Stahl 8624-1, Руководство по эксплуатации

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Function/troubleshooting
16
167921 / 862460300010
S-BA-8624/1-01-en-30/07/2008
Control unit Ex p
8624/1
Table 8-2: Fault during operation
Normal operation does not start
after successful purging The internal pressure is
displayed for approx. 4
seconds. Then the display is
switched off. MIN pressure not reached.
Internal pressure of the
enclosures is not sufficient after
purging. Pressure decreases. Seal the enclosure and the
installed equipment, readjust
the leakage nozzle if necessary
The internal pressure is
displayed during a short time
(longer than 4 seconds). Then
the display is switched off. MIN pressure not reached.
Internal pressure of the
enclosures is not sufficient after
purging. Pressure decreases. Seal the enclosure and the
installed equipment, readjust
the leakage nozzle if necessary
Pressure controller adjusted
incorrectly (e.g. 2 bar, static
pressure) Select 2.0 bar dynamic
pressure on the pressure
controller (i.e. with throughput of
compressed air / inert gas)
MAX pressure exceeded.
Internal pressure too high.
Pressure is increasing due to
e.g. heating Readjust the leakage nozzle
Control the limit value for
"Switchpoint max. pressure"
and enter the new value.
MAX pressure exceeded. Air
outlet (mechanical valve of the
control unit) is closed or clogged Open or clean the air outlet of
the control unit
The internal pressure is
displayed but there is no
authorization for non-explosion-
protected devices in the
enclosure Electrical wiring defective Control electrical connections
Device switches off
permanently during running
operation Device switches off
sporadically, then purging
restart Internal pressure reaching limit
value Readjust the leakage nozzle
The suction pressure of the
system fails temporarily, e.g.
when switching on a large
consumer Increase the suction pressure
on the pressure controller to
max. 3.5 bar
Automatic disconnection of the
non-explosion-protected
devices in the enclosure Power supply fails more than 2
seconds Automatic restart
MIN pressure not reached.
Enclosure not tight Seal the enclosure and the
installed equipment, readjust
the leakage nozzle if necessary
MIN pressure not reached.
Cross-section of the
compressed air / inert gas
supply is too small Replace the tubes by tubes with
larger cross-section
MAX pressure exceeded. Air
outlet (mechanical valve of the
control unit) is closed or clogged Open or clean the air outlet of
the control unit
The display of the internal
pressure is not deactivated 4
seconds after pressure loss
(e.g. by opening the enclosure
door) "Swichpoint min. pressure" set
incorrectly Set a new limit value
Key-operated bypass switch is
active Turn the key-operated switch to
the "Off" position
Fault Consequence Possible cause Elimination