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F14

Servo Duty Encoder for Stepper & Small Servo Motors

The Dynapar Series F14 is a compact commutating encoder designed for stepper and small servo motor applications. Its hollow-shaft construction provides simple installation without damaging the mating shaft, while the available high-resolution options support smooth motor control at low speeds.

Key Features

  • Non-marring hollow-shaft design allows easy installation and incorporates a flex-tether mounting arrangement.
  • Available with resolutions of up to 5000 PPR, enabling smooth low-speed motor control.
  • Operating temperatures up to +120°C help prevent encoder temperature limitations from restricting motor performance.

STANDARD OPERATING CHARACTERISTICS

Code
Incremental encoder with an optional commutation function, using optical sensing.
Resolution
  • 1000 to 5000 PPR for incremental operation.
  • Commutation channels are available for 4-, 6-, and 8-pole motors.
Accuracy
  • Incremental: ±2.5 arc-min maximum, edge-to-any-edge.
  • Commutation: ±6 arc-min maximum.
Signal Phasing
For counter-clockwise (CCW) rotation of the motor shaft, viewed from the encoder cover:
  • A leads B by 90°
  • U leads V leads W by 120°
The minimum separation between the A and B signal edges is 45°.
Index-to-U Channel
The centre of the mechanical index pulse is positioned within ±1° mechanical of the U-channel edge.
Index Pulse Width

The standard index pulse is 90° gated with A and B high.

A 180° gated B-high option is also available; factory consultation is required for this configuration.

ELECTRICAL SPECIFICATIONS

Input Power
5 VDC ±10%
  • Incremental-only models: 150 mA maximum
  • Incremental + commutation models: 175 mA maximum
  • Current ratings exclude output load.
Output Signals
Incremental output:
  • 26LC31 differential line driver
  • Maximum sink/source current: 40 mA
Commutation output:
  • Open-collector commutation output
  • Maximum sink current: 30 mA
  • Encoder incorporates 2.0 kΩ pull-up resistors.

MECHANICAL SPECIFICATIONS

Bore Sizes
Standard bore diameters:
  • 1/4 inch
  • 6 mm
  • 8 mm
Bore Tolerance

+0.001 / -0.000 inch
(+0.025 / -0.000 mm)

Dimensions
  • Outside diameter with cover: 1.55 in (39.8 mm)
  • Outside diameter without cover: 1.45 in (36.8 mm)
  • Outside collar height: 1.36 in (34.6 mm)
  • Inside collar height: 1.28 in (32.4 mm)
Required Mating Shaft Length
  • Outside shaft collar: 1.35 in (34.3 mm) minimum
  • Inside shaft collar: 0.50 in minimum
Mating Shaft Runout​

Maximum 0.002 in (0.05 mm), including shaft perpendicularity relative to the mounting surface.

Mounting Configuration:

Two standard configurations are available for tethers. A choice of U.S. or Metric screws are included. Mounting holes should be 0.01” (0.254 mm) true position to shaft for best encoder operation.

Shaft clamp:

2 #6-32 set screws in collar around hub shaft (will not mar shaft)

Electrical/Mechanical Alignment Range:

±15° mechanical typical (see tether options)

Acceleration:

100,000 rad/sec.2 max. Max.

Velocity:

RPM= (Frequency / PPR)x 60; or 12,000 RPM, whichever is less

Moment of Inertia:

8.2X10-5 in-oz sec.2 (5.8 gm/cm2 )

Housing & Cover Material:

Bearing housing: aluminum;

Cover:

high temperature, glass filled polymer;

Hub:

Brass;

Disk:

0.030” thick glass;

Cover Finish:

RAL 7010 (dark grey) Weight: 1.6 oz. (45gm) typ.