BUSCH COBRA NS 0070-0600 C, Instruction Manual

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2.4 Standard Features
2.4.1 Water Cooling
The machine is cooled by a cooling liquid circuit in the cylinder cover and cylinder.
The cooling liquid pump (CLP) allows a recirculating flow in the cooling liquid chamber.
The cooling liquid is cooled by a plate heat exchanger (PHE) which must be connected to
the water main.
2.4.2 Sealing Systems
The machine is equipped with labyrinth seals on the motor side and suction side.
Sealing systems prevent the process gas going to the bearings chambers.
The sealing systems efficiency must be improved with a barrier gas system, see Barrier
Gas System [ ► 7] .
2.4.3 Barrier Gas System
The barrier gas system allows the supply of compressed air or nitrogen into the motor
side shaft seals in order to improve the sealing efficiency.
2.4.4 Resistance Thermometer
The resistance thermometer monitors the A-side oil temperature of the machine. A
second resistance thermometer might be installed to monitor the exhaust gas tempera-
ture.
Warning and trip signals must be set, see
Wiring Diagram Resistance Thermometer
[ ► 21]
.
2.5 Optional Accessories
NOTE
Depending on the ATEX classification of the machine, some of the following accessories
may be mandatory, see
ATEX Classifications and Associated Accessories [ ► 9] .
2.5.1 Nitrogen Panel
The nitrogen panel fitted to the base frame allows the supply of nitrogen to a number of
different points on the machine.
Each device consists of a solenoid valve to open or close the gas circuit, a pressure regu-
lator and a flow meter to adjust pressure and volume flow separately.
The following devices are available:
– The barrier gas system for sealing systems on motor side. This device is equipped
with a flow switch integrated to the flow meter to switch off the machine if the ni-
trogen volume flow drops below the minimum set flow value.
– The purge gas system fitted at the inlet flange allows to flush the machine after use
or during operation. The nitrogen is fed into the inlet flange.