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0 operation – Harrington Hoists and Cranes NER2 Smart Limits Supplement User Manual

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4.0 Operation

4.4

Setting and Canceling the Smart Limit

4.4.1



Register the length of load chain before setting or canceling the Smart Limit.

4.4.2

Smart limit is adjustable from the pendant for both upper and lower limits. The setting/canceling
procedure for the Smart Limit is as follow:

• Stop hook at the desired limit position.
• Press the Emergency Stop Button.
• To set the limit:

o

For upper limit, depress the UP button to low speed for 5+ seconds.

o

For lower limit, depress the DOWN button to low speed for 5+ seconds.

• To cancel the limit:

o

For upper limit, depress the UP button to high speed for 5+ seconds.

o

For lower limit, depress the DOWN button to high speed for 5+ seconds.

• Turn the Emergency Stop Button clockwise to allow hoist operation.

4.5

Calibration of the Smart Limit

4.5.1



To avoid a potentially harzardous situation, peform a calibration of Smart Limit after

a loss of power.

4.5.2



Do not put a load on the hoist when calibrating Smart Limit.

4.5.3

In case of a power loss, the set positions of Smart Limit may change. The hoist will only operate in low
speed until it is calibrated. The calibration procedure is as follow:

• Press the Emergency Stop Button.

• Depress the UP button to the high speed for 5+ seconds.

• Turn the Emergency Stop Button clockwise to allow hoist operation.

• Operate the hoist in the UP direction until the upper limit is actuated.

• With the upper limit switch actuated, press the Emergency Stop Button.

• Depress the UP button to the low speed for 5+ seconds.

• Turn the Emergency Stop Button clockwise to allow hoist operation.

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