LEYBOLD 157 89, Manual

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2.9 Status messages
The COMBIVAC CM 31 is able to display a variety of sta-
tus messages.
FAIL
FAIL indicates that there is a fault in the sensor.
If a fault is present when selecting a THER-
MOVAC measurement channel, one of the fol-
lowing error messages is displayed:
No sensor
Fault cause:
- Gauge head cable disconnected
- Damaged cable
- Sensor can not be identified
- Missing sensor
Filament broken
Fault cause
- Filament faulty
FAIL
The following applies to the PENNINGVAC
channel:
HV (high voltage) was switched on at a pres-
sure below 5·10
-9
mbar / Torr (5·10
-7
Pa).
Interrupted gauge head cable.
Sensor not connected.
Note
When switching on the high voltage the mes-
sage „FAIL“ will appear after 10 s until the gau-
ge tube has ignited and provided the pressure
exceeds 5·10
-9
mbar.
FAULT A fault has occurred during the execution of the
microprocessor program due to exceptionally
strong electromagnetic interferences or a brief
mains failure (1 to 3 seconds), for example. In
this case the instrument or the affected mea-
surement channel is reset to a stable through a
Watchdog function:
- Display:
Status FAULT, all other segments
may flash
- Chart recorder output is set high to 10.2 to
10.6 V.
- The contact of the Ready relay is opened,
trigger relays are set to the rest position.
Remedy:
Switch the instrument off (disconnect from the
mains). Reconnect after 5 s at the earliest.
This symbol indicates that the CM 31 should
be operated according to the Operating
Instructions as the instrument has been opera-
ted incorrectly.
For example.: L
The triggers are set to the interval mode, but
threshold 1 is higher or equal to threshold 2.
This symbol will also appear when operating a
key which - in that particular operating mode -
has no function. This symbol is automatically
erased after some time.
This symbol indicates the presence of a fault
within the instrument.
Initialization text when changing the sensor for
the TM channel.
The following applies to the PENNINGVAC channel:
Off
Cause:
- High voltage has not been switched on.
20
FAULT