Reliance Electric Engineering Drive System and DBU Dynamic Braking Unit

Level 3 (low sensitivity): such as>50V switch signals, AC feeders below 20A, contactor coils, etc.

Level 4 (power circuit): such as>20A or>250V AC feeder, motor armature circuit, etc.

Key installation practices (based on IEEE 518 and Reliance experience):

Spacing requirements: Tables 4.1, 4.2, and 4.3 provide detailed specifications for the minimum spacing between cable trays, conduits and cable trays, and conduits, with different requirements for different grades.

Wiring rules: Different levels should be routed through separate conduits or cable trays. Level 1 and Level 2 trunking must have solid bottom and cover plates, and should be made of steel to provide magnetic shielding. When necessary, Level 1 and Level 2 can be separated by grounding steel partitions in the same trunking. When different levels intersect, they should form a 90 degree angle. When entering the junction box, isolation should be maintained. Wiring should be kept as far away as possible from high-power equipment greater than 100KVA.

Signal line specifications: Table 4.4 provides recommended signal line models (such as Reliance part number 417900-92DAD for long-distance twisted pair cables). For the wiring of rotary transformers, it is recommended to use unshielded twisted pair cables with at least 2 twists per inch (half inch pitch). The specific model and maximum distance are shown in Table 4.7.

Special cables:

Coaxial cable: used for high-speed communication (such as R-Net) ™ The internet). RG-59/U is the standard, RG-11/U has better performance/used for longer distances. It needs to be processed according to Level 1 wiring and separated from all power and control lines. Refer to the corresponding manual (such as J2-3009) for installation details.

Fiber optic cable: used for AutoMax distributed systems. 62.5/50 micron duplex optical fiber (specifications as shown in Table 4.6) needs to be selected. Special attention should be paid to protection during installation to avoid excessive bending, stretching, or contact with chemicals. It is recommended to have experienced contractors carry out installation and termination.

Coil suppression: If the wiring with third-party equipment enters the Reliance cabinet or shares conduits/trunking, all relay and contactor coils in the third-party equipment must be installed with suppression circuits as shown in Figure 4.3.

4. Connect the wires to the drive cabinet

The on-site wiring entering the Reliance cabinet (NEC defined as "house wiring") must comply with the above IEEE isolation rules and should enter from the designated conduit entry point closest to the provided terminal (see dimension diagram). It is strictly prohibited to mix the wiring of the house with the wiring inside the cabinet in the internal trunking, nor to cross areas not designated for customer wiring, otherwise it may affect the warranty of related circuits.