BUSCH COBRA - Start Controls and Standard Features; Optional Accessories

Product Description | 2
Instruction Manual COBRA NC 2500 B WCV_EN_en 7 | 52
2.3 Start Controls
The machine comes without start controls. The control of the machine is to be provided in the
course of installation.
The machine must be equipped with a variable speed drive (not included in the scope of supply).
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 motor of the cooling liquid pump must be electrically connected, see Electrical Connection of the
Cooling Liquid Pump [➔22]
The cooling liquid is cooled by a plate heat exchanger (PHE) which must be connected to the water
main.
2.4.2 Cooling Gas Unit
The purpose of the cooling gas unit (CGU), including an air filter is to cool the compression chamber
and reduce the amount of heat generated by the compression of the process gases.
By inlet pressure < 300 mbar, cooling air is automatically drawn in through an air filter.
2.4.3 Resistance Thermometer (Cooling Liquid)
The resistance thermometer monitors the cooling liquid temperature of the machine.
Warning and trip signals must be set, see Wiring Diagram Resistance Thermometer [➔24].
2.4.4 Resistance Thermometer (Exhaust Gas)
The resistance thermometer monitors the exhaust gas temperature at the machine discharge.
Warning and trip signals must be set, see Wiring Diagram Resistance Thermometer [➔24].
2.4.5 Sealing Systems
The machine is equipped with labyrinth seals on the motor side and suction side.
Other sealing systems are optionally available, see Mechanical Seals [➔8].
Sealing systems prevent the process gas going to the bearings chambers.
The sealing systems include a barrier gas system, see Barrier Gas System Connection [➔15].
2.5 Optional Accessories
2.5.1 Silencer
A silencer at the discharge connection (OUT) can be provided to reduce the exhaust gas noise.
2.5.2 Vibration Diagnostic Unit
The vibration diagnostic unit monitors the correct mechanical operation of the machine.
This unit is composed of a vibration sensor (SA) and a diagnostic electronics VSE100 (delivered
loose).
The machine must be stopped when the vibration limit value (preset at the factory) is reached, see
Wiring Diagram Vibration Diagnostic Unit [➔24].