DSAI133A 数字处理模拟量输入模块 确保系统正常运行

DSAI133A 数字处理模拟量输入模块 确保系统正常运行

DSAI133A 3BSE018290R1 VFD起动频率设定方法

(1)恒转矩负载。一般起动时电机的同步转速不应超过额定转差率。即:

其中P是电机的极数；△n——额定滑差，△n = n1-ne；N1-同步速度；ne-额定速度；(1)方形扭矩载荷。由于方波转矩负载在低速时阻力矩小，所以可以适当提高起动频率。

在实际应用中，应合理设置启动频率，以解决电机启动困难和过流跳闸的问题。对于启动转矩较大的电机，首先要考虑设置合适的启动频率参数，然后根据实际负载情况设置合理的转矩提升曲线。如果起动时VFD电流过高，甚至出现过流跳闸，可以通过延长加速时间来解决。但一般来说，只要不出现流量过大的情况，提速时间尽量短，以提高效率。 

DSAI133A 数字处理模拟量输入模块 确保系统正常运行

DSAI133A 3BSE018290R1 VFD starting frequency setting method

(1) Constant torque load. Generally, the synchronous speed of the motor should not exceed the rated slip rate. To wit:

Where P is the number of poles of the motor; △n -- rated slip, △n = n1-ne; N1- synchronization speed; ne- rated speed; (1) Square torque load. Since the square wave torque load has a small resistance moment at low speed, the starting frequency can be appropriately increased.

In practical application, the starting frequency should be set reasonably to solve the problem of motor starting difficulty and overcurrent tripping. For the motor with large starting torque, it is necessary to first consider setting the appropriate starting frequency parameters, and then set a reasonable torque lifting curve according to the actual load. If the VFD current is too high when starting, or even overcurrent tripping, it can be solved by extending the acceleration time. But in general, as long as there is no excessive flow, the speed up time is as short as possible to improve efficiency.