Hitachi CR21N, Instruction Manual

Page: 46 / 112

2-31
NOTE (1) Select the same rotor for each step. Otherwise, the centrifuge can not perform the step-mode
operation.
(2) Use the program No. 32 and 33 (42 and 43 or 52 and 53) for the step-mode operation with
two steps.
(3) During the step-mode operation, the following box appears in the FUNCTION area of the
Run screen.
(4) You can not store a run parameter while in running (while the rotor is rotating). Always perform
this function while not in running.
(5) To perform a combination of a step mode run with an RTC (real-time control) run (see Section
2-3-5 “RTC (real-time control) operation”), call a program, and then set RTC.
The system then calculates the total of running times of all steps of the programmed run and
calculates the startup time for RTC. You therefore cannot call a program after setting RTC.
(2) Other procedures
1) Making changes to the run parameters
Call the program you want to make changes to and make the changes. Alternatively, delete the
program, then store a new set of run parameters.
2) What if a SPEED alarm goes on?
If a step stores a speed exceeding the maximum allowable speed of your rotor, the system will detect
it in the STEP1 run and display the SPEED alarm.
Double-check the speed of all steps and correct any wrong ones.
3) Stopping the centrifuge in operation
Press STOP button. The rotor stops and the system does not move to the next step.
Current status
(The centrifuge is performing the
operation under the conditions of the
program whose program No. is 31.)
Specified setting
(The centrifuge automatically performs
step-mode operation in order of the
program No.31, 32, and 33.)
Fig. 2-3-2 (2) A Typical Box Which Appears During Step-Mode Operation
2-3-2 Step-Mode Operation