Another Bill here.
If you really need the series field, I put them on the DC side of a suitable bridge rectifier. Connect the AC side in series with your armature. The amp rating needs to be well above the full load current of the motor.
As thermite Bill indicates that you probably don't need to use the series field anyway.
Bill
I'd probably want to find a way to utilize it on a "1Q", AKA first quadrant, contactor reversing AND NOT not Thyristor reversing drive.
The WiaD and Modular, as well as a Eurotherm/Parker-SSD 512C series or a Beel/BICL D510 are all 1Q, contactor reversing. They just do not "do" over-run management nor regeneration, so:
A) They are more in need of compensating/compounding assistance.
AND
B) They can work with sync'ed contacts to reverse the S1, S2 connections, just as other contacts reverse A1, A2. The drives are blind and indifferent to what the contactors & relays have been asked to do, but they do exist.
For 4Q, drives, there ARE NO contactors or relays. Analog or Digital Logic switches the SCR's dynamically to change direction or brake. Even zero-point control is an active process.
The 4Q, four quadrant, fully regenerative drive, such as the 514C-16/32, the drive can be sort of tap-dancing between FWD, idle, REV very rapidly to manage ramp up/down, braking, over-run (NOT) on coast, changes in load, and
enforcing "zero speed".
Kinda neat, BTW, that a
single knob does FWD & @ RPM, OFF/BRAKE/CREEP, REV & @ RPM, and why I wanted mine on the carriage, not the HS.
The electromagnetic effect, nor the "inertia" of the supplemental coil on S1,S2 is
not "externally managed", dynamically, as the 4Q drive is. It won't have the same effect at all times or under all circumstances, nor the same level of interaction with the more dynamic drive.
Ergo it is probably best to leave electromagnetic compensation out of the game in the interest of better stability, all RPM & loadings.
There'd be less risk of conflict / reinforcement and resonances, EVEN IF.. it might be helpful under SOME RPM & loadings.
That isn't so much a FWD/REV issue, after all.
It IS akin to not wanting more than one entity flying an aircraft, each blind to the other's capability or intentions in the moment, not communicating, ergo sometimes opposing, sometimes aiding, other times indifferent, and always "If don't know I'm not the only player, I am UNABLE to cooperate except by accident".
That cooperation would have to be designed-in, and we aren't in the right place or time to do that with the "stock" 1-P only drive we have.
OTHER DC Drives, 3-Phase input ONLY?
Lots of goodies in
their ar$enal$, 24-pulse included.
Just bring money. And utility-mains-grade 3-P, of course!
2CW
BTW: MY 3 HP Reliance small frame utilized a tachogenerator. The SSD drive can handle that. Field weakening, OTOH, neither Mark nor I have yet had need, nor time to research and sort beyond Shackleton having had a Field Regulator that mated to the prior generation of DC Drives to the 514C.
Absent that cooperative Field Regulator, using the tach simply denies field weakening RPM boost by dropping Armature power to offset it!!! Catch 22.....