Hello,
I’d like to ask a question to clarify voltage input on the VM188. The documentation states this module is good for 12-24VDC input, however when looking at the relay datasheet (HF115F-I) I see the nominal voltage is 12V which allows only a maximum of 18V. I’m assuming that the VM188 schematic has some components to limit max power into the relay coil, but wanted to ask to confirm this before using 24V on the input to the VM188.
Search for the MK188 then download the assembly manual.
You will find the schematic in there.
Or click on this link to find the manual.
http://www.vellemanusa.com/support/downloads/?code=MK188
Thank you for the quick response. From the schematic, it looks like you’ve got a current driver with transistor T1, so current through relay should be independent from supply voltage (assuming LD1 is 2V drop, circuit is setup for ~30mA). This answers my question, thank you!
No problem.
Enjoy