(
r
Specifications
2.8 Maximum Power Losses
Maximum
Watts
Loss
DM-10
50
+ dissipative shunt
DM-20 100 + dissipative shunt
DM-30 150
+·dissipative ·shunt
3
kVA
Transformer
(1
Phase)
350
DM-25 120
DM-50 180
DM-100 275
DM-150 300
DM-150X
350
PSM-50 110 + d i
ss
ipative shunt
PSM-125
240 + dissipative shunt
3
kVA
transformer (3 Phase)
350
6
kVA
transformer
(3
Phase)
600
12
kVA
transformer (3 Phase)
950
18
kVA
transformer
(3
Phase) 1200
The maximum
power
losses are shown
to
help
in
sizing a NEMA 12
(o
r equivalent) enclosure and
any
required ventilation. Typical
power
losses are
about
one-half maximum
power
losses.
As
an
additional aid
in
sizing
an
enclosure with no active method
of
heat dissipation,
the
following
approximate equation is used:
T = 4.08*(0/
A)
+ 1.1
where T is
the
temperature difference between inside
air
and outside
amb
ient ("
F)
, Q is heat generated in
enclosure (watts),
and
A is enclosure surface area (tt2). The exterior surface
of
all six sides
of
an
enclosure
is
calculated as:
A =
(2dw
+
2dh
+ 2wh)/ 144
where d (depth), w (width), and h (hei
ght
) are
in
inche
s.
BRU-200
/B
RU-500
Bru
sh
l
ess
Drives Instruction Manual
9
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