SEW EURODRIVE DFY/DFS Synchronous Motor Guide

Use twisted pair shielded cables, with large areas of grounding at both ends of the shielding layer (through shielding clips or encoder plug housings).

The pins are crimping type, and the stripping length is shown in Appendix Table 1. After crimping, a heat shrink tubing should be used for protection.

The plug is fixed with a locking ring.

Connect to MOVIDYN ® (Figure 11) MOVIDRIVE ® +  DPA11A (Figure 12) or MOVIDRIVE ® +  The detailed wiring diagram of DIP11A (Figure 13) can be found in the manual.

Start up

4.1 Pre startup inspection

All connections are correct and the plugs are securely fastened to prevent loosening.

All motor protection functions have been activated.

The drive system has no mechanical blockage.

There are no other sources of danger.

The motor has no transportation/storage damage (if stored for a long time, insulation should be checked according to section 2.2).

4.2 Startup steps

Follow the servo controller (such as MOVIDRIVE) ®  Or MOVIDYN ®） Start the operation according to the instructions. It is recommended to use software tools such as MOVITOOLS and MD_SCOPE to assist in parameter setting and debugging. For synchronous motors with rotary transformers, the controller needs to perform "motor parameter identification" or "static measurement" to determine the number of pole pairs and initial position offset.

Inspection and maintenance

Before carrying out any maintenance work, it is necessary to disconnect the power supply of the drive system and prevent accidental power on. Do not disassemble the plug connector when it is live. Only original spare parts can be used.

5.1 Inspection and maintenance cycle

The service life of each component is affected by various factors, and the inspection cycle should be determined according to the project planning document. Regularly conduct visual inspections. The replacement of bearings must be carried out by SEW training personnel, as the zero position of the rotary transformer needs to be recalibrated after disassembling the motor each time.

5.2 Required Tools

standard tool

Encoder installation tool (Stegmann EW1, order number 81B 001 003 001)

Double headed stud (DIN 938): M5 × 45 for DFY71, M6 × 60 for DFY90, M8 × 70 for DFY112

5.3 Brake maintenance

5.3.1 DFS56.. B brake

This brake is maintenance free.

5.3.2 DFY71~112. B Brakes

Check the working air gap (Figure 15):

Measure the stroke of the pressure plate during brake release. Allowable range: 0.25~0.8 mm.

Brake with manual release: Measure on the bolt of the release fork.

Brake without manual release: Remove the screw plug, screw in the pressure plate with a screw (see section 5.2) (not too deep to avoid damaging the coating), and measure the stroke. After measurement, remove the bolts and reinstall the plugs.

Replace the brake disc (Figures 16 and 17):

Remove connector (17) and flat washer.

Brake with manual release: Remove the manual release lever. Without manual release: Remove the screw plug (23) from the hole.

Use two auxiliary installation screws and washers to pull the pressure plate (4) towards the brake spring. The bolts specified in section 5.2 must be used, as other screws may damage the brake disc.

Spin out the coil body (11) with O-ring (20).

Pull out the brake disc (2).

Remove debris.

Slide in the new brake disc. Caution: Do not contaminate with oil or grease.

Insert the coil body (11) and O-ring. Remove the auxiliary installation screws.

Reinstall the manual release lever or seal plug. Reinstall the gasket and connector, and secure them with the center screw. When installing the manual release lever, ensure that the gap between the disc (13) and the release fork (10) is 2 mm to ensure the normal function of the brake.

When the brake is equipped with an AV1Y absolute encoder (Figure 18), the encoder needs to be removed before contacting the brake:

Loosen the center screw of the right angle connector.

Loosen bolt (11), rotate spring washer (10) outward, and then remove encoder (12) with half coupling (9). Attention: The coupling is a two-stage plug-in connection!

Remove the protective cover (6, DFY71 only) and flange fixing bolts (3). Use an 8mm wrench and then a 4mm hex wrench to loosen the expansion shaft counterclockwise, thereby disconnecting it from the coupling. Stegmann EW1 tool can be used.

Remove the center screw of the middle flange (8) and the right angle connector.

Loosen the coupling clamping screw (9) and carefully remove the coupling from the motor shaft.

Brake maintenance can now be carried out. When reassembling, operate in reverse to ensure that the runout of the speed measuring shaft is ≤ 0.05 mm, and the coupling must not withstand axial tension.

Brake installation (DFY71~112)

If the motor does not come with a brake at the factory, it can be installed later. The steps are as follows:

6.1 Motor preparation (Figure 19)

Remove the screws (213/19) from the housing cover plate and remove the cover plate.

Remove the shaft clamp ring (62/19) from the second shaft extension end.

Use a suitable puller to pull out the liner (308/19). Pay attention to protecting the shaft seat and the rotating transformer behind it.