SEW-Eurodrive DFY 90L/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:

K
Kristina EdwardsAug 14, 2025
Why does my SEW-Eurodrive DFY 90L/B Engine motor overheat?
- M
  Matthew ChavezAug 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.
J
John HahnAug 18, 2025
What to do if my SEW-Eurodrive Engine motor will not start?
- M
  Mr. Anthony JonesAug 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.
S
Stephanie AndersonAug 21, 2025
Why is my SEW-Eurodrive Engine brake not releasing?
- J
  Jeffrey CombsAug 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.
K
kristenevansAug 25, 2025
Why is my SEW-Eurodrive Engine motor too noisy?
- C
  Catherine BurkeAug 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.
J
James WillisAug 27, 2025
What causes a SEW-Eurodrive DFY 90L/B Engine brake to operate after a delay?
- S
  Sarah YoungAug 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.
N
Nancy AlvarezAug 30, 2025
Why is my SEW-Eurodrive DFY 90L/B brake noisy?
- J
  Jessica LambertAug 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.
C
Cody DavisSep 3, 2025
Why is the SEW-Eurodrive DFY 90L/B rotation direction wrong?
- S
  Sharon KellerSep 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.
J
Jason SnyderSep 6, 2025
What causes a SEW-Eurodrive DFY 90L/B Engine brake to not brake?
- S
  Stephen GonzalezSep 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.
S
Shawn GordonSep 10, 2025
Why does my SEW-Eurodrive DFY 90L/B motor hum?
- A
  Amy PerezSep 10, 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 90L/B Specifications

General

Brand	SEW-Eurodrive
Model	DFY 90L/B
Category	Engine
Language	English

Summary

Installation and Assembly

Preparatory Work After Extended Storage

2.3 Installing the Motor

Guidelines for physically mounting the motor.

Electrical Connection

EMC-Compliant Wiring

Requirements for wiring to ensure electromagnetic compatibility.

Motor Power Connection

Wiring details for motor power supply via terminal boxes or plug connectors.

Brake Connection

Instructions for connecting the motor's brake system.

Startup

4.1 Before You Begin

4.2 Startup Procedure

Steps for initiating the drive system's first operation.

Inspection and Maintenance

5.1 Inspection and Maintenance Periods

Brake Maintenance Procedures

Encoder Removal for Brake Maintenance

Retrofitting the Brake DFY71...DFY112

6.1 Preparing the Motor

6.2 Brake Preassembly and Mounting

6.5 Manual Brake Release Mounting

6.6 Electrical Connection

Trouble Shooting

7.1 Motor Problems

Common issues with motors and their solutions.

7.2 Brake Problems

Troubleshooting specific issues related to the motor brake.

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

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