Control Techniques 115E3D300BFCAA Rotary Encoder Unit

Module Feature

115E3D300BFCAA (part number 115240) is a heavy-duty 300 PPR optical rotary encoder manufactured by Control Techniques,developed exclusively for large frame high-torque servo motor closed-loop position feedback. It uses non-contact optical grating sensing to convert mechanical rotary movement into digital quadrature pulse signals. RS-422 differential A/B/Z phase output delivers outstanding anti-electromagnetic interference performance and stable signal transmission over long cable lengths inside high-power servo cabinets. Robust metal shielding housing isolates interference originating from high-current power drive circuits. Built-in BIT diagnostic circuit continuously monitors power rail condition and optical signal path integrity; fault codes can be retrieved via Control Techniques Unidrive Tools configuration software. Reinforced heavy-load bearing assembly offers superior shock and vibration resistance,widely applied in heavy industrial servo axis control,power equipment test bench and hardware-in-loop real-time simulation chassis.

Working principle

When high-torque servo motor shaft rotates,the optical grating disc rotates synchronously. Infrared LED light penetrates grating slits and is captured by photodiode array,generating A/B quadrature pulses for speed and rotation direction calculation and Z index pulse for origin homing routine. RS-422 differential line driver transmits these feedback signals to the Control Techniques servo drive feedback port. BIT circuit checks LED luminous intensity and supply voltage level to identify hardware failure. Thick metal shield suppresses EMI coupling from heavy-gauge high-current power wiring.

Onboard components

Infrared LED light source,300 PPR heavy-duty precision optical grating disc,photodiode receiver array,RS-422 differential line driver,thick metal shielding enclosure,heavy-duty precision shaft bearing assembly,multi-pin heavy-duty feedback connector,BIT power and optical signal detection hardware.

LED indicators

LED indicators for power supply status and BIT fault alarm.

Hardware self-diagnosis

Visual inspection of housing,shaft and connector;BIT power supply and optical signal amplitude test;A/B/Z phase waveform verification;shaft rotation smoothness inspection.

Programming software

Control Techniques Unidrive Tools software,supports encoder parameter setup,position signal monitoring and BIT fault log reading.

Electrical & Process Parameters

Model:115E3D300BFCAA 115240 Brand: Control Techniques Device type: Heavy-duty servo optical quadrature rotary encoder Resolution:300 PPR Power supply:5 V DC Signal output:RS-422 differential A/B/Z quadrature signal Shaft type:Solid shaft Control mode:Non-contact optical position measurement,differential signal transmission,heavy-duty metal EMI shielding,built-in BIT health monitoring Cooling: Natural convection cooling Protection: Reverse polarity protection,reinforced metal housing mechanical protection Mounting: Flexible coupling connected to high-torque servo motor shaft Protection class: Metal sealed housing

Mechanical & Structure

Mounting: High-torque servo motor shaft flexible coupling mounting Protection class: Metal shield housing

Environmental

Operating temperature:-40℃ ~ +85℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:20~80% non-condensing Certification: CE compliant Status: Control Techniques heavy-duty 300 PPR optical quadrature encoder for high torque servo closed-loop feedback

Installation

Follow ESD safety procedure before handling.Align encoder shaft with high-torque servo motor shaft and install heavy-duty flexible coupling.Tighten coupling screws properly,avoid excessive radial or axial load.Connect 5 V DC power and differential A/B/Z feedback cable to Control Techniques servo drive feedback port.Power on system,open Unidrive Tools,run BIT diagnostic before commissioning.

Interface

Multi-pin heavy-duty feedback connector for 5 V power,ground and A/B/Z differential quadrature signals.

Diagnostic

No pulse output: 5 V power loss,loose connector or failed LED source. Reverse rotation direction: A and B phase wires swapped. Missing Z reference pulse: grating disc contamination or Z channel circuit damage. Jittery position reading: insufficient shielding or ground loop noise.

Product Brief

Control Techniques 115E3D300BFCAA (115240) heavy-duty servo optical rotary encoder,300 PPR resolution,RS-422 differential A/B/Z quadrature output,reinforced metal EMI shielding and built-in BIT self-check,provides reliable high-precision shaft position feedback for Control Techniques large frame high-torque servo drives and hardware-in-loop simulation systems.