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10.5
Removing Motor (M1) / Rubber-metal bearings / Speed sensor (B2.1, at
the bottom of the motor) / Imbalance sensor (B2.2)
•
Remove the front panel and the support sheet for electronics (A1) as described in
chapters 10.1, 10.2, pg. 80.
•
Pull the plugs S104 and S701 on the electronics (A1), see pg. 93, chapter 11.3.
•
Remove all required fixations of the cables.
•
Dismount the rotor.
•
Undo the 4 screws (pg. 77, Fig. 3, a ; pg. 78, Fig. 5, a) on the motor cover and
remove the motor cover.
•
In centrifuges with cooling, remove the rubber packing (pg. 78, Fig. 5, item 15)
between the motor cover and the centrifuge chamber.
•
Unscrew the speed sensor (pg. 77, Fig. 3, item 18 ; pg. 78, Fig. 5, item 18) from the
upper end plate of the motor (2 screws) and place it in the centrifuge chamber.
•
Unscrew the 3 nuts (pg. 77, Fig. 3, b ; pg. 78, Fig. 5, b) on the lower end plate of the
motor.
•
Take out the motor from the centrifuge from above.
•
Unscrew the speed sensor / imbalance sensor (pg. 77, Fig. 3, item 19 ; pg. 78,
Fig. 5, item 19) at the bottom of the motor (3 screws).
•
Before mounting the motor, check the 3 rubber-metal bearings for possible wear or
cracks and replace them if necessary.
If one rubber-metal bearing is damaged all 3 rubber-metal bearings must be
replaced.
While mounting the rubber-metal bearings, make sure that there is an anti-twist
device (pg. 77, Fig. 3, item 21 ; pg. 78, Fig. 5, item 21) on both sides of the bearing
to prevent it from turning.
•
To mount the motor, carry out these steps in opposite order.
•
After exchanging the motor or the rubber-metal bearings the imbalance switch-off
must be checked, see pg. 59, chapter 6.15.3.
10.6 Speed sensor (B4, on top of the motor)
•
Remove the front panel and the support sheet for electronics (A1) as described in
chapters 10.1, 10.2, pg. 80.
•
Pull the plug S602 on the electronics (A1), see pg. 93, chapter 11.3.
•
Dismount the rotor.
•
Undo the 4 screws (pg. 77, Fig. 3, a ; pg. 78, Fig. 5, a) on the motor cover and
remove the motor cover.
•
In centrifuges with cooling, remove the rubber packing (pg. 78, Fig. 5, item 15)
between the motor cover and the centrifuge chamber.
•
Remove the fixation of the speed sensor cable.
•
Unscrew the speed sensor (pg. 77, Fig. 3, item 18 ; pg. 78, Fig. 5, item 18) from the
upper end plate of the motor (2 screws).
•
To mount the speed sensor, carry out these steps in opposite order.
Summary of Contents for ROTINA 420
Page 1: ...06 08 Andreas Hettich GmbH Co KG AR4701EN ROTINA 420 ROTINA 420 R Repair instructions ...
Page 78: ...77 97 Fig 2 Fig 3 3 1 5 4 6 7 a b d 13 16 18 17 19 21 22 30 25 23 38 21 20 b a c d ...
Page 80: ...79 97 Fig 6 Fig 7 Fig 8 9 10 12 11 7 8 a b 29 28 27 26 41 43 44 41 39 42 40 42 45 a c b d d ...
Page 95: ...94 97 11 3 2 Connecting diagram ROTINA 420 420 R ...
Page 96: ...95 97 ...
Page 97: ...96 97 ...
