Product Description | 2
Instruction Manual COBRA NC 0100-0300 B ACV_EN_en
7 | 48
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 can be equipped with a variable speed drive (option).
2.4
Standard Features
2.4.1
Air 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 an air-water heat exchanger (AHE).
A fan, fitted on the motor shaft, allows the cooling air to be drawn and then pushed through the
heat exchanger.
2.4.2
Temperature Switch
The temperature switch monitors the cooling liquid temperature of the machine.
The machine must be stopped when the temperature switch trips (85 °C for NC 0100 B,
106 °C for NC 0200 B, 125 °C for NC 0300 B).
2.4.3
Sealing Systems
The machine is equipped with labyrinth seals on the suction side and with PTFE shaft seals on the
motor side.
Other sealing systems are optionally available, see Mechanical Seals [
7].
Sealing systems prevent the process gas going to the bearings chambers.
Depending on the application, the sealing systems efficiency can be improved with a barrier gas sys-
tem, see Barrier Gas System [
7].
2.5
Optional Accessories
2.5.1
Gas Ballast Valve
The gas ballast valve mixes the process gas with a limited quantity of ambient air to counteract the
condensation of vapor inside the machine.
The gas ballast valve has an influence on the ultimate pressure of the machine, see Technical Data.
2.5.2
Silencer
A silencer at the discharge connection (OUT) can be provided to reduce the exhaust gas noise.
A non-return flap can be optionally added to the silencer.
2.5.3
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.
2.5.4
Mechanical Seals
The sealing systems can be equipped with mechanical seals. The following variants are possible:
●
Oil lubricated single mechanical seals on the motor side and labyrinth seals on the suction side.
●
Oil lubricated single mechanical seals on the motor side and suction side.
●
Gas lubricated double mechanical seals on the motor side and oil lubricated single mechanical
seals on suction side.
