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-11 -
a.
Pen
descending
pulse must be
300
pps
-10%,
+0%
(3.33s, -
0%,
+10%).
b. The X or
Y axis
motor
must
be started
to
run in more
than 3.33ms after a pen down pulse. Also, the
X
or Y
axis
motor
must
be started
to
run
in more
than 3.33ms
after a pen up
pulse.
c. The
Z
motor
hold
time
during
pen
down
must be
more
than
8.22ms.
when the hold time
is
to be observed
on
the oscillo-
scope,
it must be measured in terms of "c
+ a'" with
reduction
of
"a".
d. The X
motor
pulse
must
be 365 pps
+O, -10%
(2.74ms
+10%,
-0).
e.
When both the X and Y motors are to
be
operated at the
same
time,
the same clock must be used for both motors
with a current on time difference being less than 0.1
ms.
f.
The Y motor pulse must be 365 pps
+O, -10%
(2.74ms
+1-%,
-0).
g.
The X motor hold time
must
be more than 8.22ms.
h.
Pen up and down currents
must be started to apply in
2.74ms after the currents have been applied to the X and
Y
motors.
i.
The pen up pulse must be 300 pps +O, -10% (3.33ms
+1-%, -0%).
j. The Y
motor
hold time must be more than 8.22ms.
k. The Z motor hold time during pen ascending must be
more
than 8.22ms.
Y-axis
position
X-axis
position
Down
Pen position
Kept
stable as it is
pulled
by
Up
the
magnet,
not by
a pulse
Phase
0
Phase C
Phase 8
Y-axis
motor
----------
Basic pulse
Phase A
-------'
CD
Phase
B
-----------+-------------
X-axis
motor
Phase C
-----'
Basic
pulse
Phase A
-----'
Phase D
Phase
B
z-axismotor
--~
Phase C
Phase A
©
@
Basic
pulse
Ipnnt exemcte
l
A pen descends,
and ascends
after drawing the
figure
as
illustrated.
j
(6) Z-axis stepping motor drive signal
-
PC-2500
a.
To shut off the respective current when the X-axis or
Y-axis stepping motor is at halt serves to reduce power
consumption.
However,
if the current is shut off with a
normal pulse width b, it may cause a disturbance be-
cause mechanical vibration still continues. In order to
prevent it, there is a need of applying the current for a
period
of
the hold time (tMH) which shall be three times
the
motor
clock.
Since "tc" is
2.74,
"tMH" shall be
more than
8.22ms.
The upper limit of "tMH" must be
20ms
to prevent
performance
deterioration
due to
motor
heat.
b.
In case there
is
a need of running the motor within the
hold
time,
it is permitted to rotate to a next step within
a period of band
a.
c.
Motor
clock "tc" shall be 2.74ms +10%, -0.
Current is continued
to apply in order to
maintain a
proper
tempo.
Halt
ti
m
e:
9.2ms
(20ms, max.)
Motor
l
o ck state 2.74ms
tC
Hold
i
s used
to
apply in
order
.,.___t=M~H~
_
__,,.to stop
rotation.
Motor clock
Phase D
--+---'
l
,_
._!
_
@
rotation
Phase B
Counterclockwise
___.
'
I
1_ -
-
-
-
-
-
-
-
-
'-----
Phase
A
__J
Depending on what
location
the
lock
should
be
applied, the
method of
pulse
impression
varies.
Basic dri
v
e
pulse
_...L._....L _
_j_ _
_._ _
_._ __
~---------
(5)
X-axis,
Y-axis
stepping motor drive
signals
Because of a larger
contact
resistance, attention must be
paid to input impedance
and
threshold level.
Elastic contact switch
Type
(Type:
KEG
10012)
Maximum rated voltage
DC 12V
Maximum rated
current
20mA
Moving
distance
0.8
mm
Contact resistance
MAX 1K.!1
Bounce
MAX
10
msec
Life
1x10
5
cycles(DC12V 5mA)
(4) Carriage position
detector
Item
X-axis
Y-axis
Z-axis
Condition
Voltage
5.3
±
0.5V
5.3±0.5V
0
-
50°C
Type
4-phase stepping
motor
(2-phase
excitation)
DC
25.!1± 10%
50.!1± 10%
20°C
resistance
30.!1±10%
(per
phase)
Peak
0.17 A
0.21
A
0.12
A
20°C 5.3V
current
Average
0.24 A
0.29 A
0.26
A
0°C
5.8V
current
0.16 A
0.09 A
20°C 5.3V
per
phase
0.14 A
(3) Stepping
motor
electrical characteristics
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