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Electronic Component Basics



Functionality

Trombetta's electronic controls for industrial work solenoids control the magnitude of electrical drive applied to the coil during the pull-in and/or hold operation of the industrial work solenoid. All use Pulse Width Modulation (PWM) switching to achieve high operating efficiency. The particular methodology underlying the PWM scheme is what distinguishes the various families of industrial work solenoid controllers. Those distinctions are addressed in the section Electronic Control Families Features and Benefits. Feature enhancements may be incorporated into any of the controls to create a customized solution.

All Trombetta designs are robust, utilizing high quality components throughout, with considerable transient voltage suppression designed into each and every model.

All Trombetta electronic controls are designed with the same ultimate benefit of allowing the use of smaller industrial work solenoids than would otherwise be needed to generate the force necessary to perform a particular job. Smaller industrial work solenoids provide the end product designer with more mechanical design flexibility. The use of the controller maximizes the cost effectiveness of the industrial work solenoid while providing the often overlooked benefit of eliminating the need for more costly and fragile dual winding coils. A single coil under PWM control utilizes 100 percent of the winding at all times resulting in higher efficiency and cooler operation.

Trombetta's engineering team has decades of experience in both disciplines of industrial work solenoids and electronic controls affording our customers industrial work solenoid/control system designs that work together to optimize performance, size and cost.



Electronic Controls Application Guidelines

Trombetta has learned that the following pieces of information are usually needed to correctly suggest electronic controls. If you are unsure of some of your application parameters, Trombetta engineers will help you in defining your system. Several standard electronic controls are available or Trombetta can design a custom unit to meet your specific needs.

1)  What is the system operating voltage and operating voltage range?
•  Consider not only the nominal but also the absolute high and low voltages under which the control must operate within the specification.
•  Are there extreme voltage conditions under which the control is not required to operate within specification, but is required to endure the conditions then recover and operate within specification?

2)  Are separate initiate controls needed or will primary power be switched?
•  If separate initiate controls are required, what control voltage will be used?
•  Is there need for more than one control input? (i.e. Will initiate be controlled through Boolean logic applied to multiple inputs?)
•  Is optical isolation of the control input(s) required?
•  Are there any control signal protocol issues?

3)  Is a single or dual action industrial work solenoid being controlled?
•  It is usually more economical to control both coils of a dual action industrial work solenoid with a single control equipped with dual outputs.

4)  Is it a pull only or a pull and hold application?
•  For applications with hold requirements, the hold force requirements and industrial work solenoid selection will need to be known to analyze the control system performance under all operating conditions.

5)  What is the required pull time?
•  The most extreme voltage and temperature conditions plus any mechanical factors that might affect solenoid and mechanism reaction time must be considered to accurately determine pull time.

6)  What is the ambient operating temperature range?
•  Be sure to consider not only the nominal conditions, but also the absolute high and low temperature conditions under which the control will be required to operate within specification.
•  Are there extreme temperature conditions under which the control is not required to operate within specification, but is required to endure the conditions then recover and operate within specification?
•  Are rapid temperature excursions expected (thermal shock)?

7)  What is the maximum operating rate and duty cycle requirement?
•  What is the maximum sustained on time?
•  What is the maximum sustained rate of on/off cycling?
•  Are any short duration bursts of on/off cycling anticipated? If so, characterize them.

8)  Are there any special considerations?
•  Regulatory standards or agency certifications?
•  Size or location restrictions?
•  Unusual operating conditions?
•  Shock, vibration, EMI, radiation?