Is this a Chinese drive? I have seen a lot of strange nomenclature on
Chinese drives.
M in a German sense, oftentimes denotes "mana" which is a common. I
have seen M or "mana" used to denote a low voltage common. So does the
M in DCM, stand for "mana"? Perhaps? Perhaps the drive was designed by
a German engineer?
I try to look at the example wiring diagrams as those seems to be fairly
consistent even though the nomenclature is often not.
A neutral connection should not be required.
Since you are in the US and likely on a 240 single phase residential
service, so you likely just have two hot legs which is 240/250 volts,
and those would connect to the drive along with the safety ground.
I would think that your drive manual should have a resistor
recommendation for the dump resistor. Or maybe not?
A dump / braking resistor is only required if you want to stop the motor
quickly.
Dave
On 12/22/2020 6:23 PM, Gene Heskett wrote:
Greetings all;
Swapping a 110 volt vfd, for a 250 volt vfd, one of the terminals is
labeled differently, the common point of the fwd/rev/spd1-2-3-4-5
terminals on the 110 volter is labeled XGND
But the common point terminal on the higher voltage unit is labeled DCM
but the diagram of how to hook up external controls is identical.
Is there any good reason to treat it differently in hooking it to a
7i76D? It should all be equ as its the presence of continuity from the
fwd/rev terminals to this XDNG/DCM common point that determines the
command.
There is no terminal labeled neutral on this controller, only a marked
static ground which I ran back to the services static bar, not to the
neutral bar. But my copy of the NEC is now 24 years old, so I'm asking,
hopefully, someone with a more recent copy.
This is also the first vfd I've had that actually has hookups for a dump
resistor. 2.2 kw vfd & motor, running on 250 volt single phase, what is
good value and wattage for this resistor?
Thanks folks.
Cheers, Gene Heskett
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
