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DR. JOHANNES
HEIDENlUlN
GmbH
D-6225 Traunreut
.Tel.(O8669)31-0
SERVICE
MANUAL TNC 151/155
Page
35
Kundendienst
Se&ion
2.2.6
fiypJ:
Analog
output
voltage
The performance
of the
analog
output
circuitry
can be
checked
by connecting
a DVM to each
of the
analog
outputs
(eg X-axis:
Jl,
pinl,
w.s.t.
pin
2) and selecting
this
test.
Using
the
keys
voltage
increments
of
2,44mV,
24,4mV,
244mV and 2,44V
respec-
tively
can be summed at at
each of
the
analog
outputs
(X, Y,
z,
IV,
S).
eg.:
if
th
X
key
is
pushed
5 times,
the
IV key
once,
the
output
voltage
should
read:
c?
themkey
3 times,
and
(5 x
.44mV)
+ (3 x 24.4mV)
+ ( 1 x 2.44V)
= 2.525V
The polarity
of the
output
can be reversed
using
the
key
The output
can be cleared
using
the
key
El
The hold
time
of the
sample
and hold
amplifier
can by
selected
to either
5ms or
5OGms using
them
key.
Key
q
: + 1ov analog
output
The
analog
outputs
should
generate
their
maximum
output
of + 1OV. The polarity
can be reversed
as in
test
2.
Key
q
: Battery
voltage
check
A "1"
will
be displayed
on the
VDU if
the
battery
voltage
is
adequate,
otherwise
a "0"
is
displayed.
Key
q
: Transducer
pulse
count
comparison
The counting
function
of each
axis
can be checked
by connecting
a rotary
encoder
to the
respective
transducer
input.
Key m,:
Start
count
after
reference
mark
is
detected
Key
q
: Stop
count
after
reference
mark
is
detected
If
no encoder
is
connected
"WVWVVWV"
is
displayed
in the
respective
axis
(excluding
handwheel).
eg.
testing
using
- 100 line
rotary
encoder
- 20-fold
TNC interpolation
pulse
count
= no.
of
lines
x interpolation
= 100 x 20
= 2000
From
this
example
the
display
has
to be diviseable
by 2000.
Display:
32000
: 2000 = 16
in
order
Display:
32250
: 2000 = 16,125
defective
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