From the ap-515 datasheets...
- disable IPM on 802.3af is not supported!
When powered by 802.3af (class 3) PoE and with the IPM feature enabled, the AP will start up in unrestricted mode, but it may apply restrictions depending on the PoE budget and actual power. What IPM restrictions to apply, and in what order, is programmable.
• Operating the AP with an 802.3af (class 3 or lower) PoE source and IPM disabled is not supported.