Du Pont SORVALL RC-5 Service Manual page 137

Note:
The ROTOR CODE switches
must be set for the rotor that is in
use.
P/N: 50589-3
INSTRUCTIONS
RC-5B / RC-5C Preventative Maintenance Kit
(Kit Catalog No. 12010)
b. While the rotor accelerates, measure the motor current draw on the
ammeter.
c. Verify that the maximum motor current draw on acceleration is
16.5 ± 0.5 amps. If necessary, calibrate the motor current limit.
d. Verify that the rotor attains the preset maximum run speed ±1%. If
necessary calibrate the top speed.
10. Verify that the compressor cycles at 4°C. If the compressor does not
cycle at 4°C, check for the following conditions:
Ambient temperature above 25°C.
Low refrigerant charge.
Faulty start or run capacitor.
Air leak in door or gyro seals.
Air blockage at condenser coils.
Condenser fan non-functional.
If necessary, refer to Troubleshooting for Refrigeration System.
11. Check the accumulated run time.
a. Refer to the time recorded in step 6. h. and calculate the accumu-
lated run time.
b. Verify that the accumulated run time that is displayed equals the
calculated run time in step 12.a.
12. Check the RCF indicator and value.
a. Press the RCF switch.
b. Verify that the RCF indicator lights (green).
c. Verify that the value shown in the SPEED RPM RCF display is the
correct RCF value for the rotor in use.
13. Check the centrifuge braking time.
a. Press the STOP switch. Record the braking time: the time from
when the STOP switch is pressed until the SPEED display shows
zero rpm.
b. Verify that the braking time is within the specified value range for
the rotor and speed in use: (see rotor speed chart)
for the
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