FGH4K-100G-90G-NG/20P Heavy-Duty Encoder Replacement Solution

The FGH4K-100G-90G-NG/20P is a classic heavy-duty incremental encoder widely used in metallurgy, rolling mills, and other high-vibration industrial applications. As the original model becomes increasingly hard to source, we provide a full 1:1 parameter-matched replacement solution. Our engineering team precisely replicates the electrical and mechanical parameters — including output signal type, shaft dimensions, pulse resolution, and mounting structure — ensuring seamless installation and operation without any modifications to the user’s existing setup. This replacement option is designed to help customers overcome sourcing challenges and reduce equipment downtime. With an efficient production process and optimized supply chain, we are able to maintain a short delivery period for non-standard customized orders, meeting the urgent needs of global industrial clients.

From a performance standpoint, the FGH4K-100G-90G-NG/20P encoder is valued for its exceptional reliability in demanding environments. It provides accurate feedback under severe temperature variations, heavy vibration, and dust exposure — conditions typical of steel plants and metallurgical automation systems. The encoder’s robust housing and stable output signal make it an ideal choice for long-term operation in continuous production environments. Our replacement version fully preserves these features while allowing for tailored customization based on user applications, such as different cable lengths, connector types, and mechanical interfaces.

Our heavy-duty encoder replacement solutions have been successfully deployed in various regions including the Middle East, Russia, Southeast Asia, Indonesia, and South America. These projects demonstrate the global reliability and practical performance of our encoders, offering a dependable path forward for users struggling to find original models.

Replacement solution reference image.

Incremental Encoder Specifications (FG(H)4 Series)

Construction type

• Solid shaft B5 (flange) or B35 (flange + foot)
• H = Hollow shaft
• HJ = Hollow shaft (isolated)

Series

[Series information not explicitly listed in the image]

Electrical connection

• R = Terminal strip in a terminal box / 12-pole round connector Bundy
• C = Cable outlet / FCC connector in a terminal box
• KK = Second terminal box (available output signals on request)

Pulses per rotation

• Square pulses: 500, 600, 1000, 1024, 1200, 1300, 2000, 2048, 2400, 2500, ...1 million
• Sinus signals: 500, 600, 1000, 1024, 1200, 1300, 2500
• Other pulse ratios on request

Signal output

• Basic version: 0°, 90°, each with inverted signals
• - = without reference pulse
• NG = Reference pulse with inverted signal

Additional options signal outputs (see p.11)

• 2F = Option 2F; B2 = Option B2
• B = Option B; B3 = Option B3

Overspeed switch (see p.11)

• - = without option S
• S = Option S

Shaft