BUSCH COBRA DS 8163 A Installation And Operating Instructions Manual Download Page 10

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the settings, nomally at 30s). If there are several WY Roots, they
start together.

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3) Cold start timer: After the start-up, the WY Roots runs at low
speed for heating-up. It runs normally when the delay of the timer
“COLD START” is done (timer settable in the settings, normally at
1200s).
The timer can be bypassed by pressing the “Start” button 5
seconds.

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4) Ready for work: When the COBRA NS pump and the WY Roots
pump are hot, the pump can normally work for the customer
process.

–

5) Purge time: When the “Stop” button is pressed only one time,
the “PURGE TIMER” starts. When the timer is done (timer settable
in the settings, normally at 1800s), the pump switches off
normally. This timer can be desactivated by the parameter “PURGE
CYCLE = OFF” in the settings. The timer can be bypassed by
pressing the “Stop” button 10 seconds.

–

6) Stop sequence: All the WY Roots pumps are firstly stopped and
then all the COBRA NS vacuum pumps stop 60 seconds after. The
timer can not be modified.

Structure

The vacuum sytem COBRA DS is made of the following elements:

–

a) One or more COBRA DP 600 C (DP1, DP2, DP3...) backing
vacuum pumps with sensors

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b) Horizontal silencer mounted on each vacuum pump (standard)

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c) Vertical silencer installed behind each vacuum pump
to collect condensates in an external tank. This silencer is water
cooled (29 l/min) (option)

–

d) Connection kit MB to DP. The kit contains different parts (solid
pipes with belows and o-rings hold by claws and screws). Each kit
depends on the pump configuration. If there are only one DP 600
and one WY Roots (DS 8161 for example), the connexion is
directly made from the MB Roots to the DP 600.

–

e) One or more WY A075 boosters (MB1, MB2...) rotary lobes
vacuum pumps with sensors and frequency inverter.

–

f) An electrical box mounted on the right or rear side of the MB
booster with combined cables (powers and sensors) for each
pump.

–

g) An LCD controller.

–

h) Nitrogen and water distributor if several pumps (DP and/ or
MB) or options (vertical silencer) are used.

–

i) Other special parts if the vacuum system is specially large extra
(extra inlet or exhaust piping, special power cables rack).

All parts of the installation are mounted on a stable frame and are
completely equipped with their pipes.

The electrical components are wired with an connection box.

Combi DS 8163 A: one Roots WY A075 and one COBRA DP 600 C
pump (Separate electrical box and vertical silencer (option)):

Oil circulation

Since the complete operating principle works without contact, no oil
circuit is needed in the work area.

Cooling

WARNING

The cooling liquid system is active only when the DP vacuum pumps
are in function. The cooling liquid circuit works on the axe of the
motor.

WARNING

The cooling water system is always active. The cooling water flows
continously from the water distributor.

The vacuum system COBRA NS is cooled by

–

the circuit of cooling liquid (mix of water and glycol) inside the
water chambers (6) of cylinder and endplate of cylinder B-side An
indirect circuit is made with a water pump mounted at the motor
endplate. The flow of the cooling water is controlled by a flow
switch FS 1. If the flow is under 1 l/min during a minimum time of
30 seconds, then the pump stops.
The temperature switch TS 2 will give an emergency signal if the
temperature of the cooling liquid is above 100°C.

–

a cooling water circuit (4) in the cylinder and endplate of cylinder
B-side. The cooling water flow is controlled by the thermostatic
valve TR whose temperature sensor is assembled in the cylinder
cover side A. The position of the thermostatic valve is leaded of
factory with 3,5 (higher value will set hotter temperature into the
cylinder). Normally setted at position 2,5.

–

a direct cooling water circuit in the motors of COBRA NS vacuum
pump. The cooling water flow is preset at 29 l/min at the factory
and can be adjusted with valve CWV 1. The flow is controlled by
flow switch FS 2. The cooling water circuit stabilizes the
temperature of cooling liquid. When flow is too low a warning
then an alarm signal is generated by flow switch FS 2 to the PLC.
Status of the pump depends on the alarm function set by user
(factory setting: EMO, pump stops after alarm condition).

–

a direct cooling water circuit in the motors of WY rotary lobes
vacuum pump. The cooling water flow is preset at 29 l/min at the
factory and can be adjusted with valve CWV 2. The flow is
controlled by flow switch FS 3. The cooling water circuit stabilizes
the temperature of coolong liquid. When flow is too low a warning
then an alarm signal is generated by flow switch FS 3 to the PLC.
Status of the pump depends on the alarm function set by user
(factory setting: EMO, pump stops after alarm condition).

NOTE

–

The COBRA DS vacuum systems are generally dispatched with oil
and cooling liquid already in the vacuum system but, without
cooling water. Before vacuum system first startup, control the oil
level and the cooling liquid level. In the event of absence of one or
the other of these lubricants, please carry out the filling (please
refer to the various chapters of filling). Do not forget to connect
the cooling water supply before the first startup. Operation
without these coolants can result in damage to the vacuum system.

–

The CWM 1 and CWM 2 captors are serial connected. One alarm
signal is generated for the both.

Nitrogen system

WARNING

The nitrogen system is active only when the DP vacuum pumps are
in function. The electrovalve is controlled by KDP.

The nitrogen system performs two main functions:

–

nitrogen is used as dilution gas. It is injected in the middle hole (9)
and is preset at 20 l/ min. It can be adjusted with valve DGR 1,
depending on the application. But higher the dilution flow is,
worse the base pressure will be. Nitrogen flow injected in the hole
on cylinder endplate side (8) is preset at 40 l/ min and can be
adjusted with valve DGR 2, depending on the application. When
flow is too low a warning then an alarm signal is generated by flow

Product description

COBRA DS 8163 A

Page 10

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