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7/50D Plus or 7/50D Controller Chapter 4: Operation 62
Navigating among the Station Operator Screens
The controls in the upper right-hand corner of the screen enable you to move among the
Station Operator screens:
1. To display the screen for the next lower-numbered station (for example, to move
from the screen for Station 15 to the screen for Station 14), touch ◄ Back.
2. To display the screen for the next higher-numbered station (for example, to move
from the screen for Station 15 to the screen for Station 16), touch Next ►.
3. To display the screen for a specific station, touch Goto. A keypad pops up. Enter the
number for the desired station. Use ← to erase any mistakes. Use ↵ to enter the
value.
4. To exit to the Station Summary (or Pump Summary) screen, touch Stations (or
Pumps).
Adjusting Convey Time and Dump Delay
Convey time is the length of time the station’s vacuum valve remains open to allow material
to be drawn in. (For a volume-fill station, the valve closes when material covers the station’s
volume-fill proximity sensor or this time elapses, whichever comes first.)
Dump delay is the length of time allowed for material to drain from the station into its
receiver. During this time, the controller does not attempt to deliver any more material to the
station.
The settings for convey time and dump delay should match the times actually required to fill
and empty the station. The following problems may occur if these settings are incorrect:
1. Material is backing up and causing “high vacuum” alarms (for time-fill stations
only): Convey time is too long.
2. System is not keeping up with the demand for material: Convey time is too short, or
dump delay is too long.
For your reference, the Station n Operator screen shows the length of time the controller
actually spent conveying material during the most recent delivery under Last Convey
Time.
To adjust a station’s convey time (or the dump delay):
1. Go to the Station n Operator screen (as described on p. 61), or go to the Station n
Setup screen.
2. Touch Convey Time (or Dump Delay).
A keypad pops up.
3. Enter the number of seconds desired. Use ← to erase any mistakes. Use ↵ to enter the
value.
The new setting appears under Convey Time (or Dump Delay).
Note: If you change convey time by more than a few seconds for a station
with a remote proportioning valve (RPV), notify the setup personnel at
your facility. The setting for the RPV’s cycle time should be adjusted to
divide evenly into the new convey time (see pp. 43 and 77).