Hermle Z 306 User manual

© Hermle Labortechnik GmbH Service Manual Z 306 V2.13/2013
Service Manual
for
Universal Centrifuge
Z 306

CONTNET
© Hermle Labortechnik GmbH Service Manual Z 306
Content
8. Technical Data.......................................................................................................................1
8.1 Acceleration times Z 306 (120 V / 230 V) in min/sec .............................................................................................. 1
8.2 Decelertaion times Z 306 (120 V / 230 V) in min/ sec ............................................................................................. 2
8.3 Imbalance shut off data Z 306 (120V / 230 V )......................................................................................................... 3
9. Service Instructions ...........................................................................................................4
9.1 General technical description........................................................................................................................... 4
9.2 Electrical and electronically components ....................................................................................................... 4
9.2.1 Power board.................................................................................................................................................... 4
9.2.2 Control board................................................................................................................................................... 5
9.2.3 LCD Display .................................................................................................................................................... 6
9.2.4 Control panel................................................................................................................................................... 7
9.2.5 Frequency converter........................................................................................................................................ 8
9.2.6 Rotor recognition ............................................................................................................................................. 8
9.2.7 Over speed protection ..................................................................................................................................... 9
9.2.8 Speed signal.................................................................................................................................................... 9
9.2.9 Lid contact....................................................................................................................................................... 9
9.2.10 Imbalance detection ...................................................................................................................................... 10
9.3 Operation/service menu.................................................................................................................................. 11
9.3.1 Activation of the operation menu (Part 1)...................................................................................................... 11
9.3.1.1 Submenu motor starts .......................................................................................................................... 13
9.3.1.2 Submenu duty cycle ............................................................................................................................. 13
9.3.1.3 Submenu running time of the motor ..................................................................................................... 14
9.3.1.4 Submenu software status ..................................................................................................................... 14
9.3.1.5 Submenu software status of the frequency converter:.......................................................................... 15
9.3.1.6 Submenu error memory........................................................................................................................ 15
9.3.1.7 Submenu setup of the signal transmitter .............................................................................................. 16
9.3.1.8 Submenu setup of the keypad tone ...................................................................................................... 17
9.3.1.9 Submenu setup volume of the signal generator ................................................................................... 18
9.3.1.10 Submenu Setup of the signal melody................................................................................................... 19
9.3.1.11 Submenu Check and calibration of the imbalance sensor (Movement sensor Setup of the signal
melody) 20
9.3.1.12 Submenu Indication of the imbalance value of the rotor....................................................................... 21
9.3.1.13 Submenu keyboard test........................................................................................................................ 22
9.3.1.14 Submenu indication of the revision number of the control panel; Check of the external imbalance
sensor 22
9.3.2 Activation of the service menu (Part2)........................................................................................................... 23
9.3.2.1 Submenu Adjustment of the centrifuge type......................................................................................... 23
9.3.2.2 Submenu adjustment of the operation mode........................................................................................ 24
9.3.2.3 Submenu Adjustment/Correction of the imbalance cut off value: ......................................................... 25

CONTENT
© Hermle Labortechnik GmbH Service Manual Z 306
9.4 Mounting support ............................................................................................................................................ 27
9.4.1 Replacing the front housing, the incremental shaft encoder (potentiometer) and the display ....................... 27
9.4.2 Replacing the incremental shaft encoder (potentiometer)............................................................................. 28
9.4.3 Replacing the display .................................................................................................................................... 28
9.4.4 Replaicing the foil keyboard .......................................................................................................................... 29
9.4.5 Removing the housing................................................................................................................................... 29
9.4.6 Replacing the lid gasket ................................................................................................................................ 30
9.4.7 Removing the lid............................................................................................................................................ 31
9.4.8 Replacing the hinges..................................................................................................................................... 31
9.4.9 Replacing the aerial (antenna or rotor sensor).............................................................................................. 31
9.4.10 Replacing the motor resp. the motor rubber bearings ................................................................................... 32
9.4.11 Replacing the power board............................................................................................................................ 35
9.4.12 Replacing the frequency converter................................................................................................................ 35
9.4.13 Checkup the imbalance sensor ..................................................................................................................... 36
9.4.14 Replacing the control board........................................................................................................................... 36
9.4.15 Replacing the break resistance ..................................................................................................................... 36
9.4.16 Replacing the signal generator...................................................................................................................... 37
9.4.17 Replacing the lid lock..................................................................................................................................... 38
10. Trouble Shouting ..........................................................................................................39
10.1 Error messages: Cause / Solution ................................................................................................................. 39
10.2 Survey of possible error messages and their solutions .............................................................................. 39
10.2.1 Lid release during power failure .................................................................................................................... 39
10.2.2 Description of the error message system...................................................................................................... 40
10.2.3 Errors that may be indicated in the LCD display ........................................................................................... 40
11. Maintenance ..................................................................................................................42
11.1 Maintenance and cleaning.............................................................................................................................. 42
11.1.1 General.......................................................................................................................................................... 42
11.1.2 Cleaning and disinfection of the unit.............................................................................................................. 43
11.1.3 Cleaning and disinfection of the rotor............................................................................................................ 43
11.1.4 Disinfection of aluminium-rotors .................................................................................................................... 43
11.1.5 Disinfection of PP-rotors................................................................................................................................ 43
11.1.6 Glass breakage ............................................................................................................................................. 44
11.1.7 Service life of rotors, round and rectangular buckets, accessories ............................................................... 44
12. Flow diagrams...............................................................................................................45
12.1 Flow diagram 230 V / 120 V / 50-60 Hz, page 1.............................................................................................. 45
12.2 Flow diagram 230 V / 120 V / 50-60 Hz, page 2.............................................................................................. 46
12.3 Control board................................................................................................................................................... 47
13. Spare part list ................................................................................................................48

TECHNICAL DATA
© Hermle Labortechnik GmbH Service Manual Z 306 1
8. Technical Data
8.1 Acceleration times Z 306 (120 V / 230 V) in min/sec
Rotor-Number
Level 0
Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8
Level 9
220.50 V06
1:55
0.59
0.40
0:31
0:26
0:21
0:19
0:17
0:14
0:14
220.72 V06
1:40
0:52
0:35
0:26
0:21
0:18
0:16
0:15
0:13
0:11
220.87 V09
3:18
1:38
1:06
0:50
0:40
0:33
0:29
0:26
0:23
0:23
221.54 V02
1:42
0:50
0:34
0:26
0:21
0:18
0:15
0:14
0:14
0:14
221.55 V02
1:41
0:51
0:34
0:26
0:21
0:18
0:15
0:14
0:14
0:14
221.12 V03
1:52
0:57
0:39
0:29
0:24
0:20
0:18
0:16
0:14
0:14
221.16 V03
3:48
1:55
1:19
1:01
0:47
0:40
0:35
0:30
0:28
0:25
221.17 V03
4:13
2:01
1:21
1:02
0:50
0:42
0:36
0:32
0:29
0:26
221.18 V02
6:21
3:09
2:08
1:37
1:16
1:05
0:57
0:49
0:44
0:40
221.19 V02
2:36
1:16
0:50
0:39
0:32
0:27
0:24
0:21
0:19
0:19
221.24 V02
1:35
0:46
0:32
0:26
0:20
0:17
0:15
0:14
0:12
0:11
221.25 V03
3:32
1:43
1:11
0:51
0:43
0:36
0:32
0:27
0:25
0:24
221.87 V10
3:19
1:39
1:07
0:50
0:40
0:34
0:30
0:26
0:25
0:25
Table 1: Acceleration times

TECHNICAL DATA
© Hermle Labortechnik GmbH Service Manual Z 306 2
8.2 Decelertaion times Z 306 (120 V / 230 V) in min/ sec
Rotor-Number
Level 0
Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8
Level 9
220.50 V06
4:11
1:03
0:43
0:34
0:28
0:24
0:22
0:20
0:19
0:17
220.72 V06
1:40
0:55
0:34
0:30
0:25
0:22
0:19
0:17
0:18
0:16
220.87 V09
3:33
2:33
1:43
1:18
1:03
0:54
0:47
0:42
0:37
0:34
221.54 V02
3:25
0:40
0:27
0:22
0:19
0:17
0:15
0:14
0:12
0:11
221.55 V02
3:25
0:39
0:27
0:22
0:19
0:17
0:15
0:14
0:12
0:11
221.12 V03
2: 51
0:52
0:39
0:31
0:28
0:25
0:22
0:22
0:20
0:19
221.16 V03
5:18
1:35
1:04
0:50
0:41
0:36
0:32
0:28
0:26
0:25
221.17 V03
4:39
2:35
1:43
1:18
1:02
0:53
0:46
0:41
0:37
0:33
221.18 V02
12:53
6:26
4:18
3:13
2:37
2:10
1:52
1:39
1:26
1:18
221.19 V02
6:10
0:49
0:34
0:28
0:25
0:23
0:22
0:20
0:18
0:18
221.24 V02
2:57
0:45
0:31
0:25
0:22
0:19
0:17
0:16
0:16
0:14
221.25 V03
9:34
2:10
1:27
1:06
0:53
0:45
0:40
0:36
0:32
0:30
221.87 V10
3:49
2:33
1:43
1:18
1:04
0:54
0:47
0:42
0:37
0:35
Table 2: Deceleration times
The acceleration and deceleration times may have slight fluctuations that depend on the unit and are therefore
guidelines only.

TECHNICAL DATA
© Hermle Labortechnik GmbH Service Manual Z 306 3
8.3 Imbalance shut off data Z 306 (120V / 230 V )
All rotors are set by the work of using motion detectors. They cannot be adjusted.
Rotor-Number
Shut off speed in rpm
Permitted imbalance in
gram
Imbalance shut off in gram
220.50 V06
890
8
9
220.72 V06
580
20
26
220.87 V09
890
4
5
221.54 V02
780
8
8
221.55 V02
940
8
6
221.12 V03
800
14
10
221.16 V03
970
8
7
221.17 V03
11800
4
4
221.18 V02
4750
4
3
221.19 V02
3700
4
7
221.24 V02
900
12
31
221.25 V03
1040
16
19
221.87 V10
780
4
6
Table 3: Imbalance shut off
The shut off weight and speed may have slight fluctuations that depend on the unit and are therefore guidelines
only.

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 4
9. Service Instructions
9.1 General technical description
Model Z 306 is a micro processor controlled cooled laboratory centrifuge.
The actuation is a three phase asynchronous motor which is controlled by frequency converter.
Model Z 306 has an independent error detection program, displaying possible errors and therefore
supporting the trouble shooting process.
The unit is equipped with several safety features:
•Imbalance detection
•Motor over temperature protection
•Lid lock does not open until the standstill of the centrifuge
•Rotor over speed protection
•Sample over temperature after the end of a run
Please follow below mentioned safety instructions for any kind of service actions:
•The capacitor of the frequency converter can be under voltage even when the unit is switched
off.
•Do not leave units unsupervised, when parts of the housing have been removed and the
unit is still connected to the main power supply.
•Do not bypass the lid’s safety contacts and never work with the unit’s lid open.
•The VDE regulations are valid for all electrical work that has to be done.
9.2 Electrical and electronically components
9.2.1 Power board
The power board is serving the low voltage supply of the centrifuge control system. The power board
is electrically isolated and has a dielectric strength of DC 2.2 kV.
Figure 1: Power board

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 5
9.2.2 Control board
The control board consists of one plate. The board can only be exchanged completely. If there is a
defect you have to exchange the complete board.
All signal lines lead to the control board.
The PCB controls the entire centrifuge.
Figure 2: Control board

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 6
9.2.3 LCD Display
The following picture shows the individual elements of the LCD-display.
Figure 3
Display fields:
A-1 Display field –„rpm/rcf“
A-2 Display field –„acc/dec“
A-3 Display field –„time“
Messages/logos of the display fields:
M1 „close“ M8 „decel“
M2 „open“ M9 „radius“
M3 „rotor“ M10 „program“
M4 „Rotor-No. “M11 „error“
M5 „rpm“ M12 „service“
M6 „rcf“ M13 h m s
M7 „accel“

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 7
9.2.4 Control panel
The control panel consists of one LCD-display, one potentiometer (1), the upper front housing and the
foil keyboard. These parts can be exchanged separate. The potentiometer (1) regulates all parameters
which are adjustable by pressing a key and which are indicated in the LCD-display. Inside the time
display of the control panel the error message is indicated if there occur any troubles.
Figure 4
1potentiometer run parameters
3LCD control panel display
4rpm/rcf speed/ g-force
5 accel/decel acceleration- / Deceleration intensity
6time centrifugation time
7 lid lid release
8quick short running
9start start centrifugation
10 stop stop centrifugation
11 prog calling stored programs
12 store program store

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 8
9.2.5 Frequency converter
The frequency converter generates the drive signals for the asynchronous motor.
The converter leads the current generated by the motor during deceleration to a heating resistor to
reduce the current.
The frequency converter is connected with the power board by a serial interface.
There is a green LED on the converter which light up when the frequency converter is working
correctly.
A defect of the converter will be indicated in the TIME display as an error no. (See chapter 10).
Figure 5
9.2.6 Rotor recognition
The centrifuge will recognize the inputted rotor through the rotor identification transponder and the
aerial belonging to it right after the insert automatically. As soon as the lid is closed the rotor number
will be indicated in the speed display (see figure 3).
Figure 6
Transponder
Figure 7

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 9
9.2.7 Over speed protection
If the pre-selected rpm is higher as the permitted rpm of the rotor, the speed indication in the display
will be regulated to the max. speed permitted for this rotor after the rotor recognizion.
The regulation will accelerate the rotor only to the permitted rpm of the rotor.
9.2.8 Speed signal
The actual speed is extracted by a hall-effect-sensor placed on the lower side of the motor.
There is a “preset/actual“ comparison in the control board. Thereupon a new “actual-signal”is given
by the control board to the converter.
(see figure 8)
Figure 8
9.2.9 Lid contact
The micro switch in the mechanism of the lid lock controls the correct closing of the centrifuge lid.
The switch may never be bypassed.
The lid lock is unlatched by an electro motor, receiving its signal from the control board.
The actual state is indicated in the display (see M1, M2).
Figure 9

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 10
9.2.10 Imbalance detection
The imbalance detection is done in two ways.
A micro switch, controls for certain rotors, the displacement of the motor and shut off if there is too
much imbalance. The micro switch should be adjusted according to the instruction of the company.
(see chapter 9.4.13. and table 3).
A movement sensor, which is mounted underneath the motor, is controlling the oscillating motion of
the motor. The unit stops when the oscillating motions are too strong. Setup data specified by the
manufacturer for rotors controlled by the movement sensor cannot be changed.
Figure 10
Figure 11
Chapter 9.2.10
Chapter 9.2.7

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 11
9.3 Operation/service menu
Valid for the units of the category with frequency converter.
Units: 20r, Z 216MK, Z 32HK, Z 326K, Z 326, Z 36HK, Z 366, Z 306, Seta2
The operation menu helps the service personnel to locate defects. It is divided in two parts, which
are graded in several areas again from chapter 9.3.1 to 9.3.2.2.
Part 1 is accessible for the USER and different points can be read respectively settled. This is also
described in the instruction manual.
Part 2 is for internal use respectively for trained service personnel outdoors Hermle LaborTechnik
only. The control board can be adjusted to different units. Here the different parameters are
determined on the respective unit after an exchange of the control board.
9.3.1 Activation of the operation menu (Part 1)
The menu can be started as follows:
•Open lid of the centrifuge and switch off main switch.
•From software version 1.58 press the key „time“ (6) and „lid“ (7) hold them and at the same time
switch on the unit.
Figure 12
•After the indication displays flash on, led go off the keys „time“ (6) and „lid“ (7).
In the display “rpm/rcf“ (4) the stored type of the centrifuge (i.e. 216 see figure 12) and below a letter
(i.e. c, see figure 12) is indicated for about 2 seconds. The letter stands for the different versions of
the units (see 9.3) which are currently stored in the control board:
cfor cool
hfor heat
no for nothing

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 12
Now it follows a display test for about 5 seconds as shown here under in figure 13.
Figure 13
Now you have entered the Service mode. By pressing the key „accel/decel“ (5) you will get to the
submenus.
Now in the display “acc/dec“ (A-2) the word “service“ (M12) will flash. Only as long as this word is
flashing, you can scroll through the further submenus with the potentiometer (1).
You have to repeat this step continously to enter the different submenus!

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 13
9.3.1.1 Submenu motor starts
Here you can read off the number of motor starts.
•Activate the operation menu as described in chapter 9.3.1.
•Turn the potentiometer (1) until the special digit “service A“ appears in the display „acc/dec”
(A-2), see figure 14.
Figure 14
In the display “rpm/rcf“ (A-1) the number of motor starts is indicated now.
9.3.1.2 Submenu duty cycle
Here you can read off the duty cycle of the unit.
•Activate the operation menu as described in chapter 9.3.1.
•Turn the potentiometer (1) until the special digit “service H“appears in the display “acc/dec”
(A-2).
Figure 15
Inside the display “rpm/rcf“ (A-1) now the duty cycle is indicated.

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 14
9.3.1.3 Submenu running time of the motor
Here you can read off the operating hours of the motor.
•Activate the operation menu as described in chapter 9.3.1.
•Turn the potentiometer until the special digit “service h“appears in the display “acc/dec” (A-2).
Figure 16
In the display “rpm/rcf“ (A-1) the running time of the motor is indicated now.
9.3.1.4 Submenu software status
Here you can read off the software status.
•Activate the operation menu as described in chapter 9.3.1.
•Turn the potentiometer (1) until the special digit ”service S“appears in the display „acc/dec”
(A-2).
Figure 17
In the display “rpm/rcf“ (A-1) the actual software status is indicated now.

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 15
9.3.1.5 Submenu software status of the frequency converter:
Here you can read off the software status of the frequency converter.
•Activate the operation menu as described in chapter 9.3.1.
•Turn the potentiometer (1) until the special digit „service r“appears in the display „acc/dec” (A-2).
Figure 18
In the display „rpm/rcf“ (A-1) the actual software status of the frequency converter is indicated now.
9.3.1.6 Submenu error memory
Here the last 99 occurred error messages can be indicated.
•Activate the operation menu as described in chapter 9.3.1.
•Turn the potentiometer (1) until the special digit “service E“appears in the display “acc/dec”
(A-2).
Figure 19
•By pressing the key „rpm/rcf“ (4) the display “rpm/rcf“ (A-1) is activated and you can scroll
through the error list with the potentiometer (1).
•Now the last 99 occurred error messages are indicated in the display “rpm/rcf“ (A-1). Whereas
the first two digits describe the place number and the last two digits do describe the occurred
error. Look at chapter 10.2.3 "Errors that may be indicated in the LCD display".

SERVICE INSTRUCTIONS
© Hermle Labortechnik GmbH Service Manual Z 306 16
9.3.1.7 Submenu setup of the signal transmitter
Here you can switch on resp. switch off the signal transmitter (audible sound).
•Activate the operation menu as described in chapter 9.3.1.
•Turn the potentiometer (1) until the special digit “service L“appears in the display “acc/dec”
(A-1).
Figure 20
•By pressing the key rpm/rcf (4) the display „rpm/rcf“ (A-1) is now activated and you can setup the
respective option with the potentiometer (1).
•Now the audible sound is activated resp. not activated by the end of the run or when an error
message will occur.
Attention: In case that the signal transmitter is switch off, the keypad tone and the audible error
message will also be suppressed.
The keypad tone has to be switched on again after the reactivation of the signal transmitter.
However the audible error message is automatically activated if the signal transmitter has been
reactivated.
Attention: After all points have been reviewed and/or set up, you have to press shortly the key
"start" (9) to store all parameters. Otherwise the setups were all for nothing. If the storage has been
successful in the display “rpm/rcf“ (A-1) the value of the imbalance sensor and the word “StorE“ are
indicated.
Figure 21