HSD352048KB4 Incremental Encoder with 1-1/4" Bore and Differential AB Output

For HSD352048KB4, EncoderWorks can provide a custom compatible replacement solution for heavy-duty hollow-shaft incremental feedback systems where the key checks are 2048 PPR counter frequency margin, 7272 differential AB-only signal matching, 1-1/4" bore fit, and 4.5" C-Face tether preload. This version should not be treated like an isolated-bore or ABZ encoder, because the bore is non-isolated and the output provides A/A- and B/B- only, with no Z index channel. Typical production lead time: 15 working days.

This model belongs to the HSD35 heavy-duty optical incremental encoder series. In the HSD352048KB4 configuration, the encoder provides 2048 pulses per revolution, a 1-1/4" non-isolated hollow bore, a 4.5" C-Face tether with 3/8" bolt, and differential AB output using the 7272 driver format with 5–26 VDC input and 5–26 V output. Replacement work should focus on receiver compatibility, A/A- and B/B- wiring, quadrature decoding mode, shaft clamping, tether movement, and 10-pin connector assignment.

System Limits

The main electrical limit is differential AB compatibility. The controller input must accept 5–26 V differential A/A- and B/B- signals. If the system expects open collector, 4469 5–15 V output, single-ended ABZ, or a Z index pulse, the encoder may count but still fail on reference, homing, or input-threshold behavior.

The second limit is counter frequency margin. At 2048 PPR, the real input load depends on shaft speed and x1, x2, or x4 quadrature decoding. The counter should be checked against the 200 kHz data frequency limit, A/B phase tolerance, and direction logic.

The mechanical limit is the 1-1/4" hollow-shaft clamp and 4.5" C-Face tether. The bore must fit the shaft without forcing the clamp, and the tether should stop housing rotation without side-loading the bearings. Because this bore is not electrically isolated, grounding and shaft-current conditions should also be reviewed.

Wiring & Installation

Before removing the existing encoder, record the 10-pin connector wiring for Common, Signal A, Signal B, Vcc, Signal A_, and Signal B_. Confirm that the controller expects 7272 differential AB-only feedback rather than differential ABZ, open collector, 4469 output, or dual isolated feedback.

After installation, rotate the shaft slowly and confirm that A leads B for clockwise shaft rotation when viewed from the clamp end. Then check pulse count, direction trend, tether movement, and counter stability at the required operating speed.

Custom Compatible Solution

EncoderWorks can configure the replacement around the installed drive and counter system:

• Match 2048 PPR differential AB output, 7272 driver behavior, and 5–26 V receiver compatibility
• Adapt the 1-1/4" non-isolated hollow bore, clamp fit, 4.5" C-Face tether, and 3/8" bolt mounting
• Verify A/B phase direction, quadrature decoding mode, counter scaling, and frequency margin
• Review 10-pin connector wiring, shield grounding, cable routing, shaft grounding, and tether preload

Key Data