Brother International MD-817 Service Manual - Page 10

Configuration

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CONFIGURATION trd et& W o PLQ P Bea& Synchronizer 01/03mm Source DC. Servo motor Fuse Treadle Power supply Full-wave rectification -ass circuit Protective circuit Power transistor POWER CIRCUIT UNIT _.J Transformer r Power supply circuit 4, Power ON-OFF detection L 1 Motor drive circuit IPWM) Power supply cir uit Power ON-OFF detection Look protective circuit L_ Brake Operation panel CPU Speed detection Solenoid brake transistor CONTROL CIRCUIT UNIT Note: The sections enclosed by the broken line indicate where high voltage is applied. Handle these sections with great care. CAUTION: 1. When setting down the machine head or touching the needle, be sure to turn off the power switch and confirm that the pilot lamp is OFF. 2. Ground cables are provided for both single-phase and three-phase types; do not fail to ground the motor. (A ground cable is not provided for single-phase 110V types. Be sure to ground the motor frame if necessary.) 3. When adjusting the controls in the control box, be sure to turn off the power switch, remove the front cover and confirm that the pilot lamp is OFF. "It is dangerous to handle the control box when the power is on because high voltage is applied. Handle with great care. 4. Do not use the DC servomotor near machines which generate strong highe frequency electrical noise, e.g., arc welders.

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CONFIGURATION
Synchronizer
trd
et&
o
PLQ
P
W
Bea&
DC.
Servo
motor
01/03mm
Source
Fuse
Power
supply
Full
-wave
rectification
—ass
circuit
Protective
circuit
POWER
CIRCUIT
UNIT
Power
transistor
Trans-
former
r
_.J
Brake
Power
supply
circuit
L
4
,
Power
ON
-OFF
detection
Treadle
Power
supply
cir
uit
Motor
drive
circuit
IPWM)
1
Power
ON
-OFF
detection
Operation
panel
Speed
detection
CPU
Look
protective
circuit
L_
Solenoid
brake
transistor
CONTROL
CIRCUIT
UNIT
Note:
The
sections
enclosed
by
the
broken
line
indicate
where
high
voltage
is
applied.
Handle
these
sections
with
great
care.
CAUTION:
1.
When
setting
down
the
machine
head
or
touching
the
needle,
be
sure
to
turn
off
the
power
switch
and
confirm
that
the
pilot
lamp
is
OFF.
2.
Ground
cables
are
provided
for
both
single-phase
and
three-phase
types;
do
not
fail
to
ground
the
motor.
(A
ground
cable
is
not
provided
for
single-phase
110V
types.
Be
sure
to
ground
the
motor
frame
if
necessary.)
3.
When
adjusting
the
controls
in
the
control
box,
be
sure
to
turn
off
the
power
switch,
remove
the
front
cover
and
confirm
that
the
pilot
lamp
is
OFF.
"It
is
dangerous
to
handle
the
control
box
when
the
power
is
on
because
high
voltage
is
applied.
Handle
with
great
care.
4.
Do
not
use
the
DC
servomotor
near
machines
which
generate
strong
highe
frequency
electrical
noise,
e.g.,
arc
welders.