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addition to motors, the SMC Flex controller can be used to control
Description of Features Electronic Motor Overload Protection The SMC Flex controller incorporates, as standard, electronic motor overload protection. This overload protection is accomplished electronically with an I2t algorithm. When coordinated with the proper short-circuit protection, overload protection is intended to protect the motor, motor controller, and power wiring against overheating caused by excessive overcurrent. The SMC Flex controller meets applicable requirements as a motor overload protective device.
The controller’s overload protection is programmable, providing the user with flexibility. The overload trip class consists of either OFF, 10, 15, 20, or 30 protection. The trip current is programmed by entering the motor full-load current rating, service factor, and selecting the trip class.
Thermal memory is included to accurately model motor operating temperature. Ambient temperature insensitivity is inherent in the
electronic design of the overload.
Undervoltage Protection The SMC Flex controller’s undervoltage protection will halt motor operation if a drop in the incoming line voltage is detected. The undervoltage trip level is adjustable as a percentage of the programmed line voltage, from 0…99%. To eliminate nuisance trips, a programmable undervoltage trip delay time of 0…99 seconds can also be programmed. The line voltage must remain below the undervoltage trip level during the programmed delay time.
Overvoltage Protection If a rise in the incoming line voltage is detected, the SMC Flex controller’s overvoltage protection will halt motor operation. The overvoltage trip level is adjustable as a percentage of the programmed line voltage, from 0…199%. To eliminate nuisance trips, a programmable overvoltage trip delay time of 0…99 seconds can also be programmed. The line voltage must remain above the overvoltage trip level during the programmed delay time.
Excessive Starts Per Hour The SMC Flex controller allows the user to program the allowed number of starts per hour (up to 99). This helps eliminate motor stress caused by repeated starting during a short time period. Metering Power monitoring parameters include: 3-phase current Power Factor 3-phase voltage Motor thermal capacity usage Power in kW or mW Elapsed time Power usage in kWH or mWH Note: The motor thermal capacity usage allows the user to monitor the amount of overload thermal capacity usage before the SMC Flex controller’s built-in electronic overload trips. Built-in DPI Communication Capabilities A serial interface port is provided as standard, which allows connection to a Bulletin 20 Human Interface Module and a variety of Bulletin 20-COMM Communication Modules. This includes Allen- Bradley Remote I/O, DeviceNet, ControlNet, Ethernet, ProfiBUS, Interbus, and RS485-DF1. LCD Display The SMC Flex controller’s three-line 16-character backlit LCD display provides parameter identification using clear, informative text. Controller set up can be performed quickly and easily without the use of a reference manual. Parameters are arranged in an organized four-level menu structure for ease of programming and fast access to parameters. Keypad Programming Programming of parameters is accomplished through a five-button keypad on the front of the SMC Flex controller. The five buttons include up and down arrows, an Enter button, a Select button, and an Escape button. The user needs only to enter the correct sequence of keystrokes for programming the SMC Flex controller. Auxiliary Contacts Four fully programmable hard contacts are furnished as standard with the SMC Flex controller: Aux #1, Aux #2, Aux #3, Aux #4 N.O./N.C. Normal/Up-to-Speed/External Bypass/Fault/Alarm/Network Network I/O The SMC Flex can have up to two inputs and four outputs controlled via a communication network. The output contacts use the auxiliary contacts. Ground Fault Input The SMC Flex can monitor for ground fault conditions. An external core balance current transformer is required for this function. See SMC Flex User Manual for additional information. Tach Input A motor tachometer is required for the Linear Speed Start mode. Please see the Specifications section on page 22 for tachometer characteristics. PTC Input A motor PTC input can be monitored by the SMC Flex. In the event of a fault, the SMC Flex will shut down and indicate a motor PTC fault.
For more information, please visit http:///catalogs/
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