6141.22X Incubator 8000 IC/SC/NC
Function Description
09.99 Page 26 of 49
2.2.2.29 Power on (11)
The power switch controls the supply voltage for the mains power relay K1 and K5. The supply
voltage is generated by a small auxiliary transformer.
2.2.2.30 Fan
for
additional cooling
(44
)
In order to shorten the time required for cooling down the Incubator an additional fan placed in
the electronics is activated by air heater feedback signal. These pulses are used for re-
triggering a mono stable flip-flop. The fan is on whenever the air heater is shut off.
2.3 Description of safety facilities
2.3.1 Alarm display
The incubator features a graded alarm behavior. Faults occurring are indicated as a function
of their significance. The alarms for set value deviations, over-temperature and water shortage
feature an intermittent alarm tone which can be deactivated for 10 minutes. All other faults are
signalled by a continuous tone which cannot be silenced. In addition the corresponding alarm
LED flash. Each individual alarm likewise leads to an indication on the central alarm LED (not
available on Incubator 8000 SC / NC with software version 10.n).
2.3.1.1 Alarms in the event of set value deviations, over-temperature and
water shortage
- Actual value display or desired value display humidity Inc. 8000 SC / NC of module
concerned flashes.
- The corresponding alarm LED flashes.
- Intermittent alarm tone (can be deactivated for 10 min).
The alarm tone for the set value/actual value difference > -1.5 °C air temperature is
suppressed automatically for 30 minutes following switch-on of the Incubator. If during this
period the actual value is at least 1.5 °C below the set value, the alarm and the current
suppression time are indicated by the corresponding LED. In this case the actual value display
does not flash. The alarm suppression time is reset prematurely as soon as the actual air
temperature value is no longer 1.5 °C below the set value.
The over-temperature alarm is stored by means of a bipolar relay and must be reset with the
reset button after termination of the over-temperature status. All other alarms are reset
automatically once the cause of the fault has been eliminated.
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