SEW-Eurodrive DFY 71S/B User Manual

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14/004/92

T

DFS/DFY Synchronous

Motors

Operating Instructions

Edition 02/2000

0919 9519 / 0200

Table of Contents

Questions and Answers:

L
Linda Gonzalez DDSAug 15, 2025
Why does my SEW-Eurodrive DFY 71S/B motor overheat?
- B
  brianellisAug 15, 2025
  Your SEW-Eurodrive Engine motor may overheat due to several reasons: * Overload: Check the load with the controller current and configuration data. * Inadequate cooling: Adjust the cooling air supply or clear any blockages. Consider fitting a forced cooling fan. * Forced cooling fan not operating: Check the fan's connection and correct it if necessary. * Ambient temperature too high: Reduce the power. * Selected duty exceeded: Match the motor duty to the required operating conditions. Expert advice is recommended for selecting the correct drive. * Servo controller not optimized: Check the servo controller.
C
Courtney MolinaAug 18, 2025
What to do if my SEW-Eurodrive Engine motor will not start?
- B
  boydlindseyAug 18, 2025
  If your SEW-Eurodrive Engine motor won't start, here are a few things to check: * **Lead broken**: Check and restore the connections. * **Fuse blown**: Check the servo controller and replace the fuse. * **Circuit-breaker tripped**: Check the circuit-breaker, adjust if necessary, and check the drive for possible overload. * **Servo controller defective, connected incorrectly, or set incorrectly**: Check the servo controller and wiring.
P
patriciajacksonAug 21, 2025
Why is my SEW-Eurodrive Engine brake not releasing?
- D
  Douglas KerrAug 21, 2025
  The brake on your SEW-Eurodrive Engine might not be releasing due to the following reasons: * Wrong voltage at the brake: Apply the correct voltage (see nameplate). * Brake control unit failed: Replace the brake control unit, check the brake coil, the switching devices, and the connection. * Brake connected incorrectly: Check the brake connection. * Max. permissible working air gap exceeded due to worn brake lining: Replace the whole brake disc. * Voltage drop on the supply lead > 10 %: Ensure the correct supply voltage is connected and check the lead cross-sections. * Brake coil interturn fault or short circuit to frame: Change the complete brake with control unit and check the switching devices.
C
Cassie LewisAug 25, 2025
Why is my SEW-Eurodrive Engine motor too noisy?
- B
  Bridget BaileyAug 25, 2025
  Excessive noise from your SEW-Eurodrive Engine motor can be caused by: * Ball bearings distorted or damaged: Re-align the motor, check the driven machine, and replace the ball bearings. * Rotating parts vibrate: Rectify the cause or correct the imbalance. * Forced cooling fan: foreign matter in the cooling air passages: Clean the cooling air passages.
K
Kelly GrossAug 28, 2025
What causes a SEW-Eurodrive Engine brake to operate after a delay?
- J
  Jennifer WestAug 28, 2025
  A delayed brake operation in your SEW-Eurodrive Engine is caused by the brake being switched in the AC circuit. To resolve this, ensure simultaneous switch-off in the DC and AC circuits, referring to the wiring diagram.
S
Stephen SmithAug 31, 2025
Why is my SEW-Eurodrive DFY 71S/B brake noisy?
- A
  asimpsonAug 31, 2025
  Brake noise in your SEW-Eurodrive Engine can be attributed to: * Worn gearing due to jerky starting: Check drive configuration. * Oscillating torques due to incorrect servo controller setting: Check/correct servo controller setting in accordance with the Installation and Operating Instructions.
L
Lawrence FowlerSep 4, 2025
Why is the SEW-Eurodrive DFY 71S/B rotation direction wrong?
- L
  Lori BryantSep 4, 2025
  An incorrect rotation direction in your SEW-Eurodrive Engine is caused by incorrect motor control. Check the servo controller and setpoints, and change over setpoint leads.
L
lucas40Sep 7, 2025
What causes a SEW-Eurodrive DFY 71S/B Engine brake to not brake?
- S
  Samuel AguirreSep 7, 2025
  If the brake in your SEW-Eurodrive Engine is not braking, it could be due to: * Worn braking lining: Change the whole brake disc. * Manual brake release incorrectly set: Adjust the setting nuts. * Braking torque incorrect: Change the braking torque.
R
Riley DuncanSep 12, 2025
Why does my SEW-Eurodrive Engine motor hum?
- B
  Barbara HarrellSep 12, 2025
  A humming sound in your SEW-Eurodrive Engine motor could indicate: * Drive blocking: Check the drive. * Fault on resolver lead: Check the resolver lead. * Brake cannot be released: Check the brake. * Servo controller not set correctly: Check servo controller.

SEW-Eurodrive DFY 71S/B Specifications

General

Brand	SEW-Eurodrive
Model	DFY 71S/B
Category	Engine
Language	English

Summary

Safety Instructions

Installation and Assembly

Before You Begin

Preparation and checks before starting motor installation.

Preparatory Work After Extended Storage

Procedures for preparing the motor after a period of storage.

Installing the Motor

Step-by-step instructions for mounting the motor correctly.

Tolerances

Electrical Connection

EMC-compliant Wiring

Guidelines for wiring to ensure electromagnetic compatibility.

Connecting the Motor

Instructions for connecting motor power and signal leads.

DFS56 Motors with Terminal Boxes

DFY71-112 Motors with Terminal Box

Motors with Plug Connector

Connecting the Brake

Procedures for connecting the motor's brake system.

Connecting the Accessories

AV1Y Absolute Angle Encoder

Startup

Before You Begin

Essential pre-startup checks and conditions to ensure safe operation.

Startup

Procedures for initial motor startup and verification.

Inspection and Maintenance

Inspection and Maintenance Periods

Inspection and Maintenance Brake

Maintenance procedures specific to the motor brake system.

DFY 56 .. B Brake

DFY 71 ... DFY 112 .. B Brake

Retrofitting the Brake DFY71...DFY112

Preparing the Motor

Preassembly of the Brake Coil

Procedure for assembling the individual components of the brake coil.

Preassembly of the Brake

Steps for the pre-assembly of the brake unit before mounting.

Mounting the Brake to the Motor

Instructions for securely attaching the brake assembly to the motor.

Mounting the Manual Brake Release

Electrical Connection

Electrical connection steps for the retrofitted brake system.

Trouble Shooting

Problems with the Motor

Common motor operational issues and their corresponding solutions.

Brake Problems

Common issues related to the motor brake and their resolutions.

Appendix

Table 3: Technical Data of the Brake

Table 4: Adjustable Brake Torques

Table 5: Brake Coil Resistances

Assembly SM11 Plug Connector

Step-by-step guide for assembling the SM11 plug connector.

Assembly of the SM21 ... SM41 Plug Connector

Step-by-step guide for assembling SM21 to SM41 plug connectors.

Assembly Plug Connector DS56 Resolver

Step-by-step guide for assembling the DS56 resolver plug connector.

Assembly Plug Connector AV1Y

Step-by-step guide for assembling the AV1Y encoder plug connector.

General Design of DFY Motors

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Preview: SEW-Eurodrive DR2..71/BE Series

SEW-Eurodrive DR2..71/BE Series