Performance Check With Full Load - Vertical Express I-2 Manual

Final Adjustments
Valve-Up Section
(continued)

Performance Check with Full Load

16
Down Slowdown
The effect of the down slowdown adjustment is the opposite of the previous adjustments.
Turning OUT on the down slowdown adjustment shortens the leveling zone. Turning IN on
the down slowdown adjustment lengthens the leveling zone. Make this adjustment in small
increments as soon as a change is observed in the leveling zone. The car will overshoot the
landing if the adjustment is turned OUT too far.
1. Turn the down slowdown adjustment OUT in small increments until the car has a level-
ing zone of 3 to 4 inches.
Typical adjustment:
a. Ensure that the down slowdown adjustment screw is 3 turns out from closed.
b. Make single, complete turns, one at a time, until the slowdown leveling changes.
c. Turn the down slowdown adjustment screw less than 1 turn to achieve 10 to 12
FPM and 3 to 4 inches of leveling.
2. Use the UIT to verify the leveling zone by selecting Show Stabilized Leveling.
It may be necessary to slightly alter the point in the hoistway where the slowdown is initi-
ated to achieve optimum valve and car performance. This action is usually accomplished by
either switch location or selector settings.
1. Place a capacity load on the car.
2. Run the car on Automatic Operation, and check its performance at all floors.
• Valve functions are firmer at upper landings. Adjustments affect empty
car performance.
• The down leveling speed increases and the down leveling zone shortens. It may be nec-
essary to change the down slowdown adjustment to verify at least 2 inches of leveling.
• If necessary, turn IN on the down slowdown adjustment to increase the down
leveling zone.
• The up leveling speed increases. The up leveling zone changes between no load and
full load. Do not change any adjustments made with no load if there is at least one 1
inch of up leveling zone with a full load.
• If necessary, turn OUT on the up slowdown adjustment to increase the up leveling zone.
3. Verify that the car reaches full speed in both directions on a one-floor run.
4. Record the working pressure in the up direction.
The working pressure value is used in the next procedure.
5. Remove the capacity load from the car.
I-2 / I-3 Valve
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