Special chapter for service technicians
2 --- 6
2 Special Chapter for Service Technicians
2.1 Setting operating hours and hours under load counters
Both counters can be set as long as their readings are between 1h and 5h,
i.e. if the reading is 5h it can no longer be changed.
2.2 Passwords
Activating the relief valve test requires the password “BASIC”
The maximum operating pressure can be changed by Kaeser Service with the password
“CERES” (only necessary when modifying the machine for a different pressure).
2.3 Changing the units of measurement for the airend discharge tempera-
ture or system pressure
The temperature and pressure readings will not be updated as long as the change mode is
active and the units selected.
2.4 Power failure
When power is restored, the controller resumes its previous state, i.e. the compressor
starts automatically and any current faults remain registered.
2.5 Refrigeration dryer operating mode
Continuous (off)
The dryer runs as long as the controller is switched on, i.e. also if the compressor is in
standby mode.
Impulse timer (on)
The dryer runs so long as the compressor is running. When the compressor switches
to standby the dryer runs on for one minute then switches off for ten minutes. This
cycle (1 min / 10 min) continues until the compressor restarts.
2.6 Resetting the maximum working pressure is done only after machine
modification.
A change can only be made by means of the Kaeser Service password “CERES”.
2.7 Starting sequence
Compressor motor start
Star---delta start
1. Refrigerant compressor on
2. if the refrigeration compressor relay answer---back contact is closed,
star contactor on
3. after 0.3 seconds
mains contactor on
4. after 6.0 seconds (star time)
star contactor off
5. after 0.03 seconds
delta contactor on
6. after 1.0 seconds
load valve open
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