7.5 Checking the direction of rotation
The machine is designed for three-phase connection with right phase rotation.
Ideally, the direction of phase rotation should be measured with a phase sequence meter. Alterna‐
tively, start the machine very briefly and observe the direction of rotation of the motor cooling fan.
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.
➤ Check the direction of rotation against the direction arrow.
➤ If the direction is incorrect, reverse L1 and L2.
Further information Fig. 2 shows the location of the direction arrow.
7.6 Starting the machine for the first time
Precondition No personnel are working on the machine.
All panels are in place and secured.
1. Open the shut-off valve to the air network.
2. Switch on the power supply disconnecting device.
The machine switches to LOAD and delivers compressed air.
➤ Watch for any faults occurring in the first hour of operation.
Carry out the following tasks after the first 50 operating hours:
■ Check that all electrical connections are secure.
■ Change the compressor oil.
7.7 Measuring the air receiver filling time
Measuring the time the compressor takes to fill the air receiver when new can be useful in checking
the machine's performance at a later date.
Precondition Machine at operating temperature.
1. Close the shut-off valve to the air main.
2. Switch on the power supply disconnecting device.
3. Measuring the air receiver charging time
4. Insert the air receiver filling time, air receiver volume and compressor model into the table.
Compressor model
Air receiver volume (litres)
Receiver filling time
from 3 – 14.5 bar [min/s]
Tab. 33 Air receiver filling time
7
Initial Start-up
7.5
Checking the direction of rotation
56
Assembly and operating manual 2-stage piston compressor
EPC-2-G
No.: 9_5753 24 E
