KAESER KOMPRESSOREN EPC-2-G Series, Сборка и руководство по эксплуатации, Страница: 53 / 96

7.4 Motor overload protection
The machine should only be operated with a correctly adjusted motor overload protection switch to
protect the motor from overloading.
A motor overload protection switch that is set too high provides no protection. Incorrect setting can
lead to irreparable damage.
7.4.1 Checking the motor protection device
1. Read the rated motor current from the nameplate and calculate the correct protection setting.
2. Check the motor protection setting.
3. Adjust the protection setting, if necessary.
Direct online starting Star-delta starting
The machine starts directly and is controlled by
the user's pressure switch. The pressure switch
switches the machine on and off as necessary to
hold pressure within the set limits.
The overload protection device setting can be
10 % higher than the rated motor current to
prevent it from being triggered by voltage fluc‐
tuations, temperature influences or compo‐
nent tolerances.
1. Switch the machine on with the user's pres‐
sure switch.
Was the machine shut down by the motor protec‐
tion cut-out?
➤ Allow the motor to cool down.
➤ Switch the machine on.
See also chapter 8.
In the star-delta configuration the phase current
is fed via the motor overload protection device.
This phase current is 0.58 times the rated motor
current (see motor nameplate).
The overload protection device setting can be
10 % higher than the rated phase current to
prevent it from being triggered by voltage fluc‐
tuations, temperature influences or compo‐
nent tolerances.
1. Switch the machine on from the external con‐
trol unit.
Was the machine shut down by the motor protec‐
tion cut-out despite correct setting?
➤ Contact the KAESER
Service.
7.5 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. 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 arrow on the fan cowl.
➤ If the direction is incorrect, reverse L1 and L2.
7.6 Starting the Machine for the First Time
Precondition No personnel are working on the machine.
All panels are in place and secured.
7 Initial Start-up
7.4 Motor overload protection
No.: 9_5753_04 E
Assembly and operating manual 2-stage piston compressor
EPC-2-G
43