Modular water chilling unit control method

Abstract

The invention relates to a method for controlling a module-typed water chiller. The invention discloses a method which can quickly determine the quantity of the outdoor machines and can carry out the control according to the quantity of the outdoor machines. The method comprises the steps as follows: a. an integrated controller sends an address code to the outdoor machine; b. after the outdoor machine receives the address code which is the same to the self-address of the outdoor machine, the outdoor machine feeds back a reply signal to the integrated controller; c. after the integrated controller completes sending the address code, the quantity N1 of all reply signals is counted; d. the step a is turned back to; after the address code is sent for the second time, the quantity N2 of all reply signals is counted; e. whether N1 is equal to N2 is judged, if so, the step f is executed and if not, the step a is executed; f. the quantity of the current outdoor machines is determined as N1; subsequently, before being powered down, the integrated controller only sends the address to N1 when communicating with the outdoor machines. The method automatically detects the quantity of the outdoor machines, reduces the unnecessary malfunction, improves the stability of the system and is suitable for the control system of the central air conditioner.

Description

technical field [0001] The invention relates to a central air-conditioning control system, in particular to a control method for a modular chiller. Background technique [0002] In the central air-conditioning system, the modular chiller includes a centralized controller and an outdoor unit that controls the compressor. During the control process, the centralized controller is used as the master address, and the outdoor unit is used as the slave address. Send a control command to the outdoor unit, and when the outdoor unit receives the same code as its own address, it exchanges data with the centralized controller. In the prior art, the centralized controller controls the outdoor units by a single-chip microcomputer, and the maximum number M of outdoor units it can control is fixed, so the sending address of the centralized controller is continuous from 1 to M change, and the number N of outdoor units (the maximum cannot exceed M) may change. Since the number of N cannot be...

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Problems solved by technology

In the prior art, the centralized controller controls the outdoor units by a single-chip microcomputer, and the maximum number M of outdoor units it can control is fixed, so the sending address of the centralized controller is continuous from 1 to M change, and the number N of outdoor units (the maximum cannot exceed M) may change. Since the number of N cannot be determined in real time, the maximum number control is generally adopted, that is, the centralized controller must send M addresses to the outdoor units each time. To carry out data communication with N outdoor units, this will cause M-N communication failures that should not have occurred, and the data exchange time is slow, which affects the control of the outdoor unit by the centralized controller

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