7.4 Setting the overload protection cut-out
Direct online starting (SX 3 only)
In direct online starting, the motor supply current is fed via the overload protection cut-out (see name‐
plate on the control cabinet for motor nominal current).
To prevent the overload protection cut-out from being triggered by voltage fluctuations, tem‐
perature influences or component tolerances, the setting can be higher than the rated motor
current.
➤ Check the overload protection cut-out setting.
The overload protection cut-out shuts the machine down despite being correctly set?
➤ Contact KAESER Service.
Wye-delta starting
In wye-delta start the phase current is fed via the overload protection cut-out. This phase current is
0.58 times the rated motor current (see nameplate in the control cabinet).
To prevent voltage fluctuations, temperature influences or component tolerances operating the
overload protection cut-out, the setting can be higher than the arithmetical phase current.
➤ Check the overload protection cut-out setting.
The overload protection cut-out shuts the machine down despite being correctly set?
➤ Contact KAESER Service.
7.5 Hot gas bypass valve setting
The machine is designed for use at a maximum altitude of 10 000ft.
CAUTION
Higher altitude.Frozen condensate can damage the dryer.
➤ An adjustment must be made to the hot gas bypass valve if the dryer is used at altitudes above
3000ft.
7
Initial Start-up
7.4
Setting the overload protection cut-out
40
Service manual Screw compressor
Aircenter SX 3/7.5 SIGMA CONTROL BASIC
Number: 9_6945 01USE
Option C17
