The cold storage can be turned on manually, and it can not be used automatically, what is the proble

The cold storage can be turned on manually, but it cannot be used automatically. This problem is that there is a problem with the temperature control part of the electric cabinet, the electric control cabinet of the cold storage is also the temperature control cabinet, which is usually made into two control modes: manual and automatic. Automatic control is to rely on the micro relay contact inside the thermostat to control the AC contactor electromagnetic coil power supply, the failure of the landlord said, proves that there is a problem with the output of the thermostat, of course, it is not excluded that the thermostat is set unreasonably, the thermostat should be checked, and whether the refrigeration output relay has an output!!

Hello. According to the analysis of the phenomenon, your cold storage, semi-enclosed 3hp domestic copeland unit should be no big problem, the problem lies in the abnormal refrigeration system, the high and low voltage protection relay action of the control circuit, if there is a pressure gauge.

It should be intuitive to see if the fault shutdown is caused by high or low pressure. The compressor is synchronized with the cooler fan in the cold store, so you will notice that the fan in the cold room stops at this time. If there is no refrigeration due to the failure and shutdown, the temperature in the warehouse will of course rise.

Why does the compressor "squeak" after a small "jump" sound during operation--- squeak" sound is the phenomenon that the high-pressure end in the compressor shutdown is slightly relieved from the low-pressure end through the valve plate and piston. If it is caused by low pressure, it can only be ice blockage (dirty blockage cannot heal itself if it is not treated), and it can be solved by replacing the filter drier. Shutdown caused by high pressure is related to poor heat dissipation, and it is recommended to check whether the cooling conditions have deteriorated and improve it.

The cold storage is manual and automatic, and the power is turned off before it starts.

Hello pro The cold storage compressor does not start, and most of the motor and electrical control failures During maintenance, it is necessary to check all kinds of electrical control components, as well as the power supply and connection lines. Compressor power line fault fault analysis: the compressor does not start, generally find from the power supply line first, such as the power fuse is blown or the wiring is loose, the line is broken and the phase is missing, or the power supply voltage is too low and other troubleshooting methods:

When the power supply is out of phase, the motor emits a "hum" AC sound without starting the thermal relay action for a slightly longer period of time, and the contacts jump open. You can use the multimeter AC voltage block to check whether the fuse is blown or measure the image voltage, if the fuse is blown, replace the appropriate capacity fuse. Motor burnout or turn-to-turn short circuit fault analysis:

When the motor winding is burned or the turn is short-circuited, the fuse is often repeatedly blown out, especially when the upper knife switch is pushed, and for the open compressor, the smell of burnt enameled wire from the motor can be smelled at this time. Exclusion method: check whether the motor binding post and the shell are short-circuited with a multimeter, and measure the resistance value of each dusty wheel phase, if it is a short circuit or a phase resistance is small, it means that the winding is short-circuited between turns, and the insulation is burned.

If the resistance is close to the trace fiber zero, it means that the insulation layer has been broken down If the motor is burned, the motor can be replaced. Temperature controller failure fault analysis: The refrigerant leakage in the thermostat's temperature sensing package or the thermostat malfunction, causing the contacts to be normally open.

Exclusion method: turn the thermostat knob to see whether it can start the compressor in the * temperature block (number * or strong cold continuous operation gear), if it cannot start, further observe whether the refrigerant in the temperature sensor package leaks, whether the contact action is out of order, etc., the slight can be repaired, and the serious one should be replaced with a new thermostat of the same model and specification. Pressure Controller Failure Failure Analysis:

When the pressure value of the pressure controller is improperly adjusted or the spring and other parts in the pressure controller fail, the pressure controller will operate, the normally closed contact will be disconnected, and the compressor will not be able to start within the normal pressure range. Exclusion method: The lid of the box can be removed to see if the contacts can be attached, and the multimeter can also be used to test whether it is on.

If the pressure is normal and the pressure controller jumps away, the high and low pressure control range of the pressure controller should be readjusted or the pressure controller should be replaced. AC contactor or intermediate relay fault analysis: Generally, the contact is prone to overheating, burning, wear and other phenomena, so that the contact contact is poor.

Exclusion method: Remove for repair or replacement. Thermal Relay Failure Failure Analysis:

The thermal relay contact jumps open or the heating resistance wire is blown out. Exclusion method: When the thermal relay contact jumps open, first check whether the setting current is suitable for the pie, and press the manual reset button, if the compressor does not jump away after starting, the cause of the overcurrent should be found out, and the reset button can be pressed again after repair.

When the heating resistance wire is burned out, the thermal relay should be replaced.

Summary. The lack of power will definitely not start.

Hello, I'm glad to answer your questions, I think the main reason why the cold storage unit can operate normally manually, but can not automatically start the hail action normally should be the failure of the control cover sail system, including the temperature control system, such as the displacement of the temperature probe or the sensitivity is not enough to change the beam, and so on. There is also a need to check whether the starting current of the compressor unit is normal.

If the current is not enough, it can cause the automatic not to start, right?

Yes. The lack of power will definitely not start.

There is no way to solve it.

The motor must be checked.

Look at the magnitude of the current.

The staff suspected that the current was low.

Then you can only replace the motor.

If it's really low current, how can I fix it.

Hold on. Replace the motor.

Is it okay to use a voltage regulator?

You can try. It usually doesn't work.

If the temperature control box of my power supply 220 is 380 electricity, will it affect the staff if the power is changed from 380 to 220 electricity?

There will be no impact.