2. Pour the stipulated amount of cooling oil into the airend and replace the filler plug.
3. Turn the rotors manually by means of the belt pulley to distribute the oil.
7.7 Checking direction of rotation
The machine is designed for a clockwise phase sequence.
Ideally, the direction of phase rotation should be measured with a phase sequence meter.
Alternatively, the machine can be started very briefly and the rotation direction of the motor cooling
fans noted.
1. Check the direction of phase rotation with a phase sequence meter.
2. If the direction is incorrect, reverse supply phases L1 and L2.
You have no phase sequence meter?
➤ Switch the machine on and off again the moment the drive motor begins to turn.
➤ Compare the direction of rotation of the motor with the arrows on the motor and the airend
casing.
➤ If the direction is incorrect, reverse supply phases L1 and L2.
7.8 Starting the machine for the first time
Precondition No personnel are working on the machine
all access doors are closed,
all removable panels in place and secured.
1. Open the shut-off valve to the air network.
2. Switch on the power supply disconnecting device.
After the controller has carried out a self-test, the green
controller ON LED lights continuously.
3. Press the «ON» key.
The green
Machine ON LED lights continuously.
The drive motor runs up and after a short time the machine switches to LOAD and delivers com‐
pressed air.
➤ Keep an eye on the machine during the first few hours of operation to ensure that it is
operating correctly.
➤ After the first 50 operating hours, check all electrical connections and tighten where nec‐
essary.
Recognizing damaging condensate
Machines of this type are generally only lightly utilized. Condensate can build up in lightly utilized
machines with detrimental effects to the cooling oil and the machine itself. You can determine if your
machine falls into this category by regular sampling of the cooling oil during the first week of operation.
➤ Make sure you are familiar with the procedure before draining off any oil.
➤ A small quantity of cooling oil should be drained out to check for condensate at least once a week
during the first 4 weeks of operation.
7
Initial Start-up
7.7
Checking direction of rotation
Number: 9_6945 01USE
Service manual Screw compressor
Aircenter SX 3/7.5 SIGMA CONTROL BASIC
43
