NRI PIS bank account is a repatriation account. This account is designed to invest NRI foreign earnings in India. Every transaction in this account is reported to RBI. You should not use this account for any other purposes except investment on a repatriation basis.
To invest out of borrowed funds from India, an NRI could use NRO bank account. The NRO bank account is designed for NRI investment in India on a non-repatriation basis. Transactions in this account are not reprinted to RBI. This account is used commonly by NRIs to receive earnings in India like rental, pension etc.