Troubleshooting methods for laboratory centrifuges that fail to rotate or fail to reach the set speed.

Release time:

2014-02-24

Overview:

There are three possible causes: (1) A fault in the power circuit section; (2) A fault in the motor itself; (3) A fault in the speed control section.

There are three possible reasons why the centrifuge fails to rotate or cannot reach the set speed:

(1) Failure in the power supply circuit. First, inspect and repair easily damaged components such as the power cord, outlet, plug, rheostat (WH118, 3.3 kΩ, 2 W), and relays (HH52P, HH53P). Then, proceed to check the circuits following the switching power supply—specifically, the circuit breaker, rectifier, filter, and transformer (OUT18V, 3 A)—all the way up to the motor section.

(2) Motor failure itself. The motor is one of the key components of the centrifuge. Motors are classified into brushed motors and brushless motors. This centrifuge uses a brushed motor; nowadays, most motors are brushless. If the motor fails to reach the set speed, first check the bearings. Replace them if necessary, and perform maintenance when required (such as adding lubricant or cleaning). Next, inspect whether the motor’s commutator and brushes are properly matched, whether the brushes are severely worn, and whether they need to be replaced.

(3) Failure in the speed control section. The speed control system features an integrated chip (CW7815C III9501) that ensures the centrifuge operates safely and accurately. If the speed failure cannot be resolved by addressing the causes mentioned above, you can replace either the chip or the control panel.

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