112 lines
3.9 KiB
Python
112 lines
3.9 KiB
Python
# hardware/inverter.py
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from math import e
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import minimalmodbus
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import time
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from serial import SerialException
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class InverterController:
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def __init__(self,port='/dev/ttyUSB0'):
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self.inverter=None
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self.port=port
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def _connect(self)->bool:
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"""连接变频器"""
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try:
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self.inverter = minimalmodbus.Instrument(self.port, 1)
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# 2. 配置串口参数
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self.inverter.serial.baudrate = 9600 # 波特率
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self.inverter.serial.bytesize = 8 # 数据位
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self.inverter.serial.parity = 'N' # 无校验
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self.inverter.serial.stopbits = 1 # 停止位
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self.inverter.serial.timeout = 1.0 # 超时时间
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self.inverter.mode = minimalmodbus.MODE_RTU # RTU模式
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return True
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except SerialException as e:
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print(f"串口占用或无法连接变频器串口:{e}")
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return False
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except Exception as e:
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print(f"连接变频器异常:{e}")
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return False
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def set_frequency(self, frequency):
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"""设置变频器频率"""
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_ret=False
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try:
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if(self._connect()):
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frequency_value = int(frequency * 100)
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self.inverter.write_register(0x7310, frequency_value)
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_ret=True
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else:
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print(f'设置频率{frequency}失败')
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except Exception as e:
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print(f"设置频率{frequency}异常:{e}")
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finally:
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if self.inverter:
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self.inverter.serial.close()
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return _ret
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def read_frequency(self):
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"""读取变频器频率"""
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_ret=None
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try:
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if(self._connect()):
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frequency_value = self.inverter.read_register(0x7310)
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_ret=frequency_value / 100
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else:
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print(f"读取频率失败")
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except Exception as e:
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print(f"读取频率异常:{e}")
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finally:
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if self.inverter:
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self.inverter.serial.close()
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return _ret
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def read_status(self):
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"""读取变频器启动状态"""
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_ret=None
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try:
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if(self._connect()):
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status_value = self.inverter.read_register(0x3000)
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_ret=status_value
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else:
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print(f"读取启动状态失败")
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except Exception as e:
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print(f"读取启动状态异常:{e}")
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finally:
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if self.inverter:
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self.inverter.serial.close()
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return _ret
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def control(self, action,frequency=230):
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"""控制变频器启停"""
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if action not in ['start', 'stop']:
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print(f"无效操作: {action}")
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return False
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_ret=False
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# 先检查动作是否有
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try:
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if(self._connect()):
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if action == 'start':
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status_value = self.inverter.read_register(0x3000)
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##读取3000H可直接读取变频器的当前状态（0001：正转运行；0002：反转运行；0003：停机；0004：电机参数辨识；0005：故障）。
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if status_value==3:
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frequency_value = int(frequency * 100)
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self.inverter.write_register(0x7310, frequency_value)
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time.sleep(1)
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self.inverter.write_register(0x2000, 1) # 1=正转运行
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print("启动变频器")
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elif action == 'stop':
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self.inverter.write_register(0x2000, 6) # 6=减速停机,5自由停机
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print("停止变频器")
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_ret=True
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else:
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print("连接变频器失败")
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except Exception as e:
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print(f"变频器控制错误: {e}")
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finally:
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if self.inverter:
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self.inverter.serial.close()
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return _ret
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