FGH40KK-1200G-90G-NG/20P Incremental Encoder Custom Solution

The FGH40KK-1200G-90G-NG/20P can be supported with a custom compatible encoder solution for maintenance service, retrofit implementation, replacement planning, and upgrade projects. Where the installed machine uses a hollow-shaft feedback arrangement with established signal and wiring logic, a project-specific compatible version can be developed with a standard production lead time of 30 working days.

Technical Overview of the FGH40KK-1200G-90G-NG/20P Encoder

The FGH40KK-1200G-90G-NG/20P is an incremental hollow shaft encoder intended for rotary motion measurement in industrial drive and feedback applications. The current FGH 40 manual identifies this family as an Incremental Hollow Shaft Encoder, and the electrical data confirms 1200 as one of the standard square-wave pulse values. In this model code, 1200G defines a 1200 ppr output structure, while 90G / NG indicates a quadrature-style signal arrangement with reference pulse logic. The same manual specifies 12–30 V DC supply, HTL as the standard output level, optional 5 V TTL / RS422-compatible output, and a maximum output frequency of 200 kHz.

In contrast to higher-density variants such as 4096 or 8192 ppr versions, the 1200 ppr configuration is more oriented toward installations where the control side requires a moderate pulse count without moving into the special high-resolution range. The manual also defines standard square-wave timing characteristics of 1:1 ±3% duty cycle and 90° ±3% phase displacement, which makes this version suitable for systems that depend on predictable incremental timing but do not require unusually high pulse density. The FGH 40 documentation further distinguishes between one terminal box and two terminal boxes (redundant version), so the KK configuration remains a relevant integration feature rather than a purely descriptive suffix.

Industrial Integration Considerations

For this model, one practical advantage in retrofit work is that a 1200 ppr signal structure may fit existing controllers or speed-monitoring circuits more easily than higher pulse-count versions. Even so, replacement planning should still confirm input voltage compatibility, pulse-processing capability, shielding continuity, and reference pulse handling on the receiving side before installation. Keeping the same nominal pulse count does not automatically guarantee the same field behavior if grounding, shielding, or signal input conditions have changed.

The FGH 40 manual also makes it clear that installation practice has a direct impact on operational reliability. Proper machine grounding, correct shield implementation, and adequate separation from inverters, motors, brakes, and contactors should all be reviewed before commissioning. The manual additionally notes that inductive loads such as relays or contactors should be suppressed where required, and that mechanical shock or binding during installation can damage the bearing system. These points are especially relevant when replacing an encoder in an older machine where surrounding installation conditions may already be less than ideal.

Custom Compatible Encoder Solution

For the FGH40KK-1200G-90G-NG/20P, a custom compatible encoder solution can be engineered to match the original machine interface as closely as possible. The compatible version can be configured around the required hollow-shaft arrangement, 1200 ppr output, output level, signal format, terminal-box concept, and installation logic so that mechanical and electrical modification remains limited during replacement or upgrade work.

This compatibility-focused approach is particularly useful where the machine owner wants to preserve the original control behavior and avoid unnecessary redesign of the feedback section. By matching pulse structure, shaft-side installation, and field wiring logic together, the replacement process can remain more predictable and better aligned with the existing equipment architecture.

Lead Time and Custom Development

Typical production lead time: 30 working days.

Before production, the engineering review should confirm the pulse count, supply voltage, output type, signal format, shaft arrangement, terminal-box layout, controller input expectations, and field installation conditions. Protection and sealing requirements should also be checked in advance, since the latest manual states that the FGH 40 family supports IP65 / IP66 depending on configuration, and that sealing conditions influence permissible speed and breakaway torque.

Typical Technical Parameters