Harrington Hoists and Cranes NER2 Smart Limits Supplement - Manual (Page 6)

3.0 Preoperational Procedures
3.8 Activation
3.8.1

Ensure that the voltage of the electric power supply is proper for the hoist.
3.8.2 In order to activate the Smart Limit option, turn the piano switch on the micro-computer assembly to ON
as shown in Figure 3-10.
Figure 3-10 Piano Switch on the Micro-Computer Assembly
3.8.3

Do not put a load on the hoist when registering the length of load chain.
3.8.4 The length of load chain must be registered before the Smart Limits is activated. The hoist will only
operate in low speed before the length of load chain is registered. The registration procedure is as
follow:
• Turn the hoist on and open up the controller cover.
• Locate the DIP switches on the interface board shown in figure 3-11. Turn switch number 8 on
(flip up). Do not change the positions of switches 1 through 7.
• With switch number 8 on, operate the hoist in the up direction until the upper limit switch
actuates.
• Operate the hoist in the down direction until the lower limit switch actuates.
• After reaching both upper and lower limits, turn switch number 8 off (flip down).
With the length of load chain registered with the unit, the hoist will operate in high speed. The
registration will also enable the soft stop feature. The soft stop feature allows the hoist to automatically
switch to low speed near its limits (upper/lower ultimate limits and upper/lower set limits).
Figure 3-11 Piano Switch on the Micro-Computer Assembly
3.8.5

Be sure to register the length of load chain every time the hook or the chain has
been replaced.
Turn DIP switch 8 ON.
(Flip up.)
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