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MOV I.D. Help please

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elektroda.net NewsGroups Forum Index - Repair Electronics - MOV I.D. Help please


Guest

Sun Feb 02, 2020 2:45 am   



Hey All,
I have a lathe with a FUJI-FRENIC Spindle Drive. The machine dates
from the lathe 1980s. Today there was a big power surge and one of the
3 MOVs on the input for the drive exploded. A "Super Rapid Fuse", also
made by Fuji, blew too.
I cut off the bad MOV, replaced the fuse, and the drive works
again. Yay for MOVs and Super Rapid Fuses.
But I can't find the data for the MOV so I can buy a new set of 3.
There are 2 MOVs left in the drive that can be read, the exploded one
is completely unreadable. The marking on one MOV is ENB401 40. The
other one is marked ENB401 48. I looked at the markings and there is
no mistake, one is marked 40 and the other 48. The way the MOVs are
mounted in the drive makes it obvious that they were installed as a
set. 3 MOVs and 3 capacitors have their leads crimped together into
lugs so that the whole assembly can be mounted to 3 screws on the
terminal block that holds the fuses.
Looking for datasheets all I can find are ENB401D numbers with
other numbers that follow the ENB401D characters. So I just don't know
how to cross reference what I have to what is available now.
Apparently the diameter of the MOV is important as part of the rating.
Mine measure 16MM but that is measuring over clear heat shrink so I
think the disc inside is actually 14MM.
Can anybody here help? Please?
I can run the machine without one of the MOVs but I am reluctant to
do so, especially because of the weather we are having that is causing
the power outages and surges.
Thanks,
Eric

whit3rd
Guest

Mon Feb 03, 2020 1:45 am   



On Saturday, February 1, 2020 at 5:14:51 PM UTC-8, et...@whidbey.com wrote:
Quote:
Hey All,
I have a lathe with a FUJI-FRENIC Spindle Drive. The machine dates
from the lathe 1980s. Today there was a big power surge and one of the
3 MOVs on the input for the drive exploded.
The marking on one MOV is ENB401 40.


It just needs to outlast the fuse, so the exact ratings aren't too important.
Assuming 220V three phase, just about anything in this list will do the task.

<https://www.digikey.com/products/en/circuit-protection/tvs-varistors-movs/141?k=MOV&k=&pkeyword=MOV&sv=0&pv2151=u250V&sf=1&FV=-8%7C141%2C16%7C339262%2C16%7C339263%2C16%7C339265%2C16%7C339266%2C16%7C339267%2C1989%7C0&quantity=&ColumnSort=0&page=1&pageSize=25>

There's also the NTE resource to find equivalents, <https://www.nteinc.com/search.php>
which suggests a replacement part, but that part number was an old Fuji one, and not
really available nowadays (except 'new-old-stock' at outrageous prices).


Guest

Tue Feb 04, 2020 2:45 am   



See page 13.

http://www.grandpas-shack.com/parts/datasheets/ENB(FUJI).pdf

The last 2 digit are a lot number.

The part number suffix is related to the diameter of the disc.

ENB401D-10A -> 13mm
ENB401D-14A -> 17mm
ENB401D-20A -> 24mm


Guest

Tue Feb 04, 2020 9:45 pm   



Thanks fo the replies Gents. I have ordered replacements.
Eric

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