Service manual

SERVICE MANUAL TNC 415B/425

Page 121

Issue: 20.08.95

When the override potentiometer is turned to the right, the control outputs an analogue voltage which is

increased proportionally to the servo lag up to a maximum value of 10V. The control operates correctly,

if a voltage of 10V ± 0.1V can be measured at the test adapter with the multimeter. If no voltage can be

measured, switch off the main switch, unplug the connector X8 from the logic unit, disconnect the nominal

value line from the servo amplifier and test this line for short-circuit. If the nominal value line is in order,

connect X8 to the logic unit again (leave the nominal value line disconnected), switch on the main switch and

repeat the measurement with reference mark traverse. If an analogue voltage can be measured now, the

control operates correctly. If no voltage can be measured, the analogue output of the logic unit is probably

defective.

Measuring Setup to Check the Analogue Outputs

servo

amplifier

ANALOGUE

logic unit

test adapter

multimeter

5.15V

X8 Nominal value output for 1, 2, 3, 4, 5, S

flange socket with female insert (15-pin

Pin No. Signal Pin No. Signal

1 analogue output 1 11 0V analogue output 2

3 analogue output 2 13 0V analogue output 3

5 analogue output 3 14 0V analogue output 4

7 analogue output 4 6 0V analogue output 5

4 analogue output 5 15 0V analogue output S axis

8 analogue output S axis housing external shield = housing

9 0V analogue output 1 2, 10, 12

do not assign

Observe the safety instructions!