Lauda VF 20040 C, Руководство по эксплуатации

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Alarm and potential-free contact
When a malfunction occurs, an alarm is triggered. Each alarm is issued in the
form of an acoustic alarm signal and a visual alarm display.
All triggered alarms are stored in the controller.
When an acoustic alarm signal is issued, the potential-free alarm contact sim-
ultaneously connects to the in-house fault monitoring system.
The connection is located in the control cabinet behind the detachable lower
right side panel and marked with a sticker. The maximum contact load is
230 V/1.5 A.
Resetting an alarm
When a malfunction occurs, an alarm is triggered. Each alarm is issued acoustically in the form of an alarm signal and dis-
played visually in an alarm window. Pressing the acknowledgment symbol in the alarm window switches off the acoustic
alarm. The alarm screen closes and a red alarm symbol appears at the top of the touch screen unit.
The alarm symbol disappears automatically once the cause of the alarm has been rectified.
Probe monitoring
The temperature probe on the controller is monitored continuously for short circuits and disruptions. If a fault occurs, cor-
responding information appears on the display in plain text. At the same time, an acoustic warning signal sounds
(1 second on – 1 second off) and the potential-free alarm contact is switched over. If a probe is faulty,
the emergency program starts. The chest freezer cools for 30 minutes (compressors operate) and then pauses for
10 minutes. Then the process is repeated. Note: while the emergency program is running, the temperature may deviate
from the preset refrigeration compartment temperature.
Overtemperature or low temperature alarm
If the refrigeration compartment temperature exceeds the preset upper or lower temperature limit (as described in section
7.1), corresponding information appears in plain text on the display and an acoustic alarm sounds (1 second on – 1 sec-
ond off). The potential-free contact is switched over.
Mains power failure
In the event of a mains power failure, an acoustic warning signal sounds (1 second on – 1 second off) and the potential-
free alarm contact is switched over. The permanently integrated battery keeps the display and data logger (for data re-
cording) functioning for approx. 35 hours in the event of a power failure.
Battery fault alarm (internal battery)
If the internal battery develops a fault, corresponding information is shown in plain text on the display, alternating with the
current temperature. An acoustic alarm sounds (1 second on – 1 second off). The potential-free contact is switched over.
Statutory provisions must always be observed when disposing of a faulty battery.