Salter Brecknell 7550 - Manual (Page 6)

the front edge blocks it. See Figure 2 for photocell module proper program-
ming information. Typically, if they are not programmed properly, the
system will weigh properly when tested statically, but the weights will be
light when weighing in motion. Photocell operation can be tested by
blocking the entrance photocell and then clearing the photocell path. The
indicator should not begin averaging (WI-127 will go to dashes) until after
the photocell is cleared. The exit photocell should cause the indicator to
display the averaged weight as soon as it is blocked.
Photocell Synchronization – Whenever the indicator is first Whenever the indicator is first Whenever the indicator is first Whenever the indicator is first Whenever the indicator is first
powered up, or the entrance photocell has been triggered without powered up, or the entrance photocell has been triggered without powered up, or the entrance photocell has been triggered without powered up, or the entrance photocell has been triggered without powered up, or the entrance photocell has been triggered without
the exit photocell being triggered, the system needs to be
the exit photocell being triggered, the system needs to be the exit photocell being triggered, the system needs to be the exit photocell being triggered, the system needs to be the exit photocell being triggered, the system needs to be
synchronized. This is done by momentarily blocking the exit
synchronized. This is done by momentarily blocking the exit synchronized. This is done by momentarily blocking the exit synchronized. This is done by momentarily blocking the exit synchronized. This is done by momentarily blocking the exit
photocell. If you do not do this, the first item through will
photocell. If you do not do this, the first item through will photocell. If you do not do this, the first item through will photocell. If you do not do this, the first item through will photocell. If you do not do this, the first item through will
resynchronize the indicator, but that weight will not be averaged
resynchronize the indicator, but that weight will not be averaged resynchronize the indicator, but that weight will not be averaged resynchronize the indicator, but that weight will not be averaged resynchronize the indicator, but that weight will not be averaged
or transmitted.
or transmitted. or transmitted. or transmitted. or transmitted.
The conveyor scale should be checked for weighing accuracy after it is
installed. Follow these procedures to check the weighing accuracy.
DO NOT RUN THIS TEST WITH THE BELT RUNNING.
1. Power up the indicator and press ZERO…
"O" is displayed on the indicator.
2. Place a test weight not greater than 25% of scale capacity on a
corner of the conveyor belt.…
Weight is displayed on the indicator. Check this for accuracy.
3. Repeat step two for all four corners. There are three possibilities:
A..... The four weight readings are identical and correct.
B. The four weight readings are identical and incorrect.
C. The four weight readings do not agree.
If A occurs, the scale is ready for use.
If B occurs, recalibrate the indicator following the instructions in the
indicator calibration section (Calibrating the WI-127) of this manual.
If C occurs, proceed to step 5 under Balancing Weigh Bars Routed
Through a Junction Box, then repeat this test.
1. Power up the conveyor scale…
Make sure all portions of the system are working properly,
especially the two sensors.
2. Power up the indicator and press ZERO… … … … …
"0" is displayed on the indicator.
3. Start the conveyors leading to and from the scale…
Material should move toward the scale.
4. Material passes entry photocell…
Dashes are displayed while weighing is in process.
Checking Scale Function
Operating the
Conveyor Scale
3