EncoderWorks develops custom compatible replacement solutions for OG 73 UN 1024 and OG 73 RN 1024 around incremental feedback where 1024 PPR scaling, A/B/C channel logic, complementary inverted signals, 11-pin connector continuity, Ø11 mm solid-shaft coupling, compact housing fit, and hazardous-area installation limits must remain matched to the installed counter. The failure boundary is not only signal compatibility, but housing clearance, connector access, shaft alignment, wrong output level, missed high-speed pulses, shifted C reference timing, shield noise, and approval-scope mismatch. Typical production lead time: 15 working days.
These two models are used where the controller reads speed, direction, and reference position from an incremental encoder with A, B, and C channels plus inverted outputs. A compatible replacement should preserve the 1024 pulses per revolution, 90° quadrature relationship, reference-pulse behavior, output level, 11-pin connector assignment, Ø11 mm shaft interface, IP sealing, housing envelope, and the installed hazardous-area boundary.
System Limits
The first system boundary is the counter input and signal timing. OG 73 UN 1024 and OG 73 RN 1024 must be checked against the controller’s edge evaluation mode, maximum input frequency, expected A/B direction, C reference-pulse use, complementary signal requirement, supply level, output-driver type, and receiver noise margin. If the replacement is supplied with the wrong PPR, changed A/B phase relationship, missing inverted channels, incorrect C pulse behavior, or a different output level, the machine may still count motion while speed scaling, homing, direction logic, or reference repeatability becomes unreliable.
The second boundary is the compact housing, 11-pin connector, EMC path, and solid-shaft installation. The housing envelope must be checked for radial clearance, rear connector space, cable bend radius, mounting depth, guard clearance, and shaft-coupling access before production. A correct 1024 PPR encoder can still fail if the connector pin assignment is shifted, the shield is grounded through a high-impedance path, the cable runs beside brake or inverter wiring, or the Ø11 mm shaft is loaded by a misaligned coupling. IP sealing, hazardous-area suitability, and housing clearance should be reviewed together.
UN and RN Version Check
OG 73 UN 1024 and OG 73 RN 1024 should not be treated as interchangeable only because the main feedback data is similar. The installed UN or RN version must be confirmed from the old nameplate, connector orientation, mounting position, cable route, housing clearance, and any site-specific approval requirement. If the UN/RN difference affects connector direction, enclosure detail, mounting access, or installed drawing dimensions, the replacement must follow the actual machine version instead of a generic outline.
Wiring & Installation
Before replacement, confirm the full installed model code, 1024 PPR requirement, A/B/C signal structure, inverted-channel use, output level, supply voltage, connector pin assignment, cable shield termination, shaft diameter, coupling type, housing diameter, mounting depth, connector direction, and available installation space. These models should not be selected only by resolution because the controller depends on pulse timing, output circuit, connector continuity, and reference-channel behavior.
During installation, verify the 11-pin connector mapping before powering the system. Keep the feedback cable away from motor, brake, SCR, and VFD wiring, and avoid using the shield as a load-carrying ground conductor. The Ø11 mm solid shaft should be coupled concentrically, without axial preload or radial side force. Any coupling eccentricity can appear as phase jitter, bearing stress, reference-pulse repeatability loss, or intermittent count errors at higher speed. The compact housing envelope should be checked against brackets, guards, cable routing, and any hazardous-area installation approval used on the original machine.
Custom Compatible Solution
- Match 1024 PPR incremental feedback, A/B/C channels, inverted signal logic, reference-pulse behavior, and controller counter expectations
- Preserve 11-pin connector continuity, output-driver compatibility, supply reference, shield path, and grounding boundary
- Adapt the compact housing envelope, Ø11 mm solid shaft, coupling interface, mounting clearance, connector access, and IP sealing requirement
- Confirm UN/RN installed-version details, counter frequency margin, phase accuracy, duty cycle, reference timing, EMC exposure, shaft load, and hazardous-area suitability before shipment
Key Data
| Item | Data |
|---|---|
| Models | OG 73 UN 1024 / OG 73 RN 1024 |
| Encoder type | Incremental solid-shaft encoder |
| Resolution | 1024 PPR |
| Signal channels | A, B, C with complementary inverted signals |
| Signal format | Quadrature with reference pulse |
| Phase shift | 90° nominal, installed tolerance requires confirmation |
| Duty cycle | 40–60% boundary |
| Output frequency | Up to 120 kHz, counter margin must be checked |
| Output level | TTL / HTL variant requires confirmation |
| Shaft type | Solid shaft |
| Shaft diameter | Ø11 mm |
| Connection | 11-pin connector |
| Housing boundary | Compact housing envelope, dimensions require confirmation |
| Protection rating | IP66 sealing boundary |
| Operating temperature | -30…+85 °C installed-version boundary |
| Maximum speed | 5600 rpm application check required |
| Shaft load | 50 N axial / 80 N radial boundary |
| Version check | UN / RN installed configuration requires confirmation |
| Hazardous-area boundary | Equipment category and temperature class must match the installed approval scope |
| Key replacement checks | PPR, output level, A/B direction, C reference pulse, inverted channels, connector pinout, shield grounding, housing clearance, shaft coupling, hazardous-area suitability |
