More Maker Info
Minimum Debt Requirement is the amount of DAI that must be generated to open and maintain the Maker Vault. This minimum is a requirement, meaning any action would lead the vault to have less then 5000 DAI owed is not executable.
You can make partial payments to your Maker Vault as long as it maintains the minimum debt requirement. Most Vaults have a minimum debt requirement of 5000 DAI.
The Maker protocol has several dashboards that can help you understand the system's parameters, debt limits, rates etc.