Hitachi CR21N, Instruction Manual

Page: 96 / 112

4-2
This refrigerated centrifuge has a self-diagnosis capability that identifies and reports a problem that occurs
when the instrument is starting up or in operation, and that affects the operation of the instrument.
4-1 Alarm Messages
When a problem occurs that affects instrument operation, the centrifuge beeps and displays
corresponding alarm message, in order to report the occurrence of the problem.
(1) Corrective actions
In response to the displayed alarm message, take the appropriate actions as described below to
remove the cause of the problem and then press the CE button to restart the centrifugation.
WARNING
：
Unspecified repairs, remodeling or disassembly of the centrifuge that is not listed below is
strictly prohibited by any person other than a Hitachi Koki authorized services representative.
After taking the actions, if the problem still persists, contact a Hitachi Koki authorized sales/service
representative to ask for repair.
Alarm message Cause Corrective action
POWER FAILURE A power failure occurred while the rotor was
spinning and the speed decreased by 300
rpm from the set speed.
If the rotor is rotating at 250 rpm or more
when the power is restored,
the centrifuge will accelerate again or
decelerate if the speed is less than 250 rpm. Check the run time if the rotor has stopped
and restart operation if necessary.
SET ROTOR COVER
OR ROTOR Operation is started without mounting
the rotor cover. Mount the rotor cover properly.
START button is pressed when no rotor is
installed.
Install the rotor.
The sensor on the back of the door
becomes wet. Wipe the sensor with a soft cloth.
INVALID ROTOR
The rotor in use is not registered in
the centrifuge. Register the data of the rotor (refer to
Section2-6-4 (4) for details).
The sensor on the back of the door
becomes wet. Wipe the sensor with a soft cloth.
Use the rotor without the adapter Use the rotor with the adapter
TEMP TEMP display shows a temperature over
50 ºC, or a temperature lower or higher (plus
or minus 20 ºC) than the set temperature. Lower the room temperature if it is over 40
ºC.
CLOSE DOOR START button is pressed with the door
opened. Close the door and start operation.
INVALID SPEED Rotor speed or RCF is set higher
than the maximum allowable speed or RCF. Set the speed or RCF within the permitted
limits.
SELECT ROTOR Incorrect rotor is selected. Check the rotor and select the correct
rotor.
A rotor other than those saved in the
program is used.
IMBALANCE Rotor is not properly balanced. Check if the sample tubes exceed
allowable imbalance level.
Rotor cover is not properly secured. Secure the rotor cover properly.
ROOM TEMP The room temperature is over 40 ºC. In order that the room temperature will be
less 40 ºC, lower the room temperature.
E10
～
95
The centrifuge has a problem required
maintenance by service personnel. Contact a Hitachi Koki service
representative.
4-1 Alarm Messages
Fig.4-1 Displaying an alarm message
Alarm message