18
Temperature controller 70304 | 1.02.00
www.mc-techgroup.com
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
1
2
3
Heating up
off
on on/off
Normal
Heating on
on
on
on
Heating off
on
on
off
Alarm
X
off
X
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
keys simultaneously or
•
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
EXIT
and
keys simultaneously or
•
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.
