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)
Message Possible cause Remedy
blowoff prot. ⇞ The activating pressure of the pressure
relief valve on the oil separator tank has
been exceeded.
Change the oil separator cartridge.
Open the shut-off valve in the venting
line.
AI1 open cct.
AI2 open cct.
Analog input open circuit.
Short to earth.
Check line and connections.
AI1 short cct.
AI2 short cct.
The connection between the sensor
and the analog input is shorted.
Check line and connections.
AI3/AI4 error Line-break between the analog input
and the sensor.
Short circuit to earth.
Check line and connections.
AI5 open cct.
AI6 open cct.
Analog input open circuit.
Short to earth.
Check line and connections.
AI5 short cct.
AI6 short cct.
The connection between the sensor
and the analog input is shorted.
Check line and connections.
AI7/AI8 error Line-break between the analog input
and the sensor.
Short circuit to earth.
Check line and connections.
model Compressor model uncertain Call KAESER Service.
PD T⇞ Package discharge (PD) temperature
too high.
Check the cooling oil level.
Clean the cooler.
Check the fan motor.
PD T⇟ Package discharge (PD) temperature
too low.
Call KAESER Service.
DO0.6/DO0.7 I⇞ Short circuit in the line between the dig‐
ital output and the consumer.
Check line and connections.
9 Fault Recognition and Rectification
9.1 Basic Information
9_5708 08 USE
Service Manual Screw Compressor
BSD
53
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