Heraeus Megafuge 1, Megafuge 2 User manual

MEGAFUGE 1.0S
MEGAFUGE 1.0RS Operating instructions
MEGAFUGE 2.0RS User interface "Sepacontrol"

User interface "Sepacontrol"

User interface "Sepacontrol"

The user interface "Sepacontrol" from Heraeus is designed for programming and using the operating func­tions. The present description substitutes the corresponding section of your operating instructions.

The figure below shows the user interface of the Megafuge 1.0RS, which is described in detail below. On
the last page of the Appendix you will find the same figure enlarged to full-page size.

Key-operated switch

left and right digit selection, respectively

setpoint

display,
temperature,
over­temperature

setpoint setting setpoint setting

setpoint

change

set

+

–

enter

copying

into working

memory

open lid

lid

quick

run

start
stop

INSTRUMENTS

start/stop key

lid release

Quick Run

release

Quick Run
"ready for

start"
display

stop
release

system

check

programming

error

over-

temperature

key-operated switch

progr.mode

C

BA

Megafuge 1.0RS

program number selection

diagnostic
LEDs

lid open

check lid
imbalance

system check
progr.error

overtemp.

storage in memory

program display

unbalance

display
display
acceleration/
braking
curves

store
mode

accel
decel

select

call
program
storage
mode

program

execute select select select

RCF,

rotor type,

radius,

special

messages

speed
rcf delay ∆t

rotor

radius

"select" keys

run time,
start
delay

time temp

run time
start delay

time temp

operating temperature
overtemperature

acceleration
deceleration

accel
decel

speed
RCF

rotor type
radius

speed
rcf delay ∆t

rotor

radius

assignment LEDs

You can use the key-operated switch to set the operating mode of "Sepacontrol".

Position A: Unlimited programming. You can call or change all programs.

Position B: The program memory is protected against modifications. However, the current centrifugation

program in the main memory can still be modified.

Position C: Program and main memory are protected against modifications. The preset centrifugation

program can be run an unlimited number of times by actuating the control keys.
The setpoints can be displayed any time by pressing "set" or the select key ("select").

You can pull out the key in any position. The respective setting is then valid until the next modification.

If you are in a hurry:
Setting the centrifugation conditions without storing the parameters.

Prerequisites: The centrifuge is properly installed, the rotor correctly loaded and balanced, the key­operated switch in position A or B.

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User interface "Sepacontrol"

General procedure for all "select" fields:

• Press the "set" key. The display selected for the previous run flashes.

• Press the "select" key under the desired function field until the red LED next to the parameter to be

changed (e.g. "temp") is lit. Choose the digit to be altered by briefly pressing one of the direction keys
to the left and right of the "set" key (

+

count by pressing the

- or – key until the desired number is displayed.

set

) (repeatedly if necessary), and increase or decrease the

• By briefly pressing the key you increase or decrease the chosen digit by one step at a time. If you
press and hold the chosen key, the display changes continuously upward and downward, respec­tively. Release the key as soon as you have reached the desired value, and fine-tune if necessary by
repeatedly pressing the key.

• Acknowledge each entry by pressing "enter".

To enter parameters:

1. Press first the "set" and then the "select" key under the four-function field ("speed", "rcf", "rotor", "ra­dius") until the red LED next to "rotor" is lit, and enter the order number of the rotor (only possible when
centrifuge is at rest).

Entering the rotor order number is mandatory. The built-in electronics uses this information to rec-

ognize the maximum permissible speed and sees to it that it is not exceeded.

2. Optional: Choose one of the accelerating and braking curves ("accel" and "decel", respectively, possi­ble choices no. 1–9 for both, plus 0 for brakeless deceleration with "decel", see Appendix).

NOTE: If with the braking curve preset to 0, the set speed is lowered during the run, the newly set speed is

triggered with braking curve 1; the preset curve 1 remains unchanged.

3. Optional: Enter the centrifugation radius. You can set the radius in steps of 10 mm and 1 mm, respec­tively, from the nominal radius (maximum value) to the smallest radius compatible with the design.

When preselecting an RCF value (see below), the set RCF value corresponds to the radius en­tered here.

4. Set the speed, or alternatively the relative centrifugal force (RCF, in multiples of the earth gravity g). To
do this, choose the respective parameter ("speed" or "rcf") in the four-function field ("speed", "rcf", "ro­tor", "radius"), and enter the desired value.

5. Set the run time. Select "time", and enter the desired run time. The time measured is the one between
the start and the end of the braking process.

h.min: Entry and display in hours and minutes, between 0.00 and 9.59
h: Entry and display in hours, between 10 and 99
hld Continuous operation (hld = "hold")

6. Optional: Enter the desired start delay (1 min to 99 hours, display: "delay").

7. Only refrigerated centrifuges (MEGAFUGE series RS): Set the temperature to a value between 0 °C
and 40 °C.

8. Optional (only refrigerated centrifuges – MEGAFUGE series RS): Set the overtemperature control to
the desired value (minimum 5 K, upper limit set by the built-in microprocessor). The centrifuge switches
automatically off when the overtemperature is exceeded (setpoint + ∆t).

NOTE: Altered parameters are accepted by the main memory only if acknowledged with "enter" (or "start").
Otherwise, following a timeout of about 2 min (or about 20 s with the centrifuge running), the instrument
switches the display to the actual values without accepting the modifications.

Operation without program

1. Close the centrifuge lid if still open. The yellow LED next to the "lid" key is lit, the "ready for start" dis­play next to the start/stop key (green LED) is activated, and the centrifuge is ready for use.

2. Press the start/stop key. The centrifuge starts according to the factory-set default value with the accel­eration curve no. 9 (acceleration curves see Appendix). The "lid" LED goes out, the lid cannot be
opened any more. The very moment the centrifuge starts, the stop function is released (red LED next to
the start/stop key is lit).

3. Wait until the instrument stops automatically after completing the set run time ( braking curve, see Ap­pendix). However, you may stop the centrifugation any time by pressing the start/stop key. At this point
the green LED is lit anew, e. g. you can continue a manually interrupted run at any time.

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User interface "Sepacontrol"

Turning off the continuous tone after centrifugation: any key for current run, "enter" key in actual value
mode for all subsequent runs (in this case brief display "Alert off"; renewed "enter" or mains supply
ON/OFF results in "Alert on").

Display

Actual values

If none of the display panels flashes, actual values are displayed; this is true both during a centrifuge run
and at rest. The display values changes as soon as the instrument registers new actual values (e. g.
speed during a run, temperature at rest, etc.). Following a centrifuge run, the time display reads the re­maining run time (which is different from 0 only in case of premature STOP) or the run time passed (if "hld"
has been preselected). This gives the operator an opportunity to check whether the run has been prema­turely interrupted e. g. by a short-term power failure. The actual time display is overwritten with the new
actual values only following a renewed start or power OFF/ON.

By pressing the respective "select" key you can switch between the parameters (acceleration or decelera­tion, speed, RCF etc.). The LED for the currently displayed parameter is lit (see figure under "assignment
LEDs"). Further explanations see in the following section under "setpoint values".

Setpoint values

In order to display the current setpoint values, always press first the "set" key (display panels flash) and
then the key listed below as required.

Program display displays the number of the currently active program after pressing "store

mode" key (01–32)

acceleration/
braking curves

speed, RCF, rotor type,
radius

displays the number of the acceleration curve (1–9), upon pressing the
"select" key the number of the braking curve (0–9) (see Appendix)

displays the set speed, and upon pressing the "select" key successively
the relative centrifugal force (in multiples of the earth gravity g), the rotor
type (identical to the rotor or bucket order no.) and the radius setting

run time, start delay displays the set run time and upon pressing the "select" key the start

delay (if set)

temperature, overtemperature displays the temperature setpoint, and upon pressing the "select" key the

overtemperature control (if set; lowest value 5 K)

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