FDL (E2) 03/2011
page 48/68
11. Behavior in case of failures
11.1 Behavior after power failure
Power failure during fixed-value operation (Normal Display):
the entered parameters remain saved.
After power returns, operation continues with the set parameters. The heating starts operating after a
delay time of 4 minutes.
Power failure during program operation:
After power return program course continues with the set-
points that have been reached previously during program operation. The heating starts operating after a
delay time of 4 minutes.
11.2 Alarm messages
Alarm messages, e g. “RANGE ERROR CH1” in case of sensor rupture, are shown in Display 2 only in
Normal Display.
A buzzer can be activated / deactivated in the user level (chap. 10). It can be reset by pressing the EXIT
button. The alarm text shown in Normal Display goes off only if the cause of the alarm does not exist any
longer.
12. Safety devices
12.1 Temperature safety device class 2 (DIN 12880:2007)
The temperature safety device class 2 protects the unit, its environment and the charging material from
exceeding the maximum permissible temperature.
Please observe the guideline BGI/GUV-I 850-0 on safe working in laboratories (formerly BGR/GUV-R
120 or ZH 1/119 laboratory guidelines issued by the employers’ liability insurance association) (for Ger-
many).
In the event of a fault in the temperature controller, the safety device (2)
permanently
turns off the unit.
Only the fan continues running for safety reasons. This status is reported visually by the indicator lamp
(2a) and acoustically by the buzzer.
The operation of the safety device (2) is checked by moving it slowly counter-clockwise until it is turned
off. The safety device cut-off is reported visually by the indicator lamp (2a) and acoustically by the buzzer.
Then release the safety device by pressing the reset button (2b) and turn on the unit is as described pre-
viously.
Figure 9: Safety thermostat class 2
Function:
The safety thermostat class 2 is functionally and electrically independent of the temperature control de-
vice and turns off the unit at all poles.
When the control knob (2) is set to the end stop (position 10), the safety thermostat class 2 acts as a unit
protection device. If it is set somewhat higher than the set-point temperature selected on the controller, it
acts as a material protection device.
(2)
(2a)
(2b)
Summary of Contents for 9010-0269
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