Motor Mounting; Start-Up; Vacuum Pump; Adjustment Of The Thermostatic Valve (Option) And Adjustment Of The Temperature Class - BUSCH COBRA NC 0100 B Manuel D'installation Et De Maintenance

nameplate of the vacuum pump. The motor must imperatively be
certified for the gaz group IIC. Concerning the temperature class, a
higher protection degree can be applied. But only Busch original
couplings should be used.

Motor mounting

The motor is fixed to the center flange of the pump thank to 4 screws.

Start-up

CAUTION
The indications noted in this chapter replace the indications of the
standard installation and operating manuals!

Vacuum pump

Before setting up, you must familiarise yourself with the entire
installation and operating manual of the COBRA NC 0100 ¼ 0300 B.
Before operation, the pump must be filled with the relevant gear and
cooling oils (see also the installation manual).
In case of wrong rotation of the pump, extensive damage can occur.
Quickly press the Start/ Stop button to check the rotation sense (see
"Electrical connection").
At temperatures near or below freezing point, the pump must run with
the relevant antifreeze in the cooling system.
After the start-up, the vacuum pump has to be controlled everyday
regarding any noise appearance. In such a case, immediately stop the
pump, see "Troubleshooting".
Adjustment of the thermostatic valve
(option) and adjustment of the
temperature class
The temperature class of the vacuum pump is defined for an inside (i)
and outside (o) area, see explosion protection group on the vacuum
pump and also this installation manual. The inside area is in contact
with the drawn gaz and the outside area with the environment around
the pump.
WARNING
The keeping of the temperature class is controlled by the
temperature sensors TSA+/ 0102 and TSA+/ 0103. The adjustment
values of the temperature sensors are defined in the "COBRA ATEX
Catalogue".
The temperatures checked depend on several running values. In order
to ensure a trouble-free running, the adjustment of the thermostat
valve (option) should be done when the specialized Busch fitters
prepare the starting of the pump.
The following running values have a direct influence on the checked
temperatures:
l Temperature of the gas entry (< 60 °C)
l Cooling medium (water, mixture of water-glycol or thermal oil)
l Differential pressure between the entry and outlet of cooling
medium
l Cooling medium temperature
l Pressure on suction side and pressure side
l Frequency used
l Ambient temperature
The following table shows the following recommendations for the
adjustment of the thermostatic valve in case of different running
conditions.
Recommendation for the temperature adjustment of the COBRA
NC 0100 B
Running frequency 50/ 60 Hz, T
temperature < 60 °C Temperature class (o) outside T4
Tempera- Temperature
Cooling
ture class of cooling
medium
(i) inside medium [°C]
T4 Water < 30
Water-
T4 < 30
Glycol
Recommendation for the temperature adjustment of the COBRA
NC 0200 B
Running frequency 50/ 60 Hz, T
temperature < 60 °C Temperature class (i) inside T3
Tempera-
Temperature
ture class Cooling
of cooling
(o) medium
medium [°C]
ioutside
T3, T4 Water < 40
Water-
T3, T4 < 30
Glycol
Recommendation for the temperature adjustment of the COBRA
NC 0200 B
Running frequency 50 Hz, T
amb
rature < 60 °C Temperature class (i) inside T4
Tempera-
Temperature
ture class Cooling
of cooling
(o) medium
medium [°C]
outside
T4 Water < 40
Water-
T4 < 30
Glycol
-20 °C to +40 °C, Gas entry
amb
Pressure diff.
Position of
of cooling
thermostatic
medium p
Diff.
valve
[bar]
3 to 6 0...4
3 to 6 0...4
-20 °C to +40 °C, Gas entry
amb
Pressure diff.
Position of
of cooling
thermostatic
medium p
Diff.
valve
[bar]
3 to 6 0...4
3 to 6 0...4
-20 °C to +40 °C, Gas entry tempe-
Pressure diff.
Position of
of cooling
thermostatic
medium p
Diff. valve
[bar]
3 to 6 0...4
3 to 6 0...4
Start-up
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