lvlav.
31 2012 9: 24Al\4
No,
1530
P
59
Page 56
GONVERSIONS
VMD
The VMD
{Vacuum
Circuir
Bresker Monitoring Device}
is a device used to
monitor
the clrcuit
breeksr
during
a ctoiing oparetlon lnhiated by an
alactrical eignal and will trip
the circuit blEaker open $hould
a dow or incorhplete clo$ing
operation occur.
Tlts rafEty
davlcE rhould be
lnstslled on any TorHba
clrcuh breaker udlked ln
a corwerslon that uses the
mAifi
Opeflidg-Closing $haft
for
any
porpos€8
other dlen
the mrmal open+lose oparadon
or 1fie oFeradon ol a Toshlba
MOC.
lTWmil
Do not
ovcrload
rhe
circuit breaker operatlng mechanlsm,
Slow or lncomplete
oloslng
of dle clrcult
bteaket can oau9e
fire
Nfid explotion,
retulting in aavsla injury, d6ath
8nd
plopitty
damege.
The
VMD monitors ths
pedormance
of the
circuit breaker dutlng the
closing
operation from an
elecric€l signal.
lf the circuit breaker faile
to cloae within lOomsec after
an electrical closing Sigttal
hag been
sent, the
VMD will
send an electrioal
signal to
a sscondary trip coil.
This coil will trip the
chcuit breakar open at any
physical poinr
of rhe closing operation
and
r€l€as€
any en€tgy
stored
in
the
claiing
springs, thus rEducing tha chancEs
of o serious electrical
failute.
Once the
vMD has
performed
o tripping opararion,
it will eut the control circuit
powe/
to the charging
motor thus
preventing
the closing
springs
from
being
rachatged. This
will tandBr the c:rcuit breaker
temgorarily
inoperable. The VMD will reset automatically
only
sftsr
the
control
circuit
powBr
has bssn
idterru
pted
.
An
indicating ligh thar
prorrudes
elightly through
tho circuit breaker
lront cover
will
be
illuminated
if rhs
VMD h€8
p€rform€d
a trlpplng op€ration.
Should the VMD trip the circuh breaker
open, the circuit breakel
must
be
removed from
service
and
a thotough
inspection made
to determine
lhe
cause
of tha elow or incomplete
closing of the circuit
br6akor. The cause of
the slow or incomplete closing
mu$t
be correctsd
bdfore
placing
tho circuit
bro|ker
back in servica,
Do not lesct thc vltD or
attemDt circuit bfeaker
op€mtion
o,
i
comFlete
cloling has baan
determlned and corrected' Fallule
to do
untl
th6 cauaa of dow
$o oan Cluse
fire
and
exploslon.
r6dtirrg
ln
$evse
iniury,
detth anal
ptopafty
damagc'
Refer to the VMD
manual
GF077690
for more intormation
ragarding opetEtion and maintenance'