AXYZ Retrofit - VFD / AC Inverter electrical

This isn't a linuxcnc-specific question, more of an electrical/wiring question. The CNC router I am retrofitting has a Woods E-Trac X2C AC inverter powering/controlling the spindle. As I'm re-wiring the machine for my Mesa card & LinuxCNC, I'm trying to make sense of the existing wiring.

The machine is (and was previously) powered by single phase 220V (i.e. North American residential standard). The AC inverter/VFD manual states that either single or three phase wiring can be used. The manual states, "incoming power leads L1, L2, and L3 must run through the ground fault CT before being fastened to the terminals... If operating with single-phase power, use line terminals L1 and L2."  However, on my machine, L1 and L2 do not pass through the current transformer. Instead, there is an Ogden Mighty watt resistor (MXEG03A1493, 250Ω, 400V) wired to some undocumented terminals on the inverter (under the cover) and these leads pass through the current transformer. Can anyone speculate on why this might have been done?

The manual covers dynamic braking on page 88. You might need to contact Woods for resistor wiring info.
Here is the link.
     s3.amazonaws.com/Icarus/DOCUMENTS/TBWoods_Manuals_1214.pdf 

file too large to attach.

I really appreciate the insight. I initially thought it might be a brake resistor but the 'dynamic braking package' on page 88 is only listed as an option for the larger 7.5-20HP inverters whereas this is a 5HP model. I've put in a request with TB Woods and Vacon but this is a 12 yr old, discontinued and obsolete product...