Dear sir

I have used my plant 6RA70 drive 400V,600A .In CUD card two number of analog outputs used for actual speed metering  and field current metering. I need to monitor actual current using analog outputs but I didn't found third analog output in my CUD. I found that prior to analog output the CUD terminals 12,13 are configured as actual current, how to use and what is the range of ammeter I have to connect.