upsConfigOutputFreq 1.3.6.1.2.1.33.1.9.4

The nominal output frequency. On those systems which support read-write access to this object, if there is an attempt to set this variable to a value that is not supported, the request must be rejected and the agent shall respond with an appropriate error message, i.e., badValue for SNMPv1, or inconsistentValue for SNMPv2.