Pick and Hold Unit
Not only does the new Pick and Hold Unit (PHu-ANA) module from Geeplus help the user to optimize excitation conditions for a solenoid device, in situations where large numbers of solenoids are being tested, serious cost savings in terms of labor, equipment and energy can be achieved by fulfilling the functions of a PWM current regulator and oscilloscope.
How Do Geeplus Control Circuits Save Money?
The PHu-ANA adds to the capabilities of the basic PHu module by providing a clear, graphic display of the excitation current waveform. This enables the user to calculate the precise excitation current conditions to achieve the required force or speed, with minimum power consumption and heat dissipation.
The PHu-ANA kit allows the user to define ‘pick current’, ‘pick time’, and ‘hold current’ parameters for the excitation of the device being evaluated. The display shows the spike where the solenoid armature hits the end stop (stroke time) followed by typical bounce and settling. When setting up parameters, the solenoid can be switched ‘on’ or ‘off’ from the PC. The ‘Start-2s-Stop’ button energizes the device for only 2s, which provides a degree of protection for small devices which can overheat rapidly.
The test data shows the achieved current values, and the duty cycle of the PWM current control in the Pick and Hold conditions. It also provides some limited diagnosis of problems, such as inadequate current capacity of the power supply. When switched on for long periods, the screen also shows the duty cycle of PWM control, and the junction temperature of the power device in real time.
The ability to test solenoids in this way enables the user to ascertain that they are using exactly the right device for their project, which can create savings in terms of size, weight and money.
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