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DRV110EVM: Help energizing solenoid
Part Number: DRV110EVM
I am using a DRV110EVM board to energize a 24V solenoid to drive a cold gas thruster.
-JP1, JP2, JP3 close, JP4-9 open
-Pot R4, R5, R6 fully CCW
-Pot R3 fully CW
-24 VDC supply connected to P1-1 and P1-3
-Solenoid coil connected to P1-2 & P1-4
Solenoid coil type: Parker 12W 24VDC coil, 48 Ohms
I am trying to trigger the coil by applying 5V to TP3 (EN) using the NI MyRio run by a LabVIEW program. I cannot get any solenoid activation from the MyRio. However, the solenoid does fire randomly when JP2 is removed. Also, we blew the Pot R3 with too much current so we cut the zener diode in order to bypass that issue. Any clues on why the solenoid is not being controlled by MyRio?
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I would recommend that you add some notes in the user guide for the EVM board to start up this board with the R3 pot fully CW (higher R) to limit the supply current, and to never try to operate at fully CCW.
The user guide explicitly recommends starting with the R4,5,6 pots fully CCW, but nothing is said about R3. For a new EVM user it would seem logical to set R3 CCW also, but that will destroy the pot, the zener and the DRV110 chip, if the supply voltage is above the D3 zener voltage (20V).
This results in a buzzing or humming in the relay coil winding while attempting to command pulses using the ENABLE line, and other unexpected results due to the failed DRV110 chip.
In reply to kenneth house:
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