@ OF JOHANNES HElDENHAlN GmbH
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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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