Error Diagnosis - ASD INDUS onboard Manuel D'utilisation

INDUS onboard 71-752
Inductive signal transmission system

10. Error diagnosis

Only the green LED may illuminate if the supply voltage has been correctly connected. If one of the red LEDs
illuminate, there is an error in the system which can be pinpointed with the aid of the LED.
LED
LEDs are not The supply voltage is missing, too low
illuminated or has been connected incorrectly
A single red LED safety contact edge(s) not connected,
is illuminated connected incorrectly or faulty
One of the safety contact edge
connections is not being used
Both of the red The transmission line is faulty or has
Transmit LEDs been installed incorrectly
are illuminated
safety contact edge(s) not connected,
connected incorrectly or faulty
* If the error is not in the wiring, the function of the electronics can be tested by connecting an 8.2 kΩ
resistor to all safety contact edge inputs on the INDUS onboard 71-752 electronic evaluation system
(terminals 3, 6 and terminals 4, 6) and to the travelling coil core (connections O and C). If the electronics
work perfectly after performing the test, the safety contact edges must be checked using an ohmmeter.
To do this, the respective connection on the safety contact edge for the electronic evaluation system or
for the travelling coil core must be disconnected and connected to an ohmmeter.
The resistance must be 8.2 kΩ ±500 Ω when the safety contact edge is inactive and must not exceed 500 Ω
when it is active.
** If both of the LEDs for the travelling safety contact edges (Transmit Opening and Transmit Closing)
illuminate, there is an error in the inductive signal transmission system. The most frequent causes of
these errors are bad coil core connections, incorrectly installed cable system components (see INDUS
rail safety transmission system assembly instructions) or an impermissibly low supply voltage.
The maximum resistance value of the cable loop must not exceed 3 Ω . The resistance value can be
measured by disconnecting the steel cable from the ground terminal and then measuring the resistance
between the end of the steel cable and ground terminal.
Error
Check connections and supply voltage:
- +24 V DC at terminals 5 and GND at terminal 6
Tolerance range: ±10%
- Check the connections of the corresponding
- Check safety contact edge(s)*
Any safety contact edge connections that are
not being used must be permanently bridged
using one of the supplied 8.2 kΩ resistors
- Observe the mech. assembly instructions
- Check transmission coil cores for abrasion.
- Check cable loop; make certain that both
- Check cable / gate leaf contact points.
- Check supply voltage**
- Check the connections of the corresponding
- Check safety contact edge(s)*
Error correction
safety contact edge (squeezed or brittle supp-
ly lines, etc.)
(INDUS safety transmission system)
transmission coil cores are in the cable loop
safety contact edge (squeezed or brittle supp-
ly lines, etc.)
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