Brother International MD-817 Service Manual - Page 44

high-pitched

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C NOTES REGARDING DC MOTOR INSTALLATION (1) Be sure, when using a three-phase power supply, to check the connection of the power plug. Be careful not to use a single-phase power supply. Even if a single-phase is used, there may be no abnormal condition. Note, however, that quick repeated starting and stopping will cause the fuse to fail. (The fuse interior will not become black.) (2) The power supply voltage should be ± 10% of the rating. (3) Securely connect each connector. The 6-pin connector from the motor is, in particular, very important. (4) If single-phase 110V is used, all functions will stop if there is even a momentary drop of the voltage to 75% or below. For that reason, indoor wiring capacity should be 20A or higher, and the use of extension cords should be avoided. (5) For cold regions, care should be taken to avoid condensation. In particular, needle (lower) stop position will be abnormal if condensation occurs on the reflector plate of the synchronizer. (6) Needle (lower) stop position will be abnormal if there is oil or grease on the reflector plate of the synchronizer, so if there is any it should be carefully wiped off. (7) Avoid use near any equipment, such as a high-frequency welder, etc., that emits high-pitched noise, because such equip- ment will cause operational errors and/or damage to the D printed-circuit board (fuse failure). (8) For a three-phase power supply, if a voltage 130% or higher than the rating is applied, the fuse will melt (fuse interior becomes black), thus protecting the control circuitry. - 40 -

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C
NOTES
REGARDING
DC
MOTOR
INSTALLATION
(1)
Be
sure,
when
using
a
three-phase
power
supply,
to
check
the
connection
of
the
power
plug.
Be
careful
not
to
use
a
single-phase
power
supply.
Even
if
a
single-phase
is
used,
there
may
be
no
abnormal
condition.
Note,
however,
that
quick
repeated
starting
and
stopping
will
cause
the
fuse
to
fail.
(The
fuse
interior
will
not
become
black.)
(2)
The
power
supply
voltage
should
be
±
10%
of
the
rating.
(3)
Securely
connect
each
connector.
The
6
-pin
connector
from
the
motor
is,
in
particular,
very
important.
(4)
If
single-phase
110V
is
used,
all
functions
will
stop
if
there
is
even
a
momentary
drop
of
the
voltage
to
75%
or
below.
For
that
reason,
indoor
wiring
capacity
should
be
20A
or
higher,
and
the
use
of
extension
cords
should
be
avoided.
(5)
For
cold
regions,
care
should
be
taken
to
avoid
condensation.
In
particular,
needle
(lower)
stop
position
will
be
abnormal
if
condensation
occurs
on
the
reflector
plate
of
the
synchronizer.
(6)
Needle
(lower)
stop
position
will
be
abnormal
if
there
is
oil
or
grease
on
the
reflector
plate
of
the
synchronizer,
so
if
there
is
any
it
should
be
carefully
wiped
off.
(7)
Avoid
use
near
any
equipment,
such
as
a
high
-frequency
welder,
etc.,
that
emits
high-pitched
noise,
because
such
equip-
ment
will
cause
operational
errors
and/or
damage
to
the
D
printed
-circuit
board
(fuse
failure).
(8)
For
a
three-phase
power
supply,
if
a
voltage
130%
or
higher
than
the
rating
is
applied,
the
fuse
will
melt
(fuse
interior
becomes
black),
thus
protecting
the
control
circuitry.
-
40
-