Magnetic Sensor Systems

Solenoid Driver Module
Pick and Hold Module SDM840

One method of consuming less energy is to apply a voltage to the solenoid coil to provide the necessary force to pull the plunger in, then, when seated, drop the voltage down to a level sufficient to maintain the plunger in a seated position. (See example in Minimizing Unnecessary Energy Consumption ; Voltage Reduction.)

MSS' Pick and Hold Module is designed to apply an initial higher voltage to the coil for a pre-determined period of time and then drop the voltage to a pre-determined percentage of the initial value through pulse width modulation to avoid over heating the solenoid coil.

The above voltage sequence will be applied to the coil when a voltage (2 to 40 VDC) is applied to the trigger. The trigger voltage can be a secondary voltage (external trigger) or the same voltage used for input voltage (internal trigger).

This is particularly useful when a solenoid requiring a relatively large amount of power needs to be turned on and off with a low power trigger voltage such as a TTL compatible signal.

Solenoid Driver SDM840
Solenoid Driver SDM840 Dimensions
Parameter Min Typical Max Units
Supply Voltage 8 40 VDC
Peak Current (During Pick Time) 20 A
RMS Current 3 A
Command (Trigger) Range 2 40 VDC
Command Input Resistance 50   KOhms
Operating Temperature 0 80 Deg C
Storage Temperature -40 125 Deg C
PWM Frequency   20   KHz
Pick Time   100*   mSec
Holding Voltage to Supply Voltage Ratio   30**   %

* Pick time can be made longer in factory on special orders. 100, 250 and 1000 millisecond pick times are readily available.

** Holding voltage is preset in factory at 30% of input voltage. This value can be adjusted with the potentiometer on the board.

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Rev. 01-01-05