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OF JOHANNES
HElDENHAlN
GmbH
-
D 8725Traunreut.Tel.(08669)31-0
Kundendienrt
Under certain
circumstances,
an inverse
video
display
can
-
again
be
generated
by means of the exclusive-or-gate-wiring
-31.4-.
A discretely
mounted timer
circuit
synchronizes
the
procedures
of the entire
CLP/Graphics
board.
- On the SE-board
(or the PLC interface
board)
the V-24
signals
of the handwheel
unit
are connected
to the line
drivers
or,
respectively,
to the line
receivers.
A serial
interface
module on the CLP/Graphics
board stands between
line
receivers/drivers
and the CLP processor
to transfer
data with
the handwheel
unit
and to format
data.
(start/
stop pulse
e.g.1
- The signals
of the 3D-probe
are buffered
via
the 3D-probe-
interface
on the SE board
(or PLC interface
board)
-53-
and is evaluated
via
the counter
module -32-
on the CLP
processor/graphics
board.
Power Supply Unit
- +5V are generated
for
the TTL modules via
the flow
converter
-7o-.
The flyback
regulator
-70.1-
inductively
coupled
with
the flow converter
generates
+/-15V for
the operation
ampli-
fier.
- The +12V supply voltage
for
the V.24 interface
is generated
with the help of the +15V by menas of a linear
regulator
-70.2-.
- +llV
are generated
via the flow
converter
-70.3-
for
the
TNC 151 (BE 111, BE 211) screen which in contrast
to the
TNC 155 (BE 411) screen does not have an own power supply
unit.
The switch
regulator
-70.01-
and -70.31-
readjust
the
output
voltage
load controlled.
- The soft
start
-71-
limits
the relatively
high switch-on
current.
SERVICE
Page 54
Section
MANUAL TNC
151/155
4.1
On the power supply board there
is, moreover,
a voltage
supervision
-62-
triggering
a reset
signal
if
the power
supply
is interrupted
or if the supply voltage
drops below
a predetermined
minimum level
(187V if
set for
220V opera-
tion)
for
a short
time.
If
U2 (+5V) exceeds if
there
is a failure
the
overvoltage
recognition
-63-
is immediately
effective
and causes the
overvoltage
protection
(thyristor)
-63.1-
to connect
through.
Thus Ul is short-circuited
coming directly
from
the power supply transformer
-64-
via the rectifier
-65-.
A greater
damage at the subsequent
electronics
is thus
inhibited
by means of this
protective
measure.
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