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Your Location: Home >> News >> Technical support >> How to avoid the occurrence of freeze dryer failure?

How to avoid the occurrence of freeze dryer failure?

Release Date: 2020/8/7 14:00:09 .
Browse: 322

  Nowadays, the production of many freeze-dried products requires the use of freeze dryers. Reasonably and effectively shortening the freeze-drying cycle has obvious economic value in industrial production. Freeze-dried items are easy to store for a long time, and can be restored to the state before freeze-drying after adding water and maintain the original biochemical properties. In order to make the pharmaceutical freeze dryer develop in a direction that is more conducive to product production, and while ensuring product quality, it can improve production efficiency, reduce resource waste and facilitate production operations. But sometimes we consumers inevitably have some failures when using it. We need to analyze specific problems in detail:
  1. the dryer does not run
  The compressor circuit is disconnected, the fuse is blown, the thermal relay is activated, the high-voltage switch is activated, the compressor is blocked, and the circuit is virtual or loose.
  2. Drying stops within a short time after starting
  The ambient temperature is too high, the condenser is blocked, the compressor is overloaded, the lack of refrigerant, the low pressure is too low, the air intake is too large, and the compressor is stuck.
  3.the compressor does not start
  The wiring is incorrect, the voltage is too low, the starting capacitor is damaged, the relay or contactor is not closed, the starting winding is open, and the phase is missing.
  4. The compressor is repeatedly started and stopped due to overload protection, low voltage or three-phase unbalance, other electrical equipment is connected to the overload protector, the overload protector fails, the running electric heater is too small, the exhaust pressure is too high, and the windings are short-circuited , The thermal relay contacts are stuck firmly.
  5. The relay burns out
  The voltage is too high or too low. The running capacitor is not correct, repeated start and stop, the relay specifications do not match, and the mounting seat is incorrect.
  6.the capacitor burns out
  The specifications do not match, and the voltage is too high.
  7.exhaust pressure is too high
  The amount of refrigerant is too much, there is air in the refrigeration system, the condenser is dirty, the ambient temperature is too high, the fan pressure switch is faulty, the fan motor is faulty, the fan rotation direction is incorrect, and the cooling water flow control valve is faulty.
  8. Exhaust pressure is too low
  The amount of refrigerant is too small, and the fan pressure switch is malfunctioning.

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