If the salt-minion is not currently running on the server you can still run salt-run commands from the command line that will communicate with the salt-master.
All salt-minion versions
This is how the product is designed to work. The salt-call command is in effect a salt-minion running while the salt-call command is executing. This is to say that, the salt-call command communicates with the salt-master directly and does not need the salt-minion on the server to be running to function properly.