Hired-Hand PowerTrak Jr - Manual (Page 9)

Part No. 4801-0172 Rev 10/05 PowerTrak Jr. Page 9 of 18
8. Cabling Options
8.1 General Description
Cabling will vary depending on your application. All cable segments to vents or curtains
should be installed before connecting PowerTrak Jr. The following examples show how
to set up some typical cabling schemes. In this manual, 'open' refers to open vents or
raised curtains. 'Closed' refers to closed vents or lowered curtains. In these examples,
the open position corresponds to the upper limit setting of the machine. The closed
position corresponds to the lower limit setting of the machine. Upper and lower limit
settings are described in the section "Limit Switches".
Sheaves (pulleys) are recommended for installation of cabling. Some typical examples
are shown in Section "Cabling examples". Construct cabling as required for your
particular application. Be careful not to overload the machine.
8.2 Cabling Examples
PowerTrak Jr. operates with highest efficiency if cabling is connected straight to unit
without bending cables. Such a set up is shown in Figure 3 where a machine is mounted
horizontally and connected to a row of vents. The mechanical advantage of the cabling
in Figure 3 set up is 1 to 1/2. Figures 4 and 5 show alternative cabling schemes.
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Figure 3
Mechanical advantage 1 to 1/2
Important!
Make Sure That The Load On Machine Is Within The Specified Ratings.