Stahl 8624-1, Руководство по эксплуатации

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Function/troubleshooting
14
167921 / 862460300010
S-BA-8624/1-01-en-30/07/2008
Control unit Ex p
8624/1
Fault during normal operation
Normal operation is automatically deactivated if:
X
Power supply fails for more than 2 seconds
X
The internal pressure of the enclosure falls below the set MIN value
(factory settings: 0.8 mbar)
X
The internal pressure of the enclosure exceeds the set MAX value
(factory settings: 15.0 mbar)
Fig. 8-4: Fault during normal operation
)
After having eliminated the fault, the control unit is activated automatically.
The control unit starts a new purging process if the pressure had fallen below
the MIN value.
T1: Purging is finished.
The preset internal pressure of the enclosure is adjusted (2 bar).
The devices in the Ex p enclosure are connected.
T2: Normal operation starts.
The internal pressure is adjusted to the nominal value (2 bar).
T3: The internal pressure starts falling.
The devices in the enclosure are switched off when reaching the MIN value.
T4: Repeated purging.
T5: Normal operation starts.
T6: The internal pressure starts increasing. The increased internal pressure cannot
escape via the mechanical valve of the control unit.
T7: The devices in the enclosure are switched off when reaching the MAX value.
T8: After pressure relief, normal operation starts again without repeated purging.
0,0
10,0
8,0
6,0
4,0
2,0
T1 T2 T3
12,0
20,0
18,0
16,0
14,0
T4 T5 T6 T8 T7