Tecnetics Industries Tecweigh 20, Operation Manual

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Refer to Section 9.06 for load cell testing and replacement if required. Refer to Section 4.03 for
wiring.
WY10 and WY20 scales:
For the WY10 (1 LVDT) and the WY20 (2 LVDTs) scales, this message indicates a faulty
LVDT signal. Check the Load Count Parameter (Section 6.02.57) and make sure the load counts
increase when the calibration weight is lowered.
Other possible causes of this message are:
•
A LVDT is incorrectly wired to the terminals. Refer to the LVDT wire color code.
•
A LVDT wire(s) is damaged or broken.
•
A loose terminal strip(s) or terminal screw(s).
•
A LVDT(s) is not properly aligned (Section 7.02 (SC200) or Section 7.03 (SC400)).
•
A LVDT spring(s) is broken or off center
•
A LVDT(s) center plunger is stuck
•
A LVDT(s) has a pit in the surface of the deflection arm.
Refer to Section 9.07 for LVDT testing, and replacement if necessary. Refer to Section 4.04 for
wiring.
“LOW POWER”
This message indicates insufficient power to the signal conditioner. Possible causes of this
message are:
•
AC power to the WP20 is less than 100 VAC on the AC power version.
•
DC power to the WP20 is less than 9 VDC on the DC power version.
•
The WP20 ( AC power version) is not pro30 VDC across terminals 10 and 29.
•
The WP20 ( DC power version) is not pro28 VDC across terminals 10 and 29.
•
The cable between the WP20 and the signal conditioner is longer than 4000 feet.
•
Attached devices, such as a chart recorder, are drawing more than 1 amp total.
•
There is a break or short in the cable between the WP20 and the signal conditioner.
Refer to Sections 9.02 and 9.03 for more comprehensive electrical troubleshooting.
“SCALE DATA ERROR”
This message indicates a communications problem between the WP20 and the scale (signal
conditioner (SC)).
Possible causes of the message are:
•
Terminals 20 and 22 are wired backwards (reverse wired).
•
The WP20 ( AC power version) is not pro30 VDC across terminals 10 and 29.
•
The WP20 ( DC power version) is not pro28 VDC across terminals 10 and 29.
•
The cable distance between the WP20 and the SC is longer than 4000 feet.
•
There is a break or short in the cable between the WP20 and the SC
•
Either the processor or SC or both have been damaged by a power surge or lightening.
Refer to Sections 9.02 or 9.03 for more comprehensive electrical troubleshooting.