【求助】英语求助:K2001-4

Too get rid of such situation, you should enter a new (lower) threshold value. To enter a new value just use the numerical keys on the keypad followed by enter key (E key). The value must be between 0 and 16,777,215 counts. The default value is normally just what the system needs and under normal conditions this value should not be changed.
要摆脱这种情况，你可以输入一个新的（较低）的界定值。要输入一个新值，你只需要使用键盘盘上的数字键，然后按E键确认。该值必须在0~16，777，215之间。该默认值通常应满足系统需要，且正常条件下不要改变。

If (......, and......) then what?
Is there anything missing? Or "and" is a redundant?

这是手册原文，自译以来，缺失和错写已经很正常，按自己意思译就可以，这也是我求助的原意之一。