The OMRON PWB (KP100 POWER) 1177828-8D is an electronic monitoring and control board used in OMRON KP100L, KP125L, and KP150L three-phase photovoltaic inverters.

This board performs essential supervision, monitoring, and protection functions within the inverter. Through its integrated signal-conditioning circuits, relays, power supply components, and communication interfaces, it collects operational data from various inverter subsystems and communicates this information to the main control system.

The KP100 POWER Monitoring Board continuously supervises inverter operating conditions, helping ensure safe, stable, and reliable photovoltaic energy production.

⚙️ Technical Specifications

• Manufacturer: OMRON
• Board Model: KP100 POWER
• Part Number: 1177828-8D
• Type: Monitoring Board / Power Monitoring Board
• Application: Three-phase grid-tied photovoltaic inverters
• Compatibility:
  • OMRON KP100L
  • OMRON KP125L
  • OMRON KP150L
• Signal acquisition circuits
• Integrated control relays
• Internal auxiliary power supply circuitry
• Interfaces for sensors and power boards
• Inverter status monitoring system
• Alarm and protection management
• Internal inverter installation

🔧 Main Functions

Operating Parameter Monitoring

Continuously monitors:

• DC bus voltage
• Input and output currents
• Power module status
• Internal temperatures
• Grid parameters

Alarm Management

Detects abnormal operating conditions and reports faults to the inverter's main controller.

Auxiliary Power Supply Supervision

Verifies the correct presence and operation of internal auxiliary voltages required by the inverter.

Internal Relay Management

Controls the activation and deactivation of auxiliary and protection circuits.

Communication with Other Boards

Acts as a monitoring interface between:

• Logic Board
• Power Boards
• Driver Boards
• Display and HMI systems

🔌 Purpose and Operation

The KP100 POWER Board is designed to monitor and control the proper operation of the entire inverter system.

Its primary functions include:

• Detection of operating anomalies
• Supervision of energy production
• Monitoring of internal power supplies
• Management of electronic protection systems
• Reporting of inverter operating status
• Continuous monitoring of electrical parameters

Without this board, the inverter may fail to start or may be unable to safely manage operating and protection conditions.

🧩 Role Within the Inverter System

Inside OMRON KP Series inverters, the board serves as:

• Central monitoring system
• Operational condition supervisor
• Interface between sensors and controller
• Alarm management unit
• Auxiliary power supply controller

It works closely with:

• Main Logic Board
• MPPT Boards
• DC Power Boards
• IGBT Modules
• Communication and Display Systems

⚠️ Typical Faults and Symptoms

Auxiliary Power Supply Failure

Symptoms:

❗ Inverter remains off
❗ Startup failure
❗ Continuous reboot cycles

Defective Relays

Symptoms:

❗ Incorrect switching operations
❗ Operational lockups
❗ Initialization errors

Aging Capacitors

Symptoms:

❗ Operational instability
❗ Random restarts
❗ Intermittent faults

Monitoring Circuit Failure

Symptoms:

❗ Incorrect voltage measurements
❗ Incorrect current readings
❗ False alarms
❗ Reduced power production

Oxidized or Damaged Connectors

Symptoms:

❗ Unstable communication
❗ Random faults
❗ Intermittent operation

🚨 Possible Associated Errors

When faults occur on the monitoring board, the inverter may display errors such as:

• Internal Communication Error
• Power Monitoring Fault
• Auxiliary Power Supply Error
• Voltage Measurement Error
• Current Measurement Error
• Hardware Fault
• Internal Board Failure
• System Initialization Error
• Temperature Sensor Fault
• Relay Control Error
• Monitoring Circuit Fault

In some cases, the inverter may automatically enter protection mode to prevent damage to power components and associated circuitry.

🛠 Applications

• Repair of OMRON KP Series photovoltaic inverters
• Replacement of faulty monitoring boards
• Restoration of inverter supervision functions
• Troubleshooting communication and measurement issues
• Industrial photovoltaic system maintenance
• Refurbishment of photovoltaic inverters

💡 Advantages of the Original OMRON Board

✔ Perfect compatibility with KP Series inverters
✔ Reliable monitoring of critical operating parameters
✔ High operational stability
✔ Full integration with original OMRON firmware
✔ Advanced inverter protection functions
✔ Reduced system downtime
✔ Cost-effective repair solution

🔄 Compatibility

Compatible with:

• OMRON KP100L
• OMRON KP125L
• OMRON KP150L

Always verify the board part number (1177828-8D) and hardware revision before replacement.

🟢 Summary

The OMRON PWB (KP100 POWER) 1177828-8D Monitoring Board is a critical supervision and control module used in OMRON KP100L, KP125L, and KP150L photovoltaic inverters. Responsible for monitoring electrical parameters, managing alarms, supervising auxiliary power supplies, and coordinating communication between inverter subsystems, it plays a vital role in ensuring safe, stable, and efficient operation of the photovoltaic system.