Emergency Recovery From Power Failure - Hitachi CR22N Instruction Manual

2-7 Emergency Recovery from Power Failure

2-7 Emergency Recovery from Power Failure
DANGER: To avoid electrical shock hazards, follow below when servicing the centrifuge.
1) Be sure to turn off the POWER switch and turn off the distribution board of your
centrifuge room if your centrifuge is equipped with a three wire power cord. Then wait at
least three minutes and then remove covers or tables from the centrifuge.
2) Be sure to turn off the POWER switch and unplug the power cord from the receptacle if
your centrifuge is equipped with a power cord with a plug. Then wait at least three
minutes and then remove covers or tables from the centrifuge.
WARNING: 1. Never attempt to open the door while the rotor is rotating.
2. Never attempt to slow or stop the rotor by hand.
CAUTION: Do not perform any operation not specified in this manual. If any problem is found on
your centrifuge, contact a Hitachi Koki authorized sales/service representative.
(1) Rotation of rotor
The rotating rotor coasts free and finally stops if a power failure occurs during operation. When the
power is restored, the centrifuge automatically re-accelerates the rotor if the rotor is still rotating at
250 rpm or higher, or decelerates the rotor if the rotor is rotating below 250 rpm.
(2) Operation panel
During the power failure, all the displays on the control panel are off. When the power is restored, the
centrifuge will restart the control of the run with the set parameters that were in effect before the power
failure (battery-backed), and will report the occurrence of the power failure by lighting up the alarm
message.
(3) Taking out the rotor during power failure
If the power failure is continuing for a long time, and you have decided to remove the rotor from the rotor
chamber during the power failure, then take the following procedure.
WARNING: Make sure that the rotor has coasted to a complete stop. When the rotor is at rest, it
make no sound. So listen carefully for any sound coming from the rotor chamber.
Never attempt to override the door interlock system while the rotor is rotating.
It takes more than 90 minutes for the rotor to come to a complete stop when the rotor is rotating at high
speed. Before opening the door, wait until the rotor comes to a stop.
2-75