The NCT252 device is a weighing device which, when connected to a load cell, allows you to view the weight lifted by any crane or bridge crane on a 4 1/2 digit LCD display.
Inside there are five relays that can be programmed independently of each other to open their normally closed contact when the weight lifted exceeds the limit set using the corresponding trimmer. The contacts of these relays can therefore be used to exclude one after the other, depending on the load, up to five lifting speeds in order to perfectly comply with the data shown in the crane booklet, which is difficult to achieve with traditional mechanical limiters.
The circuit works with an “open contacts in case of danger” logic, therefore, to allow regular operation of all lifting speeds it is necessary that:
The NCT252 is regularly powered with a voltage of 48 VAC.
The load cell is regularly connected without any interruption.
The weight lifted does not exceed the thresholds set on each trimmer. In all other cases the relay contacts are open, and the various lifting speeds disabled.
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