8
RoughDeck PW-1 Installation Manual
4.0
Service information
4.1
Troubleshooting
4.2
Periodic Maintenance
The space beneath the platform must be periodically cleaned to prevent debris build up.
Do not attempt to use scales with load cells not hermetically sealed in washdown applications.
Water damage is a common cause of failure in non-hermetically-sealed load cells
Use care when using high pressure steam washdowns for hermetically-sealed load cells. The steam may not
damage the load cells, however, elevated temperatures may cause incorrect readings until the unit cools to
room temperature.
4.3
Load Cell Replacement
Figure 4-1. Load Cell Assembly
4.3.1
Remove Load Cell
1. Lift scale with chains and a proper spreader bar. See Figure 2-1
2. Remove the defective load cell.
3. Remove the foot from the load cell.
4. Disconnect the load cell cable from the junction box and cut the
cable ties.
5. Pull the cable out of the scale frame channels.
4.3.2
Install Load Cell
1. Set the new load cell near the corner it is to be installed.
2. Thread the cable from the load cell through the conduit tubing in the frame to the junction box according to
the wiring diagram in Figure 4-2.
Figure 4-2 displays both the scale and the junction box as viewed from the bottom. To verify
correct load cell/junction box terminal matching, see the numbers on the terminals inside the
junction box and the corner numbering diagram in Figure 4-2.
Issue
Cause
Solution
System does not
operate
No display
Power disconnected
Check and reconnect
Indicator fuse blown
Replace fuse; check for cause
Interface cable cut or disconnected
Repair
Signal leads incorrectly installed at indicator
Install according to indicator installation manual
Display remains at zero
Indicator defective
Service indicator
Load cell connections defective
Check cable connections in junction box and at indicator
Erratic weights
Vibration near scale
Remove source of vibration or move scale
Platform not level to withiin 1/4''
Level scale by adjusting feet or shimming if necessary
Water damage to load cell or cable
Replace
Debris under load cells or platform
Clean
Indicator defective
Use simulator to test indicator for stability
Service indicator
Consistently high or low
weights
Indicator not properly adjusted to zero
Zero the indicator according to indicator manual
Platform binding
Obtain adequate clearance for free platform movement
Indicator not calibrated
Calibrate according to the indicator manual and
Section 3.3 on page 7
Load cells defective
Test and replace defective load cells
Feet touching deck underside
Adjust feet downward to provide clearance
Table 4-1. Troubleshooting
Important
Note
