Wiring of SEW motors with brakes

Regarding the wiring issues of SEW motors with brakes, first verify the wiring diagrams for the motor and the brake to ensure proper connections. Based on the information you provided, the brake uses 380V, and inside the wiring box, the white, red, and blue wires are already connected to terminals 1, 3, and 5 respectively. In the four-core cable from the control room to the brake, two of the cores should be connected to terminals 2 and 3 for power supply. If the remaining two wires are the ground wire and an additional control or protection wire, the wiring should be carried out in accordance with the specific model of the motor and brake, as well as the accompanying instructions. Be sure to consult the device’s official documentation or contact SEW’s technical support for more accurate guidance. .

Thank you. It’s not clear from the instructions; the schematic diagram shows U, V, W plus a ground wire. On the terminal block in the control room, the upper end of the motor brake is connected using U, V, W, and PE as well. Therefore, the wiring leading to the motor brake at the site should also consist of three phases plus a ground wire

Based on your description, if the wiring in the control room and at the motor side is labeled and connected using U, V, W, and PE (ground), then the wiring for the motor brakes on site should follow the same standards. The three-phase wires U, V, and W here are used for power supply, while the PE wire is used for grounding. You need to ensure that each core of the cable is correctly matched to its function: 1. The U, V, and W wires are connected to the motor’s U, V, and W terminals respectively. 2. The ground wire (PE) is connected to the motor’s grounding terminal. Since brakes are usually controlled using two phases of the power supply, it is necessary to determine the specific wiring requirements for the brakes. As stated in the brake’s instruction manual, two of its wires should be connected to terminals 2 and 3; these are usually the power input terminals for the brake. If there are still uncertainties, it is recommended to consult SEW’s technical support directly, providing the motor model and the specific electrical diagrams to obtain more accurate wiring instructions. Doing so can prevent equipment damage or safety accidents caused by incorrect wiring. .

Thank you. The wiring diagram I’m referring to, that of the connections at the brake area (the BGE module) terminal block, shows the wires as U, V, W, and PE – it’s not the wiring for the motor inside. That’s why I feel confused.

According to your description, the wiring diagram for the brake of the BGE module shows the U, V, W, and PE wires. Here, U, V, W are the three-phase power inputs, and PE is the ground wire. This wiring diagram shows the input requirements for the brake. Connecting the four-core cable in the control room to its corresponding counterpart is likely the correct wiring method. It should be noted that although the wiring sequences of the motor and the brake may be the same, this does not mean they can be interchanged. Since the brake is controlled using two phases of the power supply, two of the conductors are typically connected to the power input terminals, while the remaining two may be used for grounding and overload protection signals. Since you have doubts regarding the actual wiring, it is highly recommended that you contact SEW’s technical support. By providing the model of your device, the specifications of the cables, and the wiring setup at the site, they will be able to give you the most accurate guidance on wiring to ensure the proper operation of the device and its safe use. .

Final confirmation: in the four-core cable, two of the cores are connected to power terminals 2 and 3 of the BGE module, while the other two cores are not connected; the schematic diagram is incorrect.

If it is confirmed that the power wiring of the BGE module needs to be connected to terminals 2 and 3, and the information shown in the schematic diagram differs from this, it is recommended to follow the instructions provided in the device’s manual or by technical support. Before proceeding with actual operation, please confirm the following points once again: 1. **Verify the power terminals**: Ensure that terminals 2 and 3 are the correct power input terminals; this can be confirmed by checking the manual for the BGE module or by consulting technical support. 2. **Understanding the schematic**: Sometimes, the schematic may be simplified in terms of design, or there might be updates that haven’t been reflected yet. Compare the wiring instructions in the device manual with the schematic diagram to ensure you understand the function of all terminals. 3. **Safety check**: Before connecting the cables, make sure all power sources are turned off to avoid electric shock or device damage. 4. **Handling of the remaining two wires**: Determine the function of the two remaining wires (whether they are ground wires or other control wires). If these wires do not need to be connected, ensure they are properly isolated to prevent short circuits caused by unused wire ends. After completing the above steps, if you still have doubts or concerns regarding safety, be sure to contact a professional to carry out the operation. Following the correct wiring procedures can effectively ensure the stability and safety of equipment operation. .

The schematic should be correct; the brake module merely controls the brake coil. Since frequency conversion is used for control, a DO from the frequency converter is needed to switch the on/off state of the brake coil. One method is for DO to directly control the contactor in order to turn the brake control module on or off; a 2-core cable is sufficient, connecting to terminal 23 of the module ； Another approach is to provide a constant power supply to the modules; the DO control is used to switch on and off the terminals 4 and 5 of the modules via the main node. In this case, a 4-core cable is required – 2 cores for the 380V power supply connected to terminal 23, while the other 2 cores are connected to terminals 4 and 5 and lead back to the main node inside the control cabinet. For the first type, there should be a short circuit at the 4th and 5th terminals; for the second type, the short circuit needs to be removed.