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17
INSTALLATION START-UP
START-UP INSTRUCTIONS
After the drive is mounted and its wiring
connections are made, it is ready to be tested for
proper operation.
Turn on the power supply. Operate the
drive with the Handswitch and run it through its
full stroke, both directions. Observe that the
driven device travels through its desired stroke.
If satisfactory, set Handswitch at the “auto”
position.
If the drive is to be operated with automatic
control, turn on the controller and operate the
drive by varying the control signal. Check that
the valve strokes in the proper direction for a
change in control signal. An increasing control
signal retracts the shaft and opens the valve.
With a 100% signal, the drive is fully retracted. If
the valve does not stroke in the proper direction,
first check for proper wiring connections and
verify the control signal at the drive. If the wiring
is correct, then reverse the direction of travel (see
page 25).
If the drive is to be push-button actuated,
(options 3, 4, 5 or 6) operate the drive using the
Handswitch and observe that direction of travel
is correct. When travel of the driven device is
satisfactory with reference to the control signal or
the push-buttons, the unit is ready for operation.
Valve Seating Adjustment
The drive has a Tight-Seater™ attached to
its output shaft. The Tight-Seater™ allows tight
seating of the valve plug. It is a pre-loaded
coupling that allows the valve plug to seat before
the drive reaches its lower limit. The additional
amount of travel compresses the thrust discs
inside the Tight-Seater™, causing a controlled
amount of thrust to hold the valve plug on its
seat when the drive stem reaches its lower limit.
The Tight-Seater™ is factory-set to produce a
thrust matched to the valve and should never be
disassembled. Control of the amount of valve
stem threaded into the Tight-Seater™ may be
used to adjust the valve seating.
If readjustment of valve seating is necessary,
proceed as follows:
1. With the Handswitch, run the drive to a
position above the 0% or lower limit position.
2. Loosen the lock nut on the valve stem and
thread the valve stem into the Tight-Seater™.
3. Run the drive to the 0% position, using the
Handswitch.
4. Thread the valve stem out of the Tight-Seater™
until the plug seats in the valve.
5. Raise the drive shaft using the Handswitch
until the plug is clear of the seat and there
is sufficient clearance to make the following
adjustment.
6. Thread the valve stem out of the Tight-Seater™
a fraction of a turn according to the valve stem
thread as listed (1/32" travel):
7. Tighten the lock nut and index disc on the
valve stem.
8. Run the drive to its lower limit using the
Handswitch. The valve stem should stop
before the drive shaft stops.
9. Reposition the travel index.
CAUTION
If the valve stem is threaded directly into
the drive shaft without a Tight-Seater™, the
valve stem should be at least 1/4 turn from
the seated plug position when the drive shaft
reaches the lower limit. This will prevent
damage to the valve stem or seat. Do not
attempt to obtain tight shut-off without a
Tight-Seater™ as serious valve damage may
result.