I have a 15hp 3-phase motor on a 50A 120/208 wye circuit. I also have a small 1A dc motor with controller and some monitoring circuits - this secondary system needs 24vdc and 1.5A altogether. I have an ac-dc converter that's rated up to 240VAC and about 1A input current to provide the DC power.
Is it safe to wire the converter with the incoming 3-phase for the motor? I figure since the starter coil is using L1/L2 I can connect the ac-dc unit to L2/L3 and have a balance on the 3 legs. The motor runs for a max of about 1hr continuously, it's fla is 39A. Most of it's operation is for short durations - about 10min at a time.
If this is acceptable are there any extra precautions other than fusing the secondary unit? Also, in case the large starting current cuts the DC power, what would be a good solution to avoid the voltage dips besides a large capacitor?