9 Fault Recognition and Rectification
9.1 Basic instructions
The following tables are intended to assist in locating faults.
There are 3 types of fault:
■ Alarm: red LED flashes - see chapter 9.2.
■ Warning: yellow LED lights- see chapter 9.3.
■ Other faults: no indication - see chapter 9.4.
The messages valid for your machine are dependent on the controller and individual equipment.
1. Do not attempt fault rectification measures other than those given in this manual!
2. In all other cases:
Have the fault rectified by an authorized KAESER service representative.
9.2 Alarm messages (machine shut down)
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
Symbol
Meaning
Remedy
1
EMERGENCY STOP push-button
pressed.
Interlocked access door open or
panel (if present) removed.
➤ Unlatch the EMERGENCY STOP
push-button
➤ Close the access door or fit the panel.
2
Motor alarm
Overload protection of drive or fan
motor (if fitted).
On machine with frequency-control‐
led drive:
Alarm in the frequency converter.
➤ Check the setting of the overload pro‐
tection cut-out / motor overload pro‐
tection switch.
➤ Change the oil separator cartridge.
➤ Check minimum pressure/check
valve.
➤ Have the frequency converter
checked by an authorised KAESER
service representative.
3
There is build-up of back pressure:
■ incorrect direction of motor rota‐
tion
■ drive belts parted
■ Compressor not venting correct‐
ly at STANDSTILL
■ 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 authorised
KAESER Service Technician.
9
Fault Recognition and Rectification
9.1
Basic instructions
56
Service Manual Screw Compressor
ASK T SIGMA CONTROL BASIC
9_5717 20 E
