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Summing Junction Box
Introduction
Summing Junction Box
Installation Guide
-Controls
-Mounting
-Wiring
-Leveling
Summing Junction Box
Calibration
Summing Junction Box
Troubleshooting Guide
Summing
Junction Box
Features &
Specifications |
Summing-J-Box Installation
Scale Leveling Using the Summing Junction Box
NOTE: The Summing Junction Box, as
shipped from the factory, is preset to a null state. If the settings have been
changed the Summing Junction Box must be reset to null before proceeding. To
null: unplug all load cell connectors and turn all switches to 0.
Be sure R-CAL switch is in the weigh position. Turn all SPAN
potentiometers fully counter clockwise. Turn on one load cell switch at a time and adjust
the corresponding ZERO potentiometer for 0.000 mVdc monitored at the
signal test points. Do this for each load cell circuit. Reinstall load cell connectors.
The Summing Junction Box is now in a null state.
Scale leveling is perhaps the most important part of scale
installations. Proper leveling provides excellent accuracy and repeatability when
performed properly. It is recommended that a multiple load cell scale be leveled within
one one-thousandths(0.001") of an inch. This goal is readily achieved for the
majority of applications. There are a few applications where this goal may be
unattainable. In either case the achievement of this goal should be determined by the
installer.
NOTE: If tare weight is not equal
per load cell, the operator must use his / her own judgement to determine when the scale
is level.
- Turn OFF all Summing-J-Box switches.
- Turn ON one switch that corresponds with the leg of the scale
to be checked. Record the weight (millivolt) output of each leg. Turn OFF the switch.
- Repeat step 2 for each leg.
- Adjust the scale legs until these readings are within 1 to 2
millivolts of each other. When this is achieved, the scale can be considered level.
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