Trip procedure
When a dysfunction occurs on the screw vacuum pump, it should im-
mediately be stopped. Close without delay the suction valve MV1, in
order to avoid the ventilation of the recipient via the screw vacuum
pump and the pump has to be immediately inertised.
Shutdown procedure
l
A problem has been indicated by a monitoring element during the
running of the pump
l
Close immediately the suction valve MV1 and simultaneously
supply non explosive gas into the flushing gas connection, suction
side
l
Switch off the vacuum pump (motor)
l
Non explosive gas volume flow :
u
NC 0100 B :
³
25 liter/ min
u
NC 0200 B :
³
40 liter/ min
u
NC 0300 B :
³
75 liter/ min
l
Inertise during at least 200 seconds, then close the gas supply and
the inerting is finished
l
Switch off the pump, close the valves MV2, MV3, MV5, MV7
Before to restart the vacuum pump, the cause of the problem has to be
found and solved. This is particularly important when
TSA+/ 0102,
TSA+/ 0103, PSA+/ 0301 or SA+/ 0701
have indicated the problem.
The vacuum pump should be installed such a way than when the
pump stops, a rear current resp. a reflux of the drawn medium is not
possible.
Protection against explosions
The vacuum pumps COBRA NC 0100 ... 0300 B are conformable to
the European directive 2014/ 34/ EU.
The vacuum pumps are provided with one of the following characteris-
tics for the protection against the explosions:
COBRA NC 0100 B
or
1
Apparatus according to directive 2014/ 34/ EU
2
Equipment group II (
Not for mining application
)
3
Inside and outside of the vacuum pump
4
Possible explosive gas atmosphere in normal running inside
and
outside
(apparatus category 2, for Zone 1) or only in case
of dysfunction
(apparatus category 3, for Zone 2)
5
Type of protection
6
Maximum gas and surface temperature (temperature class T4
= 135 °C, T3 = 200 °C)
7
Special conditions for safety utilization
For the adjustment of the temperature class, imperatively refer to
“Adjustment of the thermostatic valve (option) and adjustment of the
temperature class”.
In the table below, you will find the possible alternative of temperature
classes depending of the cooling system and the maximal motor
frequency:
Cooling
system
Direct cooling
Recirculating cooling
Type
Temperature
class
Max. motor
frequency
Temperature
class
Max. motor
frequency
NC 0100 B
T4(i/o)
60 Hz
T4(i/o)
50 Hz
COBRA NC 0200 B
or
The following temperature classes are available
–
T4(i/o)
or
–
T3(i)/ T4(o)
or
–
T3(i/o)
when the vacuum pump is equipped with a direct cooling system. If
the vacuum pump is equipped with a recirculating cooling system, the
following temperature classes are available
–
T3(i)/ T4(o)
or
–
T3(i/o)
For the adjustment of the temperature class, imperatively refer to
“Adjustment of the thermostatic valve (option) and adjustment of the
temperature class”.
Description
Seite/ Page/ Page 15
Flushing gas
connection
II
I
nside
2G
or
3G
IIB
T4
O
utside
2G
or
3G
IIB or
IIC
T4
Ex
h
Ex
h
Gb
or
Gc
Gb
or
Gc
X
X
II
II
Inside
Outside
2G
or 3G
No
ATEX
Zone
IIB
T4
X
1
2
3
4
5
6
7
9
Gb
8
Ex
h
II
2G
or
3G
IIB
T3, T4*
No ATEX Zone
2G
or
3G
IIB
2G
or
3G
IIC
or
IIB
II
I
nside
O
utside
II
I
nside
Ex
h
Ex
h
Ex
h
T3,
T4*
T3, T4*
Gb
or
Gc
Gb
or
Gc
X
X
Gb
or
Gc
X
O
utside
II
II
Explosion group
8
9
E
quipment protection level
Содержание COBRA NC 0100 300 B Series
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