Table of Contents
Advertisement
Selector and holding switches
To replace the selector switch, or holding switch if so
equipped, proceed as follows:
1.
Heat the solder joint at the common terminal of the
selector switch to disconnect black lead (Figure 12).
Use a gun rated no higher than 100 watts and use only
50-50 or 40-60 rosin core solder for repair work.
2.
Disconnect leads from terminal strip: red and black
from terminals 2 and 3 for selector switch, green from
terminal 1 for holding switch.
3.
Remove two round head screws with lockwashers that
secure the switch to the support bracket. Mounting
spacers and a nut bracket (on underside of support) will
also be released.
4.
Attach new switch to support bracket, securing it
loosely with two round head screws so that it is free to
move for adjustment.
5.
Connect wire lead(s) to terminal strip. Solder black
lead(s) to common terminal of selector switch.
6.
Operate cam electrically and adjust selector switch so
contact actuation takes place relatively early on cam
lobe, and that an over-travel (movement of operator arm
after contact actuates) of approximately 3/64-inch is
achieved.
7 .
Check that main contacts open before the selector
switch actuates. Main contact and selector switch are
properly coordinated when an audible click is heard,
from within the tank, before selector switch contact
actuates.
8.
Adjust holding switch (if so equipped) so actuation
takes place after selector switch actuation and operator
arm over-travel is observed. A definite time lag between
the actuation of the selector switch and holding switch
must be observed.
N
ote:
It may be necessary to readjust selector switch to
obtain proper sequence and over-travel.
9.
When selector switch and holding switch (if so
equipped) are properly adjusted, tighten screws to
secure switch(es) to support bracket. Run actuator
through 25 opening and closing operations to be sure
switch adjustments hold.
10
TYPE NR OIL SWITCH MAINTENANCE INSTRUCTIONS MN230001EN February 2016
Selector Switch
Contact and
Over-travel Cam
Figure 14. Adjustment procedure for selector (main
contacts and spring relaxed).
Cam
Selector Switch
Advertisement
Table of Contents
