EncoderWorks develops the FGH6KK-5000G-90G-NG-V-J/50P custom compatible replacement solution around high-count heavy-duty incremental speed feedback where 5000 PPR scaling, A/B 90° quadrature, inverted signal pairs, NG reference-pulse behavior, V electronic pulse-doubling behavior, reduced rotational-frequency modulation, dual terminal-box wiring, and Ø50 H7 hollow-shaft fit must remain stable at the installed counter. The failure boundary is not a fieldbus telegram or an absolute position word, but missed high-rate edges, phase jitter, wrong electronic multiplication, reference mismatch, output-driver overload, shield noise, shaft-current exposure, and hollow-shaft movement. Typical production lead time: 15 working days.
This model is used where a large hollow-shaft incremental encoder is mounted directly on a heavy machine shaft for speed measurement, direction recognition, indexing, and high-resolution process synchronization. A compatible replacement must preserve the 5000 pulses per revolution, 90° phase relationship, inverted A/B/N signal requirement, V option behavior, J option behavior, dual terminal-box assignment, output level, 50P bore geometry, housing ground path, and heavy-duty mounting boundary.
System Limits
The first system boundary is the 5000 PPR counter interface and V electronic pulse-doubling requirement. FGH6KK-5000G-90G-NG-V-J/50P must be checked against maximum input frequency, edge evaluation, A/B direction logic, reference-pulse width, inverted-signal use, output-driver type, supply level, cable length, V option interpretation, and the reduced rotational-frequency modulation requirement. If the replacement is supplied as 4096 PPR, 2500 PPR, 1024 PPR, or without the correct V and reference behavior, the controller may still count pulses while speed scaling, travel calculation, direction detection, or reference repeatability becomes unreliable. At 5000 PPR, counter margin is especially important because high shaft speed can turn a wiring or driver mismatch into missed counts.
The second boundary is the KK dual-terminal and Ø50 hollow-shaft installation. Each terminal box, 0 V reference, shield path, cable gland, housing bond, and PE continuity must be treated as part of the measurement system. A correct high-count encoder can still fail if one terminal box has a weak shield connection, signal cables run beside brake or drive wiring, duplicated signal paths are grounded differently, or the Ø50 H7 hollow shaft is fitted with eccentric load. The 50P bore, keyway fit, axial movement, torque reaction, vibration, bearing load, and optional shaft-current isolation requirement should be checked together.
Wiring & Installation
Before replacement, confirm the full installed model code, 5000 PPR requirement, A/B 90° relationship, NG reference-pulse use, inverted output requirement, V option requirement, J option requirement, output circuit, supply voltage, maximum shaft speed, counter frequency margin, dual terminal-box layout, cable-entry direction, shield termination method, and Ø50 H7 hollow-shaft dimension. This version should not be inferred from lower-resolution FGH6KK variants because the high pulse count and V option change edge density, counter loading, scaling logic, and commissioning margins.
During installation, verify A, B, reference, inverted channels, supply, 0 V, shield, housing ground, and both terminal-box paths before powering the system. Keep signal cables away from motor, brake, SCR, and VFD wiring, and do not use the cable shield as a load-carrying ground conductor. The hollow shaft must seat concentrically on the machine shaft, and the torque restraint should prevent encoder-body movement without forcing the bearing system. Eccentric preload can become phase jitter, bearing wear, unstable reference repeatability, or high-speed count loss.
Custom Compatible Solution
- Match 5000 PPR incremental feedback, A/B 90° quadrature, inverted A/B/N signals, NG reference behavior, V electronic pulse-doubling behavior, and controller counter expectations
- Preserve dual terminal-box wiring, shield continuity, output-driver compatibility, supply reference, J option signal-stability requirement, and grounding boundary
- Adapt the Ø50 H7 hollow shaft, keyway fit, heavy-duty housing, bearing-load boundary, torque restraint, cable entry, and machine-side mounting geometry
- Review maximum shaft speed, counter frequency margin, V option scaling, EMC exposure, shaft-current risk, runout, vibration, reference repeatability, and commissioning checks before shipment
Key Data
| Item | Data |
|---|---|
| Model | FGH6KK-5000G-90G-NG-V-J/50P |
| Encoder type | Heavy-duty large hollow-shaft incremental encoder |
| Feedback type | Incremental A/B with reference pulse |
| Pulse count | 5000 PPR |
| Phase relationship | A/B, 90° quadrature |
| Inverted signals | G, inverted output signal boundary |
| Reference pulse | NG reference pulse with inverted signal |
| Electronic option | V, electronic pulse-doubling boundary |
| Signal quality option | J, reduced rotational-frequency modulation boundary |
| Overspeed option | Not included in this model code |
| Connection | KK, dual terminal boxes with terminal strips |
| Shaft interface | 50P, Ø50 H7 hollow shaft with keyway |
| Output circuit | HTL / TTL or installed output level requires confirmation |
| Supply voltage | 12–30 VDC, installed version requires confirmation |
| Protection boundary | Up to IP66, sealing and speed limit require installed-version confirmation |
| Key system checks | 5000 PPR scaling, high edge rate, counter frequency, V option, A/B direction, NG reference, inverted channels, shield grounding |
| Key mechanical checks | Ø50 bore fit, keyway fit, runout, axial movement, torque restraint, vibration, bearing load, shaft-current isolation requirement |
