Reliance Electric Engineering Drive System and DBU Dynamic Braking Unit

Dangerous area: Drive control equipment should not be installed in dangerous (classified) areas unless the equipment has obtained the corresponding certification. The motor can be equipped with a fully enclosed or explosion-proof casing filled with clean air.

Humidity: The operating humidity range is 5% -95% (non condensing). Excessive humidity or condensation can cause short circuits or corrosion. DC motors require an absolute humidity of at least 2 grains per cubic foot to prevent excessive wear of the brushes.

Shock and vibration: can cause electrical connection failures, component looseness, or misoperation. Reliance Electric can provide mechanical consulting services.

Temperature: The maximum operating environment temperature is 40 ° C (without derating), and the minimum is 0 ° C. If exceeded, derating, auxiliary cooling, or heating are required. Equipment cooling requires free circulation of surrounding air, especially for non ventilated equipment.

3. Installation and startup steps

Site preparation: Ideally, all construction should be completed in the room where the equipment is located, the floor should be cleaned and sealed to reduce dust, and the air conditioning/filtration system should be in place and running. If it cannot be achieved, the equipment needs to be protected from cement dust, chemical atmosphere, condensation, extreme temperature, and physical damage.

Unpacking and handling: Protective packaging should be removed after the equipment reaches its final installation position. All provided eyebolts or lugs should be used, and suitable slings, crossbeams, and pads should be used to balance the load. The motor/reducer/base plate assembly must be lifted through the base plate, and the motor and reducer must be disconnected.

Calibration and anchoring: Before final anchoring, check if the equipment is level and if all anchoring points are adequately supported, using steel shims if necessary.

Installation of conduits: When opening holes in the casing, internal components must be protected from metal shavings and other debris. After installation, the cabinet should be cleaned.

Installation of rotating equipment: The alignment and anchoring of motors and reducers are crucial for their operational lifespan. Misalignment may lead to speed/torque fluctuations and even bearing/shaft failures. Please refer to the installation manual of the specific equipment. When the speedometer, pulse generator or rotary transformer is coupled with the motor, centering is particularly critical, and a flexible coupling with high torsional rigidity (such as Reliance part number 406041-A) must be used. It is the responsibility of the user to install suitable protective covers on rotating components such as couplings.

Electrical installation considerations: Ensure precise and stable operation

1. Responsibilities and Standards

The user and their electrical contractor are responsible for correctly installing the equipment according to the instructions in this manual and the engineering drawing package. Reliance Electric does not guarantee the performance of systems that do not comply with its recommendations, particularly regarding noise prevention requirements for signal lines. Electrical contractors must comply with all applicable power and control wiring specifications.

The main reference document is NFPA 70 National Electrical Code (NEC). Other relevant standards include NFPA 79, NEMA ICS series, IEEE 518, etc.

2. Key regulatory requirements

Branch circuit protection: Drive overload and short circuit protection may not necessarily provide branch circuit protection, and it needs to be designed in coordination with the upstream feeder length, cable rating, and upstream protection device.

Disconnecting device: If not provided by Reliance, a disconnecting device must be installed within 50 feet of the drive equipment and visible from the drive cabinet, with a rated value of at least 115% of the full load current.

Grounding: All non current carrying metal casings must be grounded. It is recommended to use high resistance grounding for the secondary of the isolation transformer that supplies power to the speed control drive to limit arc damage caused by grounding faults. Attention: The input and output circuits of the same speed regulation drive cannot be grounded simultaneously. All low-level signals and regulator circuits should be designed without grounding.

Wire gauge: Reliance Electric's W/E drawings provide full load current and voltage ratings for all power circuits, which can be used to select wire types and sizes according to NEC.

3. Wiring level and noise protection

According to the ANSI/IEEE 518 standard, system wiring is classified into four levels based on the sensitivity or ability of the circuit to noise, and must be physically isolated during installation to prevent noise interference:

Level 1 (high sensitivity): such as<50V analog signals,<15V digital signals, 4-20mA signals, rotary transformers, communication lines (coaxial cables, optical fibers), etc.

Level 2 (medium sensitivity): such as>50V analog signals,<50V switch signals, indicator lights, buttons, limit switches, etc.