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P R O D U C T M A N U A L VA C U U M P U M P S E T - 1 H D S 6 8 0 6 3 2 R E V A
9 Technical information
• Set the supply voltage selector switch of the vacuum pump to the appropriate supply voltage
(110 V or 230 V) before starting work.
• For the evacuation process, the expansion tank has to be mounted in vertical position with the ball valve
upwards to the tank connection of the operating mechanism. Therefore, either the straight or the angled
pipe connection, the hydraulic hose or a combination of the different connection opportunities as well as
the attached tank connection adapters have to be used. Which of the connection opportunities is applied
depends on the type and the operation position of the operating mechanism and where appropriate.
• Hang up the expansion tank with the eyebolt to any applicable surroundings when the hydraulic hose is
used as tank connection.
• A slight over pressure (~0.6 bar) may leak through the opened tank connection of the low pressure tank
into the connected expansion tank when opening the pressure release lever/pressure release screw regularly.
• Hydraulic oil is exhausted from the low pressure tank of the operating mechanism to the expansion tank
during the evacuation process. Thereby, foam may be generated. Attention must be paid that neither the
hydraulic oil nor the foam is exhausted from the expansion tank into the vacuum pump. This may lead to
damage of the vacuum pump. To avoid this, the ball valve has to be opened temporary to create a bypass
to reduce the vacuum and let the hydraulic oil float back into the low pressure tank.
• The operating mechanism has to be ventilated according to the instruction for operation and maintenance
(e. g. 1HDH118041) after the evacuation process has been completed (cf. operating instruction step 13).
• The first 5 CO-switching operations after the completed evacuation process must not be used for evalua-
tion of the final switching characteristics (e. g. simultaneity).
• The mentioned pressure ranges are absolute pressure values (e. g. 50 mbar absolute). The provided
pressure gauge has a relative pressure sensor display. Consequently, a conversion of absolute to relative
pressure values with regard to the ambient atmospheric pressure is necessary.
10 Operating instructions
1. Open the tank connection of the low pressure tank.
2. Connect the expansion tank with any applicable connection opportunity shown in figure 3 to the tank
with the pipe connection to the tank. If necessary use one of the tank connection adapters.
3. Connect the pressure gauge to the screw connection at the expansion tank.
4. Connect the vacuum pump with the spiral hose to the fast coupling connection at the expansion tank.
Connect the power plug of the vacuum pump to the power supply.
5. Open the ball valve at the expansion tank.
6. Open the pressure release screw/lever slowly to discharge the disc spring stack.
7. Switch on the vacuum pump and lower the pressure of the hydraulic systems to ≤ 50 mbar absolute
(5 kPa absolute) by closing the ball valve slowly. Meanwhile, press the pilot valves (ON/Close and
OFF/Open) simultaneously/set the COV to inter mediate position.
8. Keep the vacuum pressure at < 50 mbar absolute (5 kPa absolute) for approx. 5 minutes.
Meanwhile, press the pilot valves (ON/Close and OFF/Open) simultaneously/set the COV to inter-
mediate position.
9. Finish the evacuation process: switch off the vacuum pump and open the ball valve slowly.
10. Disconnect the vacuum pump and the spiral hose from the expansion tank.
11. Let flow back the oil from the expansion tank to low pressure tank as far as possible.
12. Disconnect the expansion tank from the tank connection.
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03
13. Ventilate the operating mechanism. Therefore, close the pressure release screw/lever and charge the
operating mechanism fully (to PUMP OFF).
14. Check and correct the oil level according to the charts in the oil handling kit when necessary.
15. Close the tank connection again and tight it with 25 Nm.
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03 Tank connection
variants
04 Vacuum pump set,
mounted
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04
5
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