タイトルまたは説明

                                 NA***7 User Guide Main Function and Control Logic: The temperature testing has two channels: one is at the water inlet, as the temperature controlling signal,the other is at the water outlet, used for preventing frostbite. Four output channels: compressor, cooling water pump, freezing water pump, alarm output. Three switching value s (passive point signal): cooling water pressure switch, freezing water pressure switch, on-off signal. Control Logic: 1. On/off The controller can start up or shut down with the on-off key on the panel or external switch, the light of the "power supply" lights in the on state and extinguishes in the off state. 2. Refrigeration When it begins to refrigerate, the controller will first turn on the cooling water pump, and then turn on the compressor when the cooling water pump switch is close. When it stops refrigeration, the controller will shut off the compressor and cooling water pump. The freezing water pump is always running in the on state. 3. Water lack alarm Check whether the cooling water and the freezing water is normal by water pressure switch, if the freezing water is lacking in the on state, the controller will turn off the freezing water pump and give an alarm and can not turn on refrigeration. If the freezing water or cooling water is lacking in the refrigerating state, the system will stop and give an alarm. 4. Frostbite preventing If the water out temperature of the freezing water is below3C, the controller will stop refrigeration, but the freezing water pump is still running, the state will resume when the temperature goes up to 5C. (The alarm temperature and the resume temperature are adjustable, and please refer to the senior operation) Technique Index: Temperature display range:**0~**5C, step 0.1C Temperature setting range: **5~**0C Power supply: *2V AC (Use the transformer with the controller,primary voltage, **0V±*0% or **0V±*0%) Operation Environment: temperature **0C~*5C, humidity≤*5%. Without congealed hoarfrost. Relay contact capability: 2A/*50VAC (Pure resistive load) Temperature sensor: NTC R*5=5kΩ, B (*5/*0) =***0K Executive standard: Q/*****5 XYK *1 (NA***7-CTAX)