How is the pledge invoked if the loan is not repaid?

How is the pledge invoked if the loan is not repaid?

The pledgee (i.e. bank) may instruct the DP to invoke the pledge by submitting Invocation Request Form (IRF). On execution of this instruction the securities are moved from the pledgor’s account to the pledgee’s(bank) account. Invocation does not require any confirmation from the pledgor. Pledgor is informed of the movement of the securities by his DP i.e. Jainam.