Protection circuit trubles with SBL1360 and 48V battery pack, at the start-Up

2 years 11 months ago #29533342 by manuelebonaccorsi
Dear Forum mates and Roboteq expert
I am designing a 4-wheel robot and I have selected the SBL1360 driver for my 48V engines. I followed the SBL13xx data sheet to connect the battery pack (48 V) and the four controllers. In particular, I replicated the fig.9 circuital solution for each driver, and I used a single relè (Solid state 60V - 40A) to rule the power circuit. Unfortunately I burned 4 times this relay driven by the security button (mushroom button).
In particular, the relay seems to burn at the start-up when I connect the cables of the battery pack to the circuit, becouse I alway see sparkes (even when the relay is off).
Please, can someone support me in the selection of a proper reley or a proper way to connect the battery pack to the circuit?
Thanks in advance for Your time.
Sincerely.
Manuele

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2 years 11 months ago #29533353 by blake
Are you using the 1k, 0.5W resistor over your relay? This resistor will allow the large caps of the controller to trickle charge so you don't have a large inrush current when the contactor is closed. It is meant to prevent arcing on your switch as you are seeing.

Please refer to page 27 of our User Manual for further details.

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2 years 11 months ago #29533364 by manuelebonaccorsi
Thanks for the reply :-)
Yes, but a 0,5K resistor. Actually the relay drives all the four drivers. This could be an issue for the electric arch generated by the charging current of the four drivers.
I'm now ordering an anti-arch devices to put in paralele to the relay, hoping to improve survaivability.
I'll also try to set a real 1K resistor to fit the datasheet properly.
Thanks.
Manuele

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