V 11/2014
Temperature Control Unit 90smart/150smart Operating Instructions 17
Alarm Messages
The RT70 control system can display various error messages (warnings
and alarms). Attention must be paid to these error messages without fail.
Otherwise, malfunctions of / damage to the temperature control unit and
production downtimes may result.
Pressing the Alarm Reset button allows you to acknowledge/reset an
alarm (e.g. switching off the horn). Only after the malfunction has been
rectified can the alarm display be cleared by once again pressing the
Alarm Reset button.
The Alarm Reset button also allows manual acknowledgement of the au-
tomatic switchover (toggling) from consumer temperature control (or cas-
cade control) Sn2 to outlet temperature control Sn1 in the event that
sensor Sn2 is defective or removed from the consumer.
Alarm list
Pressing the Alarm Reset button opens the alarm list, as long as there is
no active alarm. The last ten alarm messages are displayed in this list,
complete with date and time.
Warnings
Error message Rectification
Service is due
Carry out maintenance procedure according to the
operating manual. Increment the parameter Next
Maintenance by 1000 hours
Deviation set-point value/outlet underrun
Adjust the outlet temperature and acknowledge the
fault
Deviation set-point value/outlet exceeded
Adjust the outlet temperature and acknowledge the
fault
Leak stop not possible Reduce the temperature
Leak stop not allowed Unit is not allowed for leak stop
Suction not possible Switch the unit to normal operation mode
Alarms
Error message Rectification
Level 1 underrun Refill heat transfer medium
Toggling of heat transfer medium - unit must be re-
started
Switch the main switch off and on again
External set-point value signal interrupted or not pre-
sent
External set-point value signal must be present (if re-
quired, check external control system)
Analog option missing or defective
Connect analog option or switch off in the parameter
Hardware Options
Digital option missing or defective
Connect digital option or switch off in the parameter
Hardware Options
AD converter failure Replace base module
Attention - temperature control cabinet too high
Place the temperature control unit in a place with low
ambient temperature
Flow switch act
Check the outlet pressure (min. 0.7 bar must be pre-
sent)
Max. temperature exceeded
Max. temperature of the heat transfer medium may
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