Fan master control signal system

Abstract

The invention relates to a fan master control signal system. The fan master control signal system comprises a plurality of digital output modules, a second power supply module, a first power supply module and a plurality of digital input modules, wherein the first power supply module and the digital input modules are electrically connected in sequence, and the second power supply module is electrically connected with the digital output modules. Compared with the prior art, the power supply distance is shortened, the problem of voltage drop or instability caused by the digital input modules andelectrical interference caused by the overlong power supply distance are eliminated, and therefore a gearbox oil pump motor protection fault and a safety chain disconnection fault are not reported any more.

Description

technical field [0001] The invention relates to the field of fan control, in particular to a fan master control signal system. Background technique [0002] Due to the long operating life of the fan unit, the fan often reports a protection fault of the gearbox oil pump motor, and sometimes reports a safety chain disconnection fault at the same time. Go to the tower to check that the three-phase internal resistance of the oil pump motor is similar, and the motor has no mechanical jams. Odor or burning phenomenon. At the same time, there is no abnormality in the phase-to-phase and single-phase tests of the motor circuit, and the contactor operates normally. Therefore, it is ruled out that the motor itself is faulty or the circuit is short-circuited or the contactor does not operate in place. It is suspected that there is a gap between the main control system modules. Poor contact leads to unstable voltage of the digital output module (DO module). Although the module has a cert...

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Problems solved by technology

[0002] Due to the long operating life of the fan unit, the fan often reports a gearbox oil pump motor protection fault, and sometimes reports a safety chain disconnection fault at the same time. Go to the tower to check that the three-phase internal resistance of the oil pump motor is similar, and the motor has no mechanical jams. Odor or burning phenomenon. At the same time, there is no abnormality in the phase-to-phase and single-phase tests of the motor circuit, and the contactor operates normally. Therefore, it is ruled out that there is a problem with the motor itself or the circuit is short-circuited or the contactor is not in place. It is suspected that there is a gap between the main control system modules. The voltage of the digital output module (DO module) is unstable due to loose contact. Although it has a certain effect after plugging and unplugging the module, the fan will often report a motor protection failure of the oil pump motor.

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