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16
LOW TEMPERATURE ALARM AND EXCESS TEMPERATURE LIMITATION
The controllers type 70304 and 70304.2 are adjusted and wired so that it uses relay 2 as an low temperature
alarm output and relay 1 as an excess temperature limitation with permanent deactivation.
Both alarms are indicated on the controller front panel by the respective number (1 or 2) extinguishing. This
takes place if the setpoint temperature is higher or lower than 10 °C.
Operating state
Heating up
Heating on
Normal
Heating off
Alarm
16.1
RESTARTING AFTER EXCESS OR LOW TEMPERATURE ALARM
In order to restart the unit after a temperature alarm with permanent deactivation, the cause of the alarm must
initially be remedied.
With not programmed ramp functions, an alarm reset must take place as follows:
•
Press
EXIT
and
•
Switch off and on the mains voltage.
With programmed ramp functions, an alarm reset must take place as follows:
•
If the actual value is < ±10 °C to the setpoint press
•
Switch off and on the mains voltage.
In case of an alarm reset by switching off and on the mains voltage the ramp start value is equivalent to the actual
value.
17
70304 OR 70304.2 WITH mA-OUTPUT
The controllers 70304 and 70304.2 are also available with a mA-output. This output is also configurable. The output
signal and the temperature range are adjustable.
18
1
2
off
on
on
on
on
on
X
off
keys simultaneously or
Temperature controller 70304 | 1.02.00
3
on/off
on
off
X
EXIT
and
keys simultaneously or
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