Mitsubishi Machine-Room-Less Overload Weighing Plate KCZ-900A

Mitsubishi Machine-Room-Less Overload Weighing Plate KCZ-900A is used in Mitsubishi elevator load weighing and overload detection systems.

In the elevator spare parts market, this part may also be called:

• Mitsubishi Elevator Overload Weighing PCB
• Mitsubishi Elevator Overload Weighing Board
• Mitsubishi Elevator Weighing PCB
• Mitsubishi MRL Overload Weighing Board
• Mitsubishi Elevator Load Weighing Board

This board is usually related to the elevator load weighing circuit, where passenger load information is detected and processed before being sent to the elevator control system. When the elevator detects overload, abnormal load signal, or unstable weighing response, technicians may inspect this board together with the load sensor and related wiring.

KCZ Series Model References

This page can naturally cover the following model references:

• KCZ-900A
• KCZ-901A
• Mitsubishi Elevator Overload Weighing Board
• Mitsubishi Elevator Overload Weighing PCB
• Mitsubishi Elevator Weighing PCB

Several public supplier pages list KCZ-900A and KCZ-901A together as Mitsubishi elevator overload weighing board models. These two numbers are useful for search and quotation confirmation, but the final replacement should still be checked against the original board label and elevator configuration.

What This Board Is Usually Connected With

An overload weighing board does not work alone.

In real elevator maintenance, technicians may check KCZ-900A together with:

• load weighing sensor
• car frame weighing device
• signal cable
• controller input terminal
• weighing calibration setting
• overload buzzer or indicator circuit
• machine-room-less control cabinet wiring

If the load signal is unstable, the cause may be the board, sensor, wiring, or calibration condition. Replacing the board without checking the weighing sensor may not solve the fault.

Common Site Symptoms

KCZ-900A may be inspected when the elevator shows symptoms such as:

• false overload warning
• overload signal not responding
• unstable load display
• elevator refusing to start under normal load
• no overload alarm under heavy load
• abnormal weighing calibration result
• intermittent load signal fault

These symptoms are especially important because load weighing is related to passenger safety and elevator control logic. If the elevator incorrectly detects overload, normal operation may be affected. If overload detection fails, the elevator may not respond correctly under excessive load.

Confirmation Before Supply

For accurate replacement, buyers should provide:

• clear photo of the KCZ-900A label
• front and back photos of the PCB
• whether KCZ-901A appears on the old board or system document
• connector and wiring photos
• installation position in the MRL control cabinet
• load sensor model or weighing device photo if available
• fault description from the maintenance technician

For older Mitsubishi machine-room-less elevators, the fastest way to confirm the correct part is to match the old board marking and connector layout.

Maintenance Note

After replacing an overload weighing board, technicians may need to check the load signal and perform weighing calibration according to the elevator maintenance procedure.

If the weighing circuit is not calibrated correctly, the elevator may continue to show overload warnings even after the board has been replaced. For this reason, KCZ-900A should be handled as part of the complete load weighing system, not as an isolated PCB.