19
English
11. 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
Error
Error correction
LEDs are not
illuminated
The supply voltage is missing, too low or
has been connected incorrectly
Check connections and supply voltage:
‑
24 V AC/DC at terminals
8 9
Tolerance range: ±10%
A single red LED
is illuminated
Contact edge(s) not connected, con‑
nected incorrectly or faulty
‑
Check the connections of the corresponding contact
edge (squeezed or brittle supply lines, etc.)
‑
Check safety contact edge(s)*
One of the contact edge connections is
not being used
Any contact edge connections that are not being
used must be permanently bridged using one of the
supplied 8.2 kΩ resistors
Both of the red
Transmit
LEDs
are illuminated
The transmission line is faulty or has
been installed incorrectly
‑
Observe the mech. assembly instructions
(ISK safety transmission system)
‑
Check transmission coil cores for abrasion.
‑
Check cable loop; make certain that both trans‑
mission coil cores are in the cable loop
‑
Check cable / gate leaf contact points.
‑
Check supply voltage**
Contact edge(s) not connected, con‑
nected incorrectly or faulty
‑
Check the connections of the corresponding contact
edge (squeezed or brittle supply lines, etc.)
‑
Check safety contact edge(s)*
* If the error is not in the wiring, the function of the electronics can be tested by connecting an
8.2 k
W
resistor to all SCE inputs on the ISK 71‑24 electronic evaluation system (terminals
3
,
10
and terminals
3
,
11
) 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 SCE 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 k
W ±
500
W
when the safety contact edge is inactive and must not
exceed 500
W
when it is active.
** If both of the LEDs for the travelling SCEs (
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 IKS
safety transmission system assembly instructions) or an impermissibly low supply voltage.
The maximum resistance value of the cable loop must not exceed 3
W
. 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.
