9 Fault Recognition and Rectification
9.1 Basic Information
The following tables are intended to assist in locating causes of faults.
There are three types of fault:
■ Alarm: red LED flashes - see chapter 9.2.
■ Warning: yellow LED flashes - see chapter 9.3.
■ Other faults: no indication - see chapter 9.4.
The messages valid for your machine are dependant on the controller and individual equipment.
1. Do not attempt fault removal measures other than those given in this manual.
2. In all other cases:
have the fault rectified by an authorized KAESER Service representative agent.
9.2 Alarm messages (machine stop)
The fault code appears in the 4th line of the display field.
A sticker with symbols on the machine explains the fault code.
Fault
code
Sign
Meaning
Action
1
EMERGENCY STOP pushbutton
pressed.
Interlocked access door open or panel
removed.
➤ Unlatch the EMERGENCY STOP
pushbutton
➤ Close the access door or fit the panel.
2
Motor alarm
Overload protection of drive or fan mo‐
tor (if fitted).
Frequency-controlled machines
Alarm in the frequency converter.
➤ Check overload protection cut-out /
motor overload protection switch set‐
ting.
➤ Change the oil separator cartridge.
➤ Check minimum pressure/check
valve.
➤ Have the frequency converter
checked by an authorized KAESER
service representative.
3
There is build-up of back pressure:
■ incorrect direction of motor rota‐
tion
■ drive belts parted
■ compressor not venting correctly
atSTANDSTILL.
■ Back-pressure switch defective
Brief interruption of power supply.
➤ Changeover phase lines L1 and L2.
➤ Replace drive belts.
➤ Have the frequency converter
checked by an authorized
KAESER Service Technician.
9
Fault Recognition and Rectification
9.1
Basic Information
50
Service manual Screw compressor
Aircenter SX 3/7.5 SIGMA CONTROL BASIC
Number: 9_6945 01USE
