Reliance Electric Engineering Drive System and DBU Dynamic Braking Unit

System documentation: "Map" for installation and maintenance

Reliance Electric provides a standard document set for each engineering drive system, which is the core basis for understanding, installing, and maintaining the system.

1. Engineering drawings

Drawings are usually identified by a two letter prefix followed by a six digit number. The main types include (see Table 2.1):

W/E (Electrical Schematic): It displays the electrical connections between electronic and electrical equipment in the system, and is a functional representation that does not reflect physical dimensions or positions. Includes additional instructions, standard notes, and on-site wiring information.

W/D (Wiring Diagram): Reference diagram for standard components, including schematic diagram.

W/L (Panel Layout): Display the physical layout of electrical equipment on the control panel, including customer wiring terminals with wire numbers. The drawings themselves also serve as a Bill of Materials (B/M).

W/M (Motor Control Center Diagram): Display the positions of each unit in the motor control center and their corresponding W/E diagrams.

W/F (process diagram): may include process flow (drive section, motor relationship diagram), communication single line diagram, AC power single line diagram.

W/I (Interconnection Wiring Diagram): Optional, listing a list of all interconnected on-site wiring between components.

W/S (Construction Drawing): Provide installation information for Class A or Class B open mill control or control rooms, including overall dimensions, installation details, and conduit inlet locations.

W/N (Annotation Page): Describe wiring instructions, define standard annotations and terminology used in the drawing.

W/O (Operator Station Diagram): Display the layout of operating equipment and the location of on-site terminals.

W/P (Program Document): Application task diagram based on software system.

W/X (index page): List the descriptions, last revision dates, and other information of all drawings in the sales order.

The drawing adopts ANSI/NEMA standard equipment symbols. After the equipment is shipped, the W/E, W/M, W/P drawings and software list will be updated based on changes during manufacturing and testing, and will be updated again after startup as a revised page of the "Instruction Manual".

2. Instruction manual

The instruction manual is a complete record of the supplied equipment, including a list of equipment, operation description (optional), various manuals (motors, speed measuring machines, etc.), dimension tables, electrical diagrams (reduced version), engineering data, and spare parts list. For software based systems, it also includes a documented list of operating system and application disks, as well as customized application software.

3. Component identification

All components used in the system have Reliance Electric part numbers or component numbers for replacement. The main types include commercial part numbers (with suffix "CPx"), customer property part numbers (with prefix or suffix "CPT"), Reliance Electric standard part numbers, and standard models. When ordering spare parts, the complete part number must be used.

Mechanical installation considerations: creating an ideal 'home' for equipment

The physical environment of the driving system directly affects its operational reliability and lifespan.

1. Site planning

Space requirements: Adequate ventilation and maintenance access space must be provided for the equipment. Table 3.1 lists the minimum front to back and top clearances required for various types of equipment (wall mounted control boxes, floor standing consoles, cabinets, rolling mill control rooms, etc.). In addition, it is necessary to meet the requirements of Articles 110-16 of the National Electrical Code (NEC) for workspaces.

Installation and anchoring: All equipment must be securely installed on a rigid structure or foundation, with a flat installation surface to avoid equipment deformation or stress. The supporting structure of rotating equipment must be able to withstand torque and equipment weight.

Wiring channel: All dimensional drawings of the casing indicate the location where conduit can be installed with openings.

2. Operating conditions

The equipment design is suitable for the standard service conditions defined by NEMA. If exceeded, special treatment or selection of a higher protection level casing is required.

Altitude: The standard design is suitable for altitudes below 1000 meters (3300 feet) and does not require derating. For higher altitudes, consult a sales engineer.

Corrosive environment: optional NEMA 4X enclosure, or introducing clean air into the control cabinet and installing it in an air-conditioned environment. The motor should be of the fully enclosed enhanced type (XT).

Dust: Insulation dust increases contact resistance, while conductive dust causes short circuits. NEMA 12 or NEMA 1A cabinets with positive pressure ventilation and filters can be selected, or the equipment can be installed in the air conditioning control room. The motor can be selected as a forced air cooling or fully enclosed type with a filter.