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.


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.             

** 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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Copyright   2002-2005

Rev. 01-01-05