Electric motors are found extensively in both the manufacturing and processing industries. Both AC and DC powered motors are used to drive pumps, fans, conveyors and a broad range of specialized equipment. There are many types of motors designed for many different applications, however all require electrical current in order to generate the magnetic fields that are necessary to create rotation. By measuring this current useful information can be made available regarding the status of the motor and the equipment that is connected to it. This may be as basic as independently verifying the run status of the motor or in conjunction with a PLC, for example, to protect a pump against dry run. Thus current may be used to both monitor and protect motors and motor-driven equipment.
In all cases refer to relevant installation instruction and correct fit-up tolerances. The use of anti-backlash coupling for shaft to shaft coupling is advised.
Encoders are applied to measure speed and position in a wide variety of applications and are therefor available with numerous mounting styles. The mounting style should be selected carefully to best fit the application at hand.
When conveyors jam and the drive motor continues to run, expensive mechanical damage to the drive components often occurs. By installing an NK Technologies’ Current Operated Switch an overload condition, detected by higher than normal running amps, can be used to switch off power to the motor before mechanical damage results. The switch setting can be adjusted so it is not affected by normal changes in conveyor load. Current operated switches are the modern day equivalent of less reliable electromechanical jam relays that have been in use for many decades.
In situations where there may be large variations in load an NK Technologies Current Transducer can be used to monitor conveyor motor amp draw and output this data to the conveyor control systems, commonly a PLC. The PLC may be programmed to accomodate different setpoints for different mechanical loads so that jam protection is provided from light to heavy loads. In situations where the conveyor is not able to accept analog signals NK Technologies has developed a patented transducer with a frequency output suitable for the Digital Inputs of most PLC’s.
Electro Cam Corp. is pleased to offer this sneak preview of our new PS-2252-12-TP1 Net Forward Encoder Interface (NFEI). Ideal for applications requiring perfect alignment, the NFEI eliminates erroneous encoder pulse counts caused by uncontrolled backward movement, and counts forward pulses until reverse motion occurs. It then stops counting pulses (reverse or forward) until encoder position exceeds the last forward position before reverse.
For example, when a web process stops, some backward movement will occur. Upon re-start, the process will overlap a portion of the web, resulting in mis-registration. The NFEI counts pulses until reverse occurs, then withholds pulses until the exact point the process stopped, resulting in perfect registration! If the process stops halfway through a character, the character will be finished when the process restarts. Scrap is eliminated and downtime is reduced.
The new NFEI works with standard quadrature encoders.
- Web Processes
- Bar Codes
- Wire & Cable Cut-Off
- Labeling & Packaging Equipment
- Any application requiring absolute registration