4.2 Warnings and Error Mes-
sages
The UL 200 is equipped with comprehensive self-dia-
gnostic facilities.When a fault condition has been sensed
by the control board, this condition is indicated to the
operator via the LCD display (4/2) as far as possible.
Basically a difference is made between warnings and
error messages.
4.2.1 Warnings
Warnings are indicated
- when the measurement process has been interrupted
and when the UL 200 has been able to continue on its
own without user intervention (for example when catho-
de 1 is faulty the UL 200 automatically switches over to
cathode 2).
- when external influences impair the measurements (for
example an air inrush will cause the UL 200 to revert to
the Standby mode).
The UL 200 will indicate a massage on the display
(„W21: xxxxxxxxx“ ) and will remain in the Standby or the
measurement mode.
Warnings remain displayed until they are acknowledged
by pressing CLEAR or via a signal at the CONTROL
connection (see menu 14).Warnings are logged and can
be also be displayed at a later date through service
menu item 52.
4.2.2 Error Messages
Errors are events which force the UL 200 to interrupt its
measurement operations whereby the UL 200 is not able
to continue on it own. Errors are logged, and can be also
be displayed at a later date through service menu item
52.
The UL 200 remains in the error status described in the
following. After the fault cause has been removed the
error can be acknowledged by pressing the CLEAR
push-button (4/10) or via the CONTROL connection
(menu 14): The UL 200 then reverts to Standby.
Instrument status / instrument response in the case
of errors:
Hand unit Fig. 5:
All LEDs on the hand unit flash. As far as the error is
related to the hand unit the error code will also be dis-
played in the exponent display (5/9). START and
STOP push-buttons are disabled.
Control panel Fig. 4:
The trigger status displays (4/1), (4/3) and (4/4) are
off. The error information is indicated by the LCD dis-
play whereby an unambiguous error cause has been
assigned to each error condition (e.g. „E21: ...“).
In the case of several errors, the individual errors are
displayed cyclically for 2 s each.
Loudspeaker:
A frequency variable signal can be heard through the
loudspeaker. The frequency changes every 400 ms
from 500 to 1200 Hz so that this signal stands out
well from any ambient noises normally encountered,
and it can also be heard very well around the instru-
ment.
RECORDER connection (3/11):
A voltage of 0 V is output through channels 1 and 2 of
the analogue outputs. This voltage is not attained
during normal operation.
CONTROL connection (3/12)
Function Contact Contact
closed open
————————————————————
Trigger 1 5, 7 5, 6
Trigger 2 8, 10 8, 9
Trigger 3 / Fail 11, 13 11, 12
Ready/Fail 14, 16 14, 15
Note
During a fault valve 2a is open. All other valves (except
the exhaust valve) are closed. Detection system and test
flange are separated. The emission is switched off
depending on the nature of the fault.
System errors are errors with occur in the control elec-
tronics and indicate the presence of a fault in the control
assembly or in the operation of the instrument. Due to
the nature of the fault, the information which can be pro-
vided is limited and incomplete.
The errors are mostly detected during initialization of the
UL 200. Logging is not possible. The instrument can not
be operated. Errors which are marked by a number bet-
ween 10 ... 19 belong to this category of errors.
Note
Under extreme conditions (unknown software errors,
excessively high electromagnetic interference levels) the
built-in „watchdog“ circuit will prevent uncontrolled ope-
ration of the UL 200. This watchdog will cause the UL
200 to restart. After having done so, the instrument will
be running in the Standby mode. No error message will
be output.
Caution In case of enquiries please keep the
serial number and the software version
number of the instrument at hand (servi-
ce menu item 51).
37
TH 10.211/8.02 - 12/97
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