OPERATION

The SMMC-3 is a programmable controller, capable of controlling three separate snow/ice melting zones. A control relay for each zone is included in the SMMC-3 to operate a contactor for each zone to energize the snow/ice melting equipment. There are two operating mode selections possible with the SMMC-3:

MODE 1 – INDEPENDENT

In this mode each snow/ice melting zone is controlled independently. Mode 1 allows all 3 zones to be energized simultaneously. This mode is best used where circuit loading is not a concern (e.g. adequate circuit ampacity is available to operate the entire snow/ice melting load simultaneously).

MODE 2 – PRIORITY

In this mode each zone is controlled on a priority basis, with the most critical zone (always Zone 1) being melted first, followed then by the less critical zones. Mode 2 allows only 1 of the zones to be energized at a time. This mode is best used where circuit loading is a concern. A slight delay is provided when switching power between zones to ensure circuits are not overloaded. Set-up in Mode 2 must be done either with Zones 1 & 2, (with Zone 3 not being used), or Zones 1, 2 & 3. Operation is sequential, beginning with Zone 1. When Zone 1 is melted, the SMMC-3 de-energizes it and then energizes Zone 2. However if snow/ice is detected on Zone 1, Zone 2 is de-energized and Zone 1 re-energized. Similar logic applies for Zone 2 & 3; i.e. the lower numbered zone always takes priority.

The Priority mode available in the SMMC-3 can reduce circuit loading by splitting up a large snow melting area into separate, smaller zones. For example, if a large area would require 90 Amps of current, this could be split into two separate zones of, say, 50 Amps in one zone and 40 Amps in the other. Then, by programming the SMMC-3 in the Priority Mode, only one zone will be enabled at any on time, resulting in a maximum circuit loading of 50 Amps.

Similarly, the area could be split into three zones of, say 25, 35 and 30 Amps; in this case circuit loading would be 35 Amps maximum. It should be further noted that when in Priority mode, the SMMC-3 always gives priority to Zone 1; when Zone 1 is completely melted, then Zone 2 is enabled until melted, and then, finally Zone 3; i.e. Zone 1 always has higher priority over Zone 2, which has higher priority over Zone 3. Further, if snow/ice is detected in a zone with higher priority, then operation reverts to the zone with higher priority. For example, if melting has been completed in Zone 1, and Zone 2 has been enabled, then if snow/ice is detected in Zone 1, operation in Zone 2 will be suspended, and Zone 1 will be re-enabled until melting is again complete, at which time melting in Zone 2 will recommence.

It is also important to give consideration to the assignment of zones; usually, high traffic areas will be given a high priority, with lower traffic areas given lower priority. Zones can be easily reassigned at the terminals of the SMMC-3.

PO. Box 726 n TULSA, OK 74101 n TEL 918-627-5530 n FAX 918-641-7336 n www.nelsonheaters.com

GA-2318, R1

Sheet 7 of 15

May 2008

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Emerson SMMC-3 manual Operation, Mode 1 Independent, Mode 2 Priority
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SMMC-3 specifications

Emerson SMMC-3 is a cutting-edge controller designed to enhance the efficiency and reliability of industrial automation processes. This smart motor management controller is specifically engineered to optimize the operation of motors and related systems, making it a crucial component in various industrial applications.

One of the standout features of the SMMC-3 is its advanced motor protection capabilities. It provides comprehensive protection against common motor faults such as overloads, phase failures, and short circuits. This ensures that the motors operate within safe parameters, thereby prolonging their lifespan and reducing maintenance costs. The SMMC-3 can be easily configured to meet specific application needs, making it versatile for a wide range of industries.

In addition to protection, the SMMC-3 offers real-time monitoring and diagnostics. It utilizes built-in sensing technologies to continuously monitor key motor parameters, including voltage, current, frequency, and temperature. This data is critical for predictive maintenance, allowing operators to anticipate potential issues before they escalate into costly downtime or equipment failure.

The SMMC-3 supports various communication protocols such as Modbus RTU and TCP, allowing for seamless integration into existing control systems. With its communication capabilities, users can easily access performance data remotely, facilitating better decision-making and resource management.

Another noteworthy characteristic of the SMMC-3 is its user-friendly interface. The device features an intuitive display and menu structure, making it straightforward for operators to configure settings, view performance metrics, and troubleshoot any issues. This ease of use significantly reduces training time and enhances overall operational efficiency.

Moreover, the SMMC-3 employs advanced algorithms and technologies for energy management. It helps in monitoring energy consumption, identifying inefficiencies, and providing recommendations for energy savings. This capability is increasingly important in today’s industrial environment, where reducing energy costs is a top priority.

In summary, Emerson SMMC-3 embodies state-of-the-art technologies and features that elevate motor management in industrial automation. With its robust protection mechanisms, real-time monitoring, versatile communication options, user-friendly design, and energy management capabilities, the SMMC-3 is an invaluable asset for industries striving for operational excellence and sustainability.
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