I've been reading up on the system electronics recently and I'm a bit confused about the current settings for the drivers. I'm using AM882 drivers and 60BYG301B steppers from CNC4YOU. The steppers will be wired in parallel and the stepper data sheet lists the current for that configuration as 4.2 Amps - all well and good so far.

The problem is that the manual (I have) for the AM882 under "Connections to 8-lead motors > Parallel Connections" it says:

...Multiply the per phase (or unipolar) current rating by 1.96, or the bipolar current rating but 1.4, to determine the peak output current.

That seems to imply that I should set the driver to 4.2 * 1.4 = 5.8A (dip switch settings SW1 = On, SW2 = On, SW3 = Off gives 5.5A or set exactly using ProTuner). That feels wrong to me though. I think the AM882 manual is assuming that the stepper data sheet will give the RMS current but it's not clear from the data sheet if that is the case.

What I think I should do is use ProTuner to set the peak current to 4.2A as the nearest dip switch setting is SW1 = On, SW2 = Off, SW3 = On which only gives 3.6A. Sound right?