Engineers and technicians should be completed in a few centrifuges to the special safeguard
a. Vacuum .centrifuge-kaida.com">centrifuge system maintenance
Under normal circumstances, the vacuum centrifuge table in the direction of the indicator should be marked green. When the centrifugal chamber door, set the timer after a minute, vacuum table should be able to meet the normal work of the vacuum value and stability. If the centrifugal chamber of the vacuum shortage, it should first check the centrifugal chamber of the ring on the surface whether there is filth, followed by the check-in vacuum filtration bottle is tightened up.
b. The belt replacement
If from t2 "after the completion of the operation of the machine .centrifuge-kaida.com">centrifuge door of the room can not open or operate in the process of sudden acceleration more than Electrical abnormal phenomenon often, the centrifuges could be cut off the belt. If the regular check-ups, they may be driving belt Zhan loss to a certain extent when its replacement will be. Belt should pay attention to the replacement of the belt and accurately into the v-bed, the belt has a tooth pattern of outward. Belt by the motor locking spring tension, replacement Would be appropriate only when the motor, according to North Korea, can be stretched spring, which will release belts removed. With the new equipment should be let go after a good opening up gradually, to avoid vibration. Loaded after turning clockwise laps To see whether there has been a kink belt.
c. brush motor replacement
As the centrifuge is used in high-torque DC motor, brush wear and tear easily after a serious fire ring, it is easy to burn for electrical appliances, so when the centrifuge control panel warning light on the BRUSH-liang, it is necessary in a timely manner Brush replacement. When the bright lights, but also the normal operation of centrifuges 8 hours, so if the lights when they are in operation, and so on can be replaced before the end of the operation. Brush replacement should be replaced in pairs, the cable is about to brush and brush along with unlimited change. The best use of the new Al-Qaeda on the parts. Brush a new test after the operation period of time to hear to make the brush and commutator between a good bite, the general should be based on the speed of 15000RPM operation 8h, at least more than 30min.
d. Operating speed of the correction
(1) of the tachometer correction
Tachometer (ROTOR SPEED) mechanical correction of zero: the power to open, adjust the speed of a black hole at the bottom of the table screw, so that just Biaozhen means to zero. When adjusted gently tap table cover, so that the back-pointer with ease. Tachometer accuracy of the correction: the speed control circuit board RUN-CAL switch back to the CAL, in a state of correction. At this point is the tachometer and power come from the 50Hz signal then together, the correction circuit of 50Hz AC signal into a 100-per-second pulse of the pulse signal to replace the electrical signal to the speed of the tachometer. Corresponding to each of the pulse, said centrifugal fan rotation lap, 100 pulses per second on the speed for that 100r / s (RPS), as a result of motor speed and turn of speed ratio is between 2.1 and therefore the state of calibration Under the direction of the tachometer value should be: 100 x 2.1RPS = 210RPS = 12600RPM tachometer if the value is not indicative 12600RPM, can tap the bottom of the table panel, if still inaccurate. The circuit-board adjustment should be marked as the TACH potentiometer R103, clockwise to increase transfer, counter-clockwise to lower the transfer.
(2) to control the speed of correction
The board will RUN-CAL Switch to draw RUN, respectively 1000RPM choice and value for the speed of the two 20000RPM rate of correction. School was taking 1000RPM and the speed of the two 20000RPM value, Beckman is recommended.
Low-speed correction:
SPEEl3 knob to set the 1000RPM, will be set up in the TIME knob HOLD, do not close the .centrifuge-kaida.com">centrifuge equipment turned the room door and start running, running stability, tachometer instructions in the value of 1000 ± 200RPM, if we do not In line with, the adjustment circuit board marked the LOSP potentiometer R102.
High-speed correction:
SPEED will set the knob in the 15000RPM, such as speed and stability, and then slowly to SPEED knob to 2o0o0RPM (Note: adjust to the slow rate of increase too quickly will lead to a speeding-controlled onwards protection system. Will stop running), speed, etc. Stability, the tachometer to see whether the instructions in the 20000 ± 200RPM control. If not, then adjust the circuit board marked the HISP potentiometer R10t.
Repeat adjustments:
Repeat the above two-step adjustment, until in the low-speed and high-speed 1000RPM of 20000RPM, tachometer readings are in error of ± 200RPM.
Hunan Kaida scientific instruments Co., Ltd.
Tel :0731-5150921 5811540
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