33
Error messages and troubleshooting table
Fault
Description
Causes
Effect
Solutions
Er 2
In remote operation (PC) mode
with activated watchdog func-
tion in mode 1: no commu-
nication between PC and RET
control
• PC does not transmit any data
within the set watchdog time
• Connection to PC interrupted
Heating switched off
Motor switched off
• Change watchdog time
• Transmit data from PC within set
watchdog time (OUT_WDx@m)
• Check cable and plug
Er 3
Device internal temperature
exceeds 80°C
• Heat accumulation between
heating plate and housing
• Permitted ambient temperature
exceeded
Heating switched off
• Switch device off, leave to cool
and switch on again
• Change experiment
• Observe maximum permissible
ambient temperature
Er 4
Difference between target and
actual speed exceeds 300 rpm
• Motor blocked or overloaded
Heating switched off
Motor switched off
• Reduce load torque or use smaller
magnetic rods
• Reduce target speed
Er 5
No temperature increase in
sensor at continuous tempera-
ture difference (after approx.
3 mins)
• Sensor not in medium
• Volume of medium to be mea
-
sured too large
• Heat conductivity of medium to
be measured too low
• Heat conductivity of the vessel is
too low
• In the case of indirect heating,
the overall heat conductivity
resistance is too large
Heating switched off
• Place the sensor in the medium
• Reduce the volume of the media
• Use a carrier fluid with better heat
conductivity properties
• Replace the glass vessel with a
metal pot
Er 6
Interruption in safety circuit
• Defective connection cable
Heating switched off
• Replace cable
Er 13
SAFE TEMP P adjustable safety
circuit defective
• Target/current different of the
adjustable safety circuit for mini-
mum temperature monitoring
Heating switched off
• After switching on, change the
SAFE TEMP to a different value; if
this solves the issue, the previous
value can be reset by switching
the device off and on again
Er 14
Short circuit in temperature
sensor 1
• Short circuit in temperature sen
-
sor plug
• Short circuit in the cable or tem
-
perature sensor
Heating switched off
• Check the plug
• Replace the temperature sensor
Er 21
Fault during heating plate sa-
fety test
• Safety relay does not open
Heating switched off
• Switch device off, leave to cool
and switch on again
Er 22
Fault during heating plate sa-
fety test
• S_CHECK cannot generate
H_S_TEMP
Heating switched off
• Switch device off, leave to cool
and switch on again
Er 24
The temperature of the heating
plate exceeds SAFE TEMP H
(Hotplate)
• SAFE TEMP H (Probe) has been
set to lower than the current
temperature of the heating plate
• Disconnection of heating plate
control temperature sensor
Heating switched off
• Leave the heating plate to cool
• Set the SAFE TEMP H (Hotplate)
higher
Er 25
Heating switching element
monitoring
• Heater control circuit switch
(TRIAC) short-circuited
• Safety relay has interrupted the
heating circuit
• Heater or the supply line is dis
-
connected
• Interruption in heating plate
safety temperature sensor
Heating switched off
• Switch device off, leave to cool
and switch on again
Er 26
Difference between internal
heating plate control and safe-
ty temperature sensor too large
• Irregular temperature distribu
-
tion across heating plate due to
sporadic heat dissipation
• Defective control or safety tem
-
perature sensor
Heating switched off
• Switch device off, leave to cool
and switch on again
• Ensure regular heat dissipation
when using metal blocks, etc.
on the flat surface of the heating
plate
Er 31
Defective monitoring of the
heating control circuit (TRIAC)
Heating switched off
• Contact customer service
Er 41
Bar breakaway
• The bar has broken away four
times in a row without an explicit
change in the target value
Target speed reduced
by at least 300 rpm
Heating switched off
• Select a lower target speed
• Select a smaller stirring bar
Содержание RET control-visc
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