Sorvall TC6, Service Manual, Page: 97 / 109

TC6 ® Maintenance
7-5
d. Electronic Checks
1. Set the POWER switch to " l ".
2. Press the
DOOR
switch to open the chamber door. Install
the H-400 Rotor with four full buckets onto the drive spindle.
3. Set the run parameters: SPEED dial and TIME dial, to the
desired settings for a normal run application.
4. Press the START switch.
5. Use a stopwatch to check the acceleration time. The time
verified should be less than 45 seconds to 3500 rpm with full
load. Accurate test results can be achieved with 100 ml of
water in each of the four buckets.
6. When the rotor has reached the preset rpm value, verify the
rpm reading using a strobe tachometer following the
instructions supplied with the tachometer. Check the rotor
through the viewing port located in the center of the chamber
door. If verifying with a frequency meter, attach leads to test
points labelled TACH on Control Printed Circuit Board.
(Frequency recorded should be multiplied by five). The
reading given by the tachometer or frequency meter should
be in agreement with the
SPEED display to within
±
1%␣of
the set run speed.
7. Use a stopwatch to check the deceleration time. The time
verified should be less than 40 seconds from 3500 rpm with
full load.
8. Press the START switch. Using a stopwatch, verify that the
centrifuge turns off when the preset time has elapsed (
±
␣3␣sec-
onds).
e. Motor System
1. Motor Bearings
Remove rotor and spin shaft by hand. If the motor bearings
are noisy or rough, replace motor.
2. Motor Plate Bushings
Check motor mounting plate for uniform stiffness. Replace
bushings if necessary.
7-5/7-6