l
Put up label or warning board “Maintenance in progress” on or
next to the pump.
Start-up after maintenance
l
Remove label or warning board “Maintenance in progress”
l
Check the oil level according to the chapters “Checking the oil le-
vel”
l
Connect the pump up to the power supply
l
Make sure that the “Necessary installation instructions” are follo-
wed
l
Open the cooling liquid supply, adjust the flow rate to 12 l/min
l
Start the vacuum pump
l
Open the injection of cooling liquid in the cylinder, adjust the flow
rate of the injection of cooling liquid (INJ)
u
With the pump operating at 60 Hz/3600 rpm and an inlet
pressure < 100 mbar. Adjust the cooling liquid flow rate to
6 l/min or a quantity sufficient to ensure an exhaust gas outlet
temperature <80°C
u
Check the exhaust gas outlet temperature <80°C
l
If the vacuum pump is equipped with a solenoid valve at the inlet:
u
Open the solenoid valve
l
If the vacuum pump is equipped with a shut-off valve at the inlet:
u
Open the shut-off valve
Checking the oil
Checking the oil level
l
Make sure that the vacuum pump is switched off and cannot acci-
dentally be switched on again
l
Check the oil level on the different oil sight glasses
If the oil level is below the required level:
u
Top up with oil (see “Topping up Oil”)
If the oil level is above the required level:
u
Check the evacuation of the condensates.
u
Change the oil (see “Change the oil”)
Topping up with oil
NOTE
: Under normal conditions there should be no need to top up
with oil in-between the recommended oil change intervals. A
significant drop in the oil level indicates a malfunction (see
“Troubleshooting”).
NOTE
: The procedure of filling up with oil is identical for both sides. It
will be described in this operating instructions only for a single side.
Please repeat the following operations for the second side.
CAUTION
Fill in oil only through the oil filler holes.
CAUTION
Risk of injury (burns) with open oil filler orifice.
Risk of injury in case of badly screwed-in plugs.
Remove the oil filler plugs only when the vacuum pump is stopped.
The vacuum pump must only be operated when the oil filler plugs
are firmly tightened up and do not leak.
l
Make sure that the vacuum pump is switched off and cannot acci-
dentally be switched on again
l
Remove the oil filler plugs (OFP)
l
Top up with oil
l
Make sure that the oil level is on MAX-mark of the oil sight glass
l
Make sure that the seal of the oil filler plug are not damaged and
replace plug if necessary
l
Refit the oil filler plug and tighten up
Checking the colour of the oil
NOTE
: The original colour of the oil used on the COBRA vacuum
pumps is dark. Under operation, no indication can be provided by
means of the colour.
Life-span of the Oil
The oil life depends very much on the ambient and operating
conditions. Under normal conditions the oil must be changed every
5000 operating hours.
Under very unfavourable operating conditions the oil life can be less
than 500 operating hours. A very short oil life time indicates either a
malfunction (see “Troubleshooting”) or unsuitable operating
conditions.
If there is no experience available regarding the oil life under the
prevailing operation conditions, it is recommended to have the oil
analysed every 500 operating hours and thus to establish the oil
change interval accordingly.
Oil change
NOTE
: The procedure of oil change is identical for both sides. It will be
described in this operating instructions only for a single side. Please
repeat the following operations for the second side.
WARNING
In case the vacuum pump has conveyed gases that have been
contaminated with harmful foreign materials, the oil will also be
contaminated.
Danger to health during the change of contaminated oil.
Danger to the environment.
Wear protective equipment during the change of contaminated oil.
Contaminated oil is hazardous waste and must be disposed of se-
parately in compliance with applicable regulations.
Draining used oil
NOTE
: After switching off the vacuum pump at normal operating
temperature wait no more than 20 minutes before the oil is drained.
l
Make sure that the vacuum pump is switched off and cannot acci-
dentally be switched on again
l
Make sure that the vacuum pump is vented to atmospheric pres-
sure
l
Put a drain tray underneath the oil drain ball valve (ODV)
l
Open the oil drain ball valve (ODV)
l
Drain the oil
When the oil flow has stopped:
u
Close the oil drain ball valve (ODV)
l
Switch on the vacuum pump for a few seconds
l
Make sure that the vacuum pump is switched off and cannot acci-
dentally be switched on again
l
Open the oil drain ball valve again and drain any remaining oil
l
Close the oil drain ball valve (ODV) again
l
Dispose of the used oil in compliance with applicable regulations
Maintenance
Page 16
Summary of Contents for COBRA AC 1000 F
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