GE DS3800NGDC1B1A电路板
•欠频延迟：如果欠频降至或低于该设置点中编程的时间延迟的欠频水平值，则会出现欠频情况。•频率=0 Hz时欠频：在测量频率之前，AN（AB）相电压输入需要大于20 V的电压。如果未施加电压或施加的电压小于20 V，则显示的频率将为0 Hz。如果在此设置点中选择“否”，则当显示的频率为0 Hz时，不会出现欠频情况。过频继电器：可禁用过频检测，用作报警或过程控制。如果不需要此功能，则将此设置点设置为关闭。选择报警继电器将使报警继电器激活，并在出现过频情况时显示报警信息。选择辅助继电器将导致辅助继电器在过频情况下激活，但不会显示任何信息。这用于过程控制。
• UNDERFREQUENCY DELAY: If the underfrequency drops to or below the UNDERFREQUENCY LEVEL value for the time delay programmed in this setpoint, an underfrequency condition will occur. • UNDERFREQUENCY WHEN FREQ = 0 Hz: A voltage greater than 20 V is required on phase AN (AB) voltage input before frequency can be measured. If no voltage is applied or if the voltage applied is less than 20 V, the displayed frequency will be 0 Hz. If “No” is selected in this setpoint, an underfrequency condition will not occur when the displayed frequency is 0 Hz.OVERFREQUENCY RELAY: Overfrequency detection can either be disabled, used as an alarm or as a process control. Set this setpoint to off if the feature is not required. Selecting alarm relay will cause the alarm relay to activate and display an alarm message whenever an overfrequency condition exists. Selecting auxiliary relay will cause the auxiliary relay to activate for an overfrequency condition, but no message will be displayed. This is intended for process control.
