Duff-Norton NZ-100 - Manual (Page 5)

5
prevent water entry. The exact technique
will depend on orientation and degree of
moisture. The tube vent has a hood;
however, if any water is collecting on this
vent, the high volume of air passing
through the vent can suck water into the
actuator. A street elbow can be used to
reorient the vent. Another option is to
replace the vent with a hose barb fitting
and attach several inches of vinyl tubing -
secured in a downward position. Use a
tubing large enough to avoid capillary
suction in the tube.
2-6. Wiring
Wiring of motor, brake, and/or limit switch should
be done according to the wiring diagrams supplied
with those components. Limit switches are not
internally connected and must be wired into motor
contactor control circuits. All wiring should be
according to local and national electrical codes.
Motor controls should be properly sized to provide
adequate motor overload protection. See motor
nameplate as to any internal motor protection.
Particular note should be given to the brake wiring
connections. The brake on "Nord" brand motors
can be wired directly to the motor windings
(diagram 1 from motor instructions) or wired
through an auxiliary contact on the motor contactor
(diagram 2 or 3). Use of the auxiliary contact will
provide faster brake engagement.
Three phase motors must be trial connected to
check for proper phasing relative to controls and
limit switches. Wiring connections to the
SuperCylinder must be made with flexible conduit
or cable to allow for movement of the actuator
during its operation.
2-7. Limit Switch Adjustment
Limit switches (if fitted) are not factory set and
must be adjusted to prevent jamming and damage
to the actuator and/or mating equipment. Before
setting limit switches, the installer should make
certain that the actuator has sufficient travel in both
directions to produce the range of travel required
by the installation. If there is any question about
this, the rod end clevis pin should be disconnected
and the rod rotated by hand, in each direction, to
its internal stops. The length of extended rod can
be measured in these two extremes and the
measurements used for reference while setting limit
switches.
Two types of limit switches are used. NZ and NL
models use a traveling nut switch. NU models use
a geared cam switch. Refer to the appropriate
setting instructions:
1.
2.
3.
4.
5.
6.
7.
Traveling nut adjustment (NZ, NL models):
Do not touch any internal parts
of limit switch unless power has
been disconnected.
WARNING
Remove limit switch cover.
Run actuator or rotate tube to desired
retracted position. Be careful not to jam
actuator. Turn off power.
Lift nut guide just enough to turn nuts, and
turn brass nut toward switch until the switch
clicks. Turn 3 notches farther. Drop nut guide
into notch.
Restore power. Run actuator out a little, and
run back in until the switch stops it. Do not let
tube rotate. Check the stopping point.
If more adjustment is necessary, turn off power
and adjust a few notches. Each notch is
approx. 1/16". Turning nut toward switch
makes the actuator stop sooner; turning nut
away from switch makes the actuator travel
farther.
Repeat steps 4 and 5 until desired setting is
obtained.
Run actuator to the desired extended position,
being careful not to jam. Turn off power.
Repeat steps 3 through 6 for the silver nut, to
set the extend limit.
The following instructions are based on the
lower switch controlling the extend circuit, and
the upper switch controlling the retract circuit.
Run actuator or rotate tube to desired
retracted position. Be careful not to jam
actuator. Turn off power and remove limit
switch cover.
Loosen the visible setscrew (1/16" hex key)
and rotate the top cam clockwise until the
switch just clicks. Tighten screw.
Restore power. Run actuator out an inch or
two and run back in until switch stops it. Do
not let tube rotate. Check stopping point.
If setting needs further adjustment, turn off
power and tweak cam setting until proper
stopping point is achieved.
Run actuator to the desired extended position,
being careful not to jam. Turn off power.
Loosen the setscrew that is recessed in the
hole on the cam hub. Rotate the lower cam
counter-clockwise until the switch clicks.
Tighten screw.
Repeat step 4 for the lower cam.
Geared cam adjustment (NU models)
1.
2.
3.
4.
5.
6.
7.
8.