Rectifying the fault
Leuze electronic
MLD 300, MLD 500
77
11
Rectifying the fault
11.1 What to do in case of failure?
After switching the safety sensor on, the display elements see chapter 3.3 „Display elements“assist in
checking the correct functionality and in faultfinding.
In case of failure, you can determine the fault from the LED displays or read a message from the 7-
segment display. With the error message you can determine the cause of the fault and initiate measures
to rectifying it.
11.2 Operating displays of the LEDs
NOTICE
If the safety sensor responds with an error display, it may be defective.
Switch off the machine and leave it switched off.
Analyze and eliminate the cause of the fault using the following table.
If you are unable to rectify the fault, contact the Leuze electronic branch responsible for you or call the
Leuze electronic customer service (see chapter 13).
LED
State
Cause
Measure
LED at the transmitter,
per light axis
Off
Transmitter beam inac
-
tive or no supply voltage
Check the power supply
unit and the electrical con
-
nection. Exchange the
power supply unit, if appli
-
cable.
LED1 on the receiver
Red, slowly flashing
(approx. 1 Hz)
External fault
Check the connection of
the cables.
LED1 on the receiver
Red, flashing fast
(approx. 10 Hz)
Internal fault
If a restart is unsuccess
-
ful, contact customer ser
-
vice.
LED1 on the receiver
Green, slowly flashing
(approx. 1 Hz)
Weak signal due to soil
-
ing and misalignment
Clean the front screen
and check the alignment
of transmitter and receiver
see chapter 8.3 „Aligning
the safety sensor“.
LED2 on the receiver
Yellow
Start/restart interlock
locked
If there are no people in
the danger zone: operate
the restart button.
LED2 on the receiver
(with MLD 500/AS-i)
Off
No voltage at AS-i cable Connect the AS-i power
supply unit and test the
connection of the AS-i
safety sensor with the AS-
i cable.
LED2 on the receiver
(with MLD 500/AS-i)
Red
AS-i slave is not com
-
municating with AS-i
master
Check the connection of
the AS-i master with the
AS-i slave or correct the
AS-i address of the AS-i
slave or correctly reset
the AS-i profile in the AS-i
master.
LED2 on the receiver
(with MLD 500/AS-i)
Yellow, flashing
AS-i slave has invalid
address 0
Assign the AS-i slave a
valid address.
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