MJK Automation Shuttle Ultrasonic Level Transmitter and Sensor - Manual (Page 33)

33 SW 838023 GB Shuttle Manual 100316
Fault finding
Power failure
If one of the relay outputs is
set to NC (normally closed),
an external alarm is im-
mediately sent out at power
failure.
Fault finding table
Problem Cause Remedies
The display
is not lit
Power supply Wire mounting Is min. 10 mm of the insulation removed and firmly
mounted?
AC supply Is correct live voltage present between terminals L and
N?
Is the right-hand fuse (40 mA@230 VAC, 100 mA@115
VAC) intact? Exchange if necessary.
DC supply Is 10 - 30 VAC present between terminals 10 and 12,
and is the polarity correct?
Is the left-hand fuse (200 mA) intact? Exchange if
necessary.
Shuttle ®
indicates
system error
Liquid
surface
Measuring Is the liquid surface foamy? Try changing the setting
method for measuring method from 'AP 1' to 'AP 2'.
(Shift + D)
Ultrasonic
sensor
Wire mounting Is a minimum of 10 mm of the insulation removed and
the wires firmly mounted?
Are the wires connected to the correct terminals? See
the connection diagram.
Cable Are there water in the connections, and are the
extensions extensions made correctly?
Condition Is the black part of the sensor miscoloured or
cracked? Miscolouring indicates that the sensor is not
suited for the environment on the installation site.
Function Is the sensor transmitting clicking sounds? If not, the
sensor is faulty.
Sensor Is the sensor mounted ABSOLUTELY VERTICAL?
mounting It is extremely important that the sensor is firmly
mounted in a vertical position. See the section
'Mechanical mounting of sensor'.
Measuring Is the sensor mounted so that the measuring distance
distance is less than the deadband and more that the max.
range? The max./min. measuring range must not be
exceeded.
EE-PROM error
Contack an MJK service
representative, if an EE-
PROM error appers.