5-2. Memorybattery chargingmonitor LED(SC-320 only)
Zf n
i-
u
Fig.
5-10
o
If the sewingmachineis not operated for a long time, it can
lose charge,and LED 1may light.
When the LED lights, all the patterns in internal memory
are
lost.
If necessary, set the memory again.
However, this does
not
cause trouble in sewing, so continue
to
work.
<
For
reference
>
1. Time required to charge.
4 ~ 5 hours (enough for one day
of
operation)
2. Backup
period
Since semiconductors are used, the backup period varies according to the operating conditions.
It
is calculated as follows;
Standard : apprbx. 600 days
Worst case : approx. 6 days
Judging from the above results, the backup should last more than three months in an ordinary location.
5-3.
Motor
malfunction
detector
LED
INALYSIS A
LV.SW
J
57
A
JU6Z
I
TP3
TP4
1
08
LSV POV
J58
AMANU.C
M.CTL
PI46
The
LED
on
the
main
circuit
board
inside
the
front
cover detects overvoltage, overcurrent or low
voltage applied to the motor in sewing.
The explanation
of
each dectector LED is as
follows;
(I)
LD9
O
(MTL
3) (For H company's motor)
Whenthe overcurrent (more than 20A) is
continuouslyappliedto the motor for 100ms
or more, LD9,put the motor in an unenergized
state and then completely stop the motor
within
300
ms.
Reset the
motor
when it is in a operable
state by turningthe power switchON
again.
Consequently, once the motor islocked,do
not reset it until the power switch is again
turned
ON
even
if
the
troubles
have
been
solved.
(For N company's motor)
Whenthe defect of signalsfrom the built-in
sewing
speeddetector encoder is detected, light
lightup LD9,put the motor in an unenergized
state and then completely stop the motor within
300
ms.
Reset the motor whenit is in an operablestate
by turning the power switch ON again.
Consequently,once the LD9 islit up and the
motor is stopped, do not reset it until the power
switch is again turned ON even if the troubles
have
been
solved.
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53
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