/
INSTRUCTIONS
HEAT$INK
P_Lm_mRYD_.K-24991
REPAIR AND REPIACEMENT
DC-3062
POWER CONVERSION
SMALL
MEDIUM
for
MODULE
LARGE
THREE PHASE FULL WAVE
These instructions do not purport to cover all details or variations in equipment nor to provide for every possible conttngency to be met in connection wtth
installation, operation or maintenance. Should further information be desired or should particular problems arise whtch are not covered sufficiently for the
purchaser's purposes, the matter should be referred to the General Electric Company
GENERAL
ELECTRIC
WARNING
HIGH
VOLTAGE.
ELECTRIC
WHETHER
THE AC
TO GROUND
WILL
SMALL
1.
POWER
With
CONVERSION
Stud
Mounted
To replace
follows:
SHOCK
CAUSE
SERIOUS
a stud
MODULE
mounted
SCR
in
the Conversion
b.
Remove
Conversion
c.
Remove
fan bracket
d.
Remove
the front
e.
Remove
printed
f.
Take
g.
Remove
the
2 nuts
securing
the heatsink
h.
Remove
the
failed
SCR
the
i.
Clean
cloth.
j.
Apply
a thin coat of General
equivalent
thermal
compound)
surface.
heatsink
Install
Module
and
Reassemble
With
To
Press
replace
Pak
to the
from
fan
cover
case
INJURY.
from module,
the module.
circuit
card
cover
assembly
from
its'
with
from
at the
the
in which
if a fan
heatsink
mounting
as
the Conversion
is supplied.
assembly.
bracket.
with
the
failed
SCR.
heatsink.
orientation
and
proceed
surface
with
a lint-free
Electric
G322L VersalubeePlus
(or
to the replacement
SCR mounting
Tighten
the module
from
SCR mounting
same
Module,
case.
from
heatsink
SCR
circuits
original
assembly.
to 30 in. lbs.
1.
FATAL
SCR's
Open all electrical
Module
is located.
the
OR
(DC-3062)
a.
k.
2.
CAN
VOLTAGE
SUPPLY IS GROUNDED
OR NOT, HIGH VOLTAGES
BE PRESENT AT MANY POINTS WITHIN
THE SCR DRIVE.
the SCR
reinstall
of
stud
it
its'
nut
in the
leads
with
as
in the
a torque
wrench
case.
SCR's
a Pres
Pak
SCR
a.
Open all electrical
Module
is located.
b.
Remove
Conversion
c.
Remove
fan
bracket
d.
Remove
the
front
in
the
Conversion
circuits
Module
and
cover
to the
from
fan
from
case
case.
from
module.
the module.
2
* Registered Trademark of General Electric Co., U,S.A.
Moduletproceed
in which
as
follows:
the Conversion
e.
Remove
printed
circuit
f.
Remove
Heatsink
g.
Remove
SCR.
the
h.
Remove
failed
i.
With
assembly
2 nuts
a soft
card
from
cover
from
from
its'
heatsink
mounting
the heatslnk
clamp
assembly.
bracket.
containing
the
failed
and
both
SCR.
lint-free
cloth
heatsinks
where both the
Inspect
all SCR mounting
clean
the
aluminum
plate
failed
SCR and the good SCR mount.
surfaces
to make sure they are smooth.
j.
Apply a small dab of General
Electric
G322L Versalube
Plus
(or
equivalent
thermal
compound)
to each side of the two SCR's being
installed
so that under pressure
the compound
will cover only
the raised
center
SCR surfaces.
k.
Place
the
assembly.
1.
The
the
Check
n.
With
are
to
the
Reassemble
the
see
the
nuts
alternately
2-1/3
turns
o.
SCR's
in the
clamp parts
should
two nuts tightened
showing
m.
two
same
cell
finger
in 1/4
each.
orientation
be assembled
finger tight
on
both 'clamp
holes
tight
turn
the module
same
are
use
steps,
and
the
original
in the original
manner
and
so that the number of threads
rods.
still
over
a wrench
until
reinstall
as
to
the
it
in
the
heatsink
tighten
nuts
the
have
case.
each
roll
nut
completed
pins.
WARNING
HIGH
VOLTAGE.
ELECTRIC
SHOCK CAN CAUSE SERIOUS
OR FATAL
INJURY.
WHETHER
THE AC VOLTAGE
SUPPLY
IS GROUNDED
OR NOT, HIGH VOLTAGES
TO GROUND
WILL
BE PRESENT AT MANY
POINTS WITHIN
THE SCR DRIVE.
POW CONV RSZON
ODL S(D0-306 ,
Pres
Pak
SCRUs
To replace
a Pres
Pak
SCR
in the
a.
Open all electrical
Module
is located.
b.
Remove
the front
cover
c.
Remove
the
transformer
assembly
pulse
with
the
Conversion
circuits
from
failed
to the
Module,
case
proceed
in which
as
follows:
the Conversion
the module.
card
(red
with
the
cover)
from
the
heatsink
SCR.
d.
Remove
the heatsink
assembly
e o
Remove
the
black
f.
Remove
the
2 nuts
g.
Remove
the failed
lint-free
cloth.
h.
Apply a small dab of General
Electric
G322L Versalube
Plus (or
equivalent
thermal compound)
to each side of the replacement
SCR so
that under pressure
the compound
will cover only the raised
center
SCR surfaces.
i.
Place
place
j.
The clamp parts should
be
two nuts tightened
finger
same on both clamp rods.
k.
Check
insulating
from
that
heatsink
SCR
from
from
the heatsink
clamp
containing
the module.
assembly°
the
failed
SCR.
SCR, and clean the heatsink
surfaces
with a soft
Inspect
the surfaces
to make sure they are smooth.
the SCR in the
the SCR center
to see
the
channel
failed
the
same
hole
orientation
as the original
over the heatsink
roll pin.
assembled
in the original
tight so that the threads
SCR center
hole
is still
over
assembly,
and
manner
and the
showing are the
the heatsink
roll
pin.
4
1.
With the nuts finger tight use a wrench
to tighten each nut
in 1/4 turn steps until the nuts have completed
2-1/6 turns
the 1/2" thick SCR or 2-1/3 turns for the 1" thick SCR.
m.
Reassemble
covers.
the
heatsink,
reinstall
it
in
the module,
and
alternately
each for
replace
all
WARNING,
HIGH
VOLTAGE.
ELECTRIC
WHETHER
THE AC
TO GROUND
WILL
LARGE
P,ONER .CONVERSION
The
Large
with
two
Power
SCR's
SHOCK
MODULE
Conversion
per
CAN
CAUSE
SERIOUS
OR
FATAL
INJURY.
VOLTAGE
SUPPLY IS GROUNDED
OR NOT, HIGH
VOLTAGES
RE PRESENT AT MANY POINTS WITHIN
THE SCR DRIVE.
(DC-,3062)
Module
contains
three
heatsink
assemblies
assembly.
In general,
factory
equipment
is required
to properly
replace
an SCR
in the large module heatsink
assembly.
Accordingly,
an SCR should be
replaced
by exchange
of the heatsink
assembly
containing
a bad SCR with
factory
supplied
assembly.
To
remove
a heatsink
assembly
in
the
Open all electrical
is located.
b.
Remove
c.
Remove
two
assembly.
bolts
d.
Disconnect
the
control
wire
e.
Remove
two
control
wires
f.
Hold the heatsink
assembly
in place and remove
washers
at each end of heatsink
assembly.
g.
Remove
h.
Remove
the plastic
sink assembly.
i.
Remove
the 3 control
leads
resistor-capacitor
cover.
j.
Reassemble,
the original
the
the
cover
in
the
near
to
assembly
cover
with the
heatsink
case
in which
proceed
the
as follows:
Conversion
Module
(air baffle).
to disconnect
heatsink
the
Module,
a.
the front
circuits
Conversion
a
by
ac
the
each
from
the
removing
at
replacement
assembly.
the
power
bus
ac power
SCR
and
frcm
heatsink
heatsink
heatsink
connection.
the
current
the
Conversion
6 screws
the
at
2 nuts
and
conical
Module.
the
assembly
assembly
transformer.
rear
that
used
of
the
heat-
connect
to
in place
of
the
GENERAL ELECTRIC COMPANY - DIRECT CURRENT MOTOR & GENERATOR PRODUCTS DEPARTMENt
ERIE, PENNSYLVANIA 113531
GEK-24991
(4/75)
GENERAL0
ELECTRIC
?