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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