Eaton Cooper Power NR Series Maintenance Instructions Manual

Contents

Selector and holding switchesTo replace the selector switch, or holding switch if soequipped, proceed as follows:1. Heat the solder joint at the common terminal of theselector switch to disconnect black lead (Figure 12).Use a gun rated no higher than 100 watts and use only50-50 or 40-60 rosin core solder for repair work.2. Disconnect leads from terminal strip: red and blackfrom terminals 2 and 3 for selector switch, green fromterminal 1 for holding switch.3. Remove two round head screws with lockwashers thatsecure the switch to the support bracket. Mountingspacers and a nut bracket (on underside of support) willalso be released.4. Attach new switch to support bracket, securing itloosely with two round head screws so that it is free tomove for adjustment.5. Connect wire lead(s) to terminal strip. Solder blacklead(s) to common terminal of selector switch.6. Operate cam electrically and adjust selector switch socontact actuation takes place relatively early on camlobe, and that an over-travel (movement of operator armafter contact actuates) of approximately 3/64-inch isachieved.7. Check that main contacts open before the selectorswitch actuates. Main contact and selector switch areproperly coordinated when an audible click is heard,from within the tank, before selector switch contactactuates.8. Adjust holding switch (if so equipped) so actuationtakes place after selector switch actuation and operatorarm over-travel is observed. A definite time lag betweenthe actuation of the selector switch and holding switchmust be observed.ote:N It may be necessary to readjust selector switch toobtain proper sequence and over-travel.9. When selector switch and holding switch (if soequipped) are properly adjusted, tighten screws tosecure switch(es) to support bracket. Run actuatorthrough 25 opening and closing operations to be sureswitch adjustments hold.Figure 14. Adjustment procedure for selector (maincontacts and spring relaxed).Selector SwitchContact andOver-travel CamCamSelector Switch10TYPE NR OIL SWITCH MAINTENANCE INSTRUCTIONS MN230001EN February 2016