The size of each CRC-Evans Motor Control Center (MCC) cabinet is dependent on the amount of electrical components needed for system operation. MCCs are built with the expectation that 480VAC 3-phase power will be supplied. Any other required voltage level will be generated by the MCC. Any 480VAC branch connected to a motor will have appropriately sized overload protection.
Built to UL508A Standards
All electrical panels are designed and built to UL508A standards. This includes a 3-pole main circuit breaker as well as appropriately sized branch protection for any individual load connected to the 480VAC source. Wires are color-coded to indicate voltage level present on the wire. Additionally, all wires within each electrical panel are labeled with wire number based on matching electrical schematics for easy troubleshooting. CRC-Evans strives to use Siemens electrical hardware although other manufacturers can be used if requested by the customer. All components are readily available off-the-shelf components that can easily be found at any Siemens distributor.
Sinamics G Converters
Sinamics G type frequency converters are used for movement of 480VAC 3-phase motors. The Sinamics G drives are modularly designed so that if any part of the drive needs to be replaced only a single module is needed instead of a complete drive unit. The Sinamics G family of converters is capable of supporting a multitude of motor sizes up to several hundred HP. Power modules for Sinamics family drives can be purchased with line reactance built in to reduce harmonic effects within the electrical system. Appropriately sized braking resistors are used where needed and depend on the function and load of the motor they are being connected to.
Programmable Logic Controllers
S7-1200 and S7-1500 type programmable logic controllers (PLCs) can be integrated into any system. Using PLCs reduces the need for all other electrical logic hardware and frees up valuable panel space within the MCC. Additionally, remote input/output racks can be located wherever they are needed which reduces the need to run multiple control cables between the MCC and a remote IO rack location.