Installation manual

8 Benchmark Series Low-Profile Bench Scale
4.0 Service Information
4.1 Troubleshooting Guide
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 stays at zero
• Indicator faulty: Service indicator
•
Load cell connections faulty: Check cable connections in summing board and at indicator
Erratic weights
• Vibration near scale: Remove source of vibration or move scale.
• Platform not level to within
1
/
4
in: Level scale by adjusting feet or shimming if necessary.
• Load cell or cable water damage: Replace.
• Debris under load cells or platform: Clean.
• Indicator faulty: Use simulator to test indicator for
stability. Service indicator.
Consistently high or low weights
• Indicator not properly adjusted to zero: Zero the i
ndicator according to indicator manual.
• Platform binding: Obtain adequate c
learance for free platform movement.
• Indicator not calibrated: Calibrate according to indicat
or manual and Section 3.3
• Load cells faulty: Test and replace load cells if necessary.
• Feet touching deck underside: Adjust feet downward to provide cle
arance.
4.2 Periodic Maintenance
The space beneath the platform must be periodically cleaned to prevent debris buildup.
Important
Do not attempt to use scales with load cells that are not hermetically sealed in washdown applications.
Water damage is a common cause of failure in non-hermetically-sealed load cells. Use care with high
pr
essure steam washdowns for hermetically-sealed load cells. The steam may not damage the load cells,
but the elevated temperatures may cause incorrect readings until the unit cools to room temperature.