I'm not a 100% on when a margin call is on a group of future contracts... The contract attributes were:
Initial Performance Bond: $1,980 Maintenance Performance Bond: $1,800 Contract size: 12,500,000 ¥ Future Foward Rate: $110.10
I needed to hedge ¥1,760,850,300 so therefore the number of contracts are 141(1760850300/12500000=141 contracts) which converted to USD is $16008174.38 .
The initial performance margin is $ 253,800 so a margin call would occur at when the account hits or falls below
Attached below is a screenshot of my current chart for the past week if that helps a bit more.