Power supply via JST PH2.0-4Pin /How to..

Hi there..

I need to power my LP3 DELTA via JST PH2.0-4Pin.

Why there are two pairs of + and - (its a backup or what)? Will be my LP working even if I connect only one pair of + and - ?

If no, do I need to connect two separate adaptors (like this one) or I could use only one power source (like this one) and use separate outputs from the source?

Thanks in advance.

Best regards

Adam