SEW-Eurodrive DFY 71L/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:

J
John ThomasAug 14, 2025
Why does my SEW-Eurodrive DFY 71L/B motor overheat?
- N
  Norma WilcoxAug 14, 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.
S
stanley90Aug 17, 2025
What to do if my SEW-Eurodrive Engine motor will not start?
- C
  cynthiaalvarezAug 17, 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.
T
tdeleonAug 21, 2025
Why is my SEW-Eurodrive Engine brake not releasing?
- D
  Drew MccormickAug 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.
M
maylauraAug 25, 2025
Why is my SEW-Eurodrive DFY 71L/B Engine motor too noisy?
- S
  shannon43Aug 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.
R
Rose SalinasAug 27, 2025
What causes a SEW-Eurodrive DFY 71L/B brake to operate after a delay?
- T
  Taylor FrancoAug 27, 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.
M
Maria ThompsonAug 30, 2025
Why is my SEW-Eurodrive DFY 71L/B Engine brake noisy?
- J
  Jonathan DavisAug 30, 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.
M
marcdavisSep 3, 2025
Why is the SEW-Eurodrive DFY 71L/B Engine rotation direction wrong?
- C
  Carla EnglishSep 3, 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.
T
tammy80Sep 7, 2025
What causes a SEW-Eurodrive DFY 71L/B Engine brake to not brake?
- C
  Christopher EllisSep 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
Rebecca BeckSep 9, 2025
Why does my SEW-Eurodrive DFY 71L/B motor hum?
- N
  Nathan JohnsonSep 9, 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 71L/B Specifications

General

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

Summary

Safety Notes

Safety Instructions

Installation/Assembly

Installing the motor

Steps for mounting and installing the motor onto a support.

Electrical Connection

EMC-compliant wiring

Connecting the motor

Instructions for wiring the 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.

DFS 56 .. B Brake Connection

DFY 71-112 .. B Brake Connection

Startup

Before you begin

Checks and preparations before starting the motor.

Startup

Steps for initial startup and operation.

Inspection/Maintenance

Inspection and Maintenance Periods

Brake Inspection and Maintenance

Procedures for inspecting and maintaining the brake.

DFY 56 .. B Brake Maintenance

DFY 71-112 .. B Brake Maintenance

Maintenance for the DFY 71-112 B brake.

Retrofitting the Brake DFY71...DFY112

Preparing the Motor

Preassembly of Brake Coil

Preassembly of Brake

Mounting Brake to Motor

Mounting Manual Brake Release

Electrical Connection for Brake Retrofit

Trouble Shooting

Motor Problems and Solutions

Common motor issues and their solutions.

Brake Problems and Solutions

Troubleshooting specific to brake malfunctions.

Related product manuals

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SEW-Eurodrive DFY 112L/B

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SEW-Eurodrive DRN100

SEW-Eurodrive DRN160

SEW-Eurodrive DRN80/BE

SEW-Eurodrive DR..71 Series

SEW-Eurodrive DR..90 Series

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

SEW-Eurodrive DR2..71/BE Series