Most incoming and outgoing transactions to your Peso wallet affect your daily, monthly, and annual transaction limits. Converting funds to your PHP wallet will affect your transaction limits.
Converting BCH to PHP will affect your Coins.ph PHP cash in limits (because funds are going into your PHP wallet). However, converting PHP to BCH will not affect your limits.
Sending and receiving BCH between your Coins.ph BCH wallet and other Coins.ph BCH wallets or external BCH wallets will not affect your limits.
For more information on transactions that affect your limits, see here.
To learn more about daily, monthly and annual limits, as well as increasing your limits, see here.