用 a DIN35 rail mounting method and can be installed in power distribution boxes and various standard cabinets. When wiring, the working power supply terminals must be connected to the protected side of the AC or DC power surge protector. The sampling current transformer should be connected in series to the down conductor of the surge protector, and the remote signaling terminals should be connected to the remote signaling contacts of the power surge protector. The RS-485 serial communication terminals are to be connected to the 485 bus of a remote intelligent management unit or an integrated automation system (background host computer). The digital display of the NKP-LJ-04 SPD communication module shows the number of lightning strikes. Operations such as setting the communication address and rate, as well as clearing the count, can be performed via the buttons below the digital display.
Product Dimension Drawing
Terminal Definitions:
1 — Power Supply L/+
2 — Power Supply N/-
3 — Current Transformer Output Terminal 1 (Polarity-independent)
4 — Current Transformer Output Terminal 2 (Polarity-independent)
5 — Remote Signal (YX) Contact Terminal 1 of Power Surge Protector (Polarity-independent)
6 — Remote Signal (YX) Contact Terminal 2 of Power Surge Protector (Polarity-independent)
7 — Current Transformer Output Terminal 1 (Polarity-independent)
8 — Current Transformer Output Terminal 2 (Polarity-independent)
Product Wiring Diagram
Technical Parameters（技术参数） Operating Power Supply:
AC 100V-240V, 2W, AC-powered (must be connected to the protected side of surge protector)
Operating Temperature:
-5°C to +40°C (Storage Temperature: -40°C to +70°C)
Sampling Method:
Dedicated current transformer, counts lightning strikes via current detection
Lightning Impulse Current:
1.2kA to 160kA (8/20μs waveform)
Display:
2-digit 0.30-inch high-brightness red LED digital tubes
Device Address:
Hexadecimal 01H-FFH (Decimal 1-255)
Default: 01H (configurable via buttons, alignable with surge protector ID)
Baud Rate:
Selectable: 9600/4800/2400/1200/600 bit/s
Default: 9600 bit/s (configurable via buttons)
Communication:
RS-485 interface, simplified MODBUS-RTU protocol for host/management system communication
Maximum Count:
99 strikes (auto-resets to 01 after reaching maximum)
Data Retention:
Non-volatile memory, retains data for 10 years during power outage
Mounting:
DIN35 rail mounting
Dimensions:
91mm × 36mm × 65mm
Ordering and Model Selection（订货选型） *Please send the inquiry email containing specific product requirements (such as model, quantity, technical parameters, etc.) to the designated email address salina@kejia.com.
（请将包含具体产品需求（如型号、数量、技术参数等）的询价邮件发送至指定邮箱 salina@kejia.com）
Download
| File name | Product type | Download |
|---|---|---|
| NKP-LJ-04 SPD 通讯模块PDF文档 | 说明手册 | Download |
