SEW EURODRIVE DFY/DFS Synchronous Motor Guide

When installing transmission components according to DIN 332 DR type, it is recommended to use a center hole to protect the bearings

Electrical connection

Before making any electrical connections, safety regulations must be strictly followed (see Section 1 of the manual).

3.1 EMC compliant wiring

To ensure electromagnetic compatibility, the following principles should be followed (in conjunction with the installation instructions of the servo controller):

The signal line must use twisted pair shielded cables: reference signals (R1/R2), sine/cosine signals (S1/S4, S2/S3), and TF/TH thermal protection signals each use a pair of twisted pair cables.

The brake cable should be laid separately from the power cable; If separation is not possible, the power cable must be shielded to prevent electromagnetic interference from affecting the brake action.

3.2 Motor wiring

3.2.1 DFS56 Terminal Box Motor

Connect the power cable to the terminal block (cage spring clip): U, V, W, and PE (see Figure 2 in the manual).

Note: The rotation direction cannot be changed by exchanging the phase sequence (the rotation transformer determines the commutation logic).

Connect the rotary transformer signal and TF thermal protection to the other terminal busbar (Figure 3):

1: R1 (reference+), 2: R2 (reference -)

3: S1 (cosine+), 4: S3 (cosine -)

5: S2 (sine+), 6: S4 (sine -)

9: TH/TF (Motor Thermal Protection)

All wiring must be tightened.

3.2.2 DFY71~112 Terminal Box Motor

Connect the power cable to the terminal board (Figure 4): U, V, W, and Φ (PE).

The rotary transformer and TH/TF signal are connected to the terminal block (Figure 5), with pin definitions similar to DFS56, but with an additional 10th pin (not used).

All wiring must be tightened.

3.2.3 Motors with plug connectors (DFY56 and DFY71~112)

SEW provides prefabricated connecting cables. If making cables on your own, please refer to the plug assembly instructions in the appendix (SM11, SM21, SM32, SM41, etc.). Main pin allocation:

DFY56 power/brake plug (Figure 6):

Pin 1: U phase, Pin 3: W phase, Pin 2: V phase, Pin 4: PE (yellow/green)

Pin 5: Brake+, Pin 6: Brake-

DFY71/90/112 power plug (Figure 7):

Pin 1: U, Pin 2: V, Pin 3: W, Pin 4: PE

Rotary transformer/TF plug (Figure 8):

Pin 1: R1 (pink), 2: R2 (gray), 3: S1 (red), 4: S3 (blue), 5: S2 (yellow), 6: S4 (green), 9: TH/TF (white/brown)

All plugs use crimping pins (DFS56's rotary transformer plug is welded). Special crimping tools must be used, and the stripping length is shown in Appendix Table 1. Incorrect assembled pins should be removed using a dedicated ejector. Finally, secure the plug with a locking ring.

3.3 Brake Connection

The brake is electrically released and mechanically braked (spring brake after power failure). Important precautions:

Comply with the regulations of the Employers' Liability Insurance Association regarding phase loss protection.

The cross-section of the brake cable should be selected according to the braking current (see Appendix Table 3).

Due to the high DC voltage and current of the switch, it is necessary to use dedicated brake contactors or AC3 rated (EN 60947-4-1) AC contactors.

3.3.1 DFS56.. B brake

Directly controlled by 24V DC ± 10%.

3.3.2 DFY71~112. B Brakes

The brake rectifier (BM.. Series) or BSG brake control unit is installed in the control cabinet. The brake is connected using a 4-core cable (Figure 9):

The brake coil is powered by BM rectifier or BSG unit.

For elevator applications, the brake must be disconnected simultaneously on both the DC and AC sides (refer to Figure 8 on page 10 of the manual for dual circuit disconnection).

The brake plug (right angle type) is wired by the customer themselves, with pin definitions of 1, 2, 3, and PE. It is fixed with a central screw and must not be loosened when powered on.

3.4 Attachment Connection

3.4.1 Motor Thermal Protection (TF/TH)

TF (PTC Thermistor): Complies with DIN 44082. The resistance value is 20-500 Ω at room temperature, and>4000 Ω when overheated. When measuring, instruments with measuring voltage ≤ 7.5 V or current ≤ 1 mA should be used.

TH (Embedded Temperature Control Switch): Connected in series, the contact opens when the winding temperature exceeds the standard. Electrical data:

AC maximum 60 V (terminal box version allows 250 V AC), 2.5 A (power factor 1.0) or 1.6 A (power factor 0.6)

DC maximum 60 V, 1.0 A

3.4.2 VY forced cooling fan

The fan wiring diagram is shown in Figure 10:

Pin 1: Phase line L, Pin 2: Neutral line N, Pin 4: PE (yellow/green)

3.4.3 AV1Y Absolute Encoder

AV1Y absolute encoder with 1-meter connecting cable and matching plug (including crimping pin). SEW also provides extension cables for connecting MOVIDRIVE ®  Or MOVIDYN ®  controller. The pin allocation is as follows:

Pin signal indicates wire color

10 GND power supply ground brown (BN)

7 Vs+13~15~24 V DC white (WH)

14 Data+Serial Data Output, High Level="1" Black (BK)

17 Data - Serial data output, low level="0" purple (VT)

8 Pulse+clock current loop, 7 mA flowing to Pulse+="1" pink (PK)

9 Pulse - Clock current loop, 7 mA flowing to Pulse -="0" gray (GY)

Connection requirements: