SEW EURODRIVE DFY/DFS Synchronous Motor Guide

The key (71/19) remains in its original position.

After heating the brake bracket (70/20), push it into the non drive end shaft extension.

Install a new shaft clamp ring (62/20).

Let the bracket cool to room temperature.

6.2 Pre assembly of brake coil (Figure 20)

Insert the O-ring (281/20) into the groove of the brake coil (286/20) socket.

Use a cross head screw (310/20) and a locking washer (294/20) to secure the terminal connection piece (295/20) to the coil (not tightened).

6.3 Pre assembly of brake system

Insert the pre installed brake coil into the coil body (54/20) and lock it axially with a snap ring (285/20). Be careful not to damage the O-ring.

Use the second cross head screw and locking washer to secure the coil to the coil body through the second opening on the coil body. The protective grounding is achieved through the screw connection between the terminal connection piece and the coil.

Push two parallel pins (300/20) into the holes on the coil body to a depth that does not protrude from the pressure plate (49/20).

According to the required braking torque (Appendix Table 4), insert the brake spring (265/20) symmetrically into the circumferential hole of the coil body.

Tighten one auxiliary mounting nut on each of the two cross head screws (56/20).

Place the pressure plate (49/20) on the parallel pin, thread two cross head screws through the reserved holes on the coil body (for manual release) and screw them into the pressure plate to the depth that the threads do not protrude from the pressure plate.

Tighten the nut to pull the pressure plate towards the coil body.

Place the O-ring on the coil body.

6.4 Install the brake onto the motor

Place the clamping plate (69/20) with its opening facing forward into the slot of the bracket (70/20).

Slide the brake disc (68/20) onto the bracket (hub facing forward). First, position half of the brake disc on the bracket, and then fully push it in while rotating (the motor shaft needs to be fixed).

The middle ring (299/20) has ribs on three sides and one side is flat. The design of the non drive end bearing cover is similar.

Place the O-ring (392/20) on the non drive end bearing cover.

Position the middle ring at the centering fit of the non drive end bearing cover and level it.

Place the O-ring (393/20), then place the pre installed coil body (with pressure plate) on the middle ring (with opposite planes), gently tighten with four cross head screws (213/20), and do not lock it temporarily.

Remove the auxiliary installation screws. Tighten the cross head screw.

Knock the protective cap (301/21) into the coil body. If there is no manual release, use a sealing plug (28/21) to seal the through-hole on the coil body.

6.5 Installation of manual release device (Figure 21)

Insert two rubber rings (47/21) into the through holes of the coil body.

Secure the release fork (53/21) in the coil body using two bolts (56/21), corresponding springs (57/21), washers (302/21), and nuts (58/21). The gap between the nut and the release fork should be 2 mm.

Insert the manual release lever (51/21) into the release fork.

6.6 Electrical Connections

Connect the right angle connector (303/21) according to the wiring diagram in section 3.3. Turn on and off the brake multiple times to check if it is functioning properly.

Troubleshooting

7.1 Motor malfunction

Possible causes and countermeasures of the problem

Check and restore connections for motor failure, broken leads, blown fuses, tripped circuit breakers, servo controller faults/wiring errors/setting errors; Check the controller and replace the fuse; Check the circuit breaker and overload; Check the controller and wiring

Difficulty or inability to start the motor. Controller settings are incorrect or overloaded. Check the controller and wiring

Steering error motor control signal error check controller and set value, exchange set value leads

Motor buzzing, mechanical jamming, lead failure of rotary transformer, brake not released, controller setting error, inspection of driving machinery; Check the lead wires of the rotary transformer; Check the brake system; Check the controller

Motor overheating and overload, insufficient cooling, forced fan not turning, high ambient temperature, working mode exceeding limit, controller not optimized, load checked with controller current; Improve cooling airflow; Check the fan wiring; Reduce power; Choose the appropriate motor; Optimize controller parameters

Excessive noise, bearing deformation or damage, vibration of rotating parts, foreign objects in the cooling fan, re align, check the driven machine, and replace the bearings; Eliminating imbalances; Clean the cooling air duct

7.2 Brake malfunction

Possible causes and countermeasures of the problem

The brake cannot release due to voltage errors, control unit failure, wiring errors, working air gap exceeding the limit (lining wear), power line voltage drop>10%, coil turn to turn short circuit or ground short circuit, applying the correct voltage; Replace the control unit and check the coil resistance; Check the wiring; Replace the entire brake disc; Ensure correct power supply voltage and wire diameter; Replace the brake and control unit