Setra System Model 730 - Manual (Page 12)

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6.0 Maintenance & Troubleshooting
There are no general maintenance requirements for the Model 730 other than
periodic zero adjustment. If the unit fails to operate when received or if the
unit appears damaged, notify Setra Systems or your supplier immediately.
Retain packaging materials for inspection. Do not use if damaged. If the Model
730 is not going to be used immediately then replace the protective flange
cover and store in suitable conditions described in Section 2.
If no obvious damage has occurred, a few simple checks can be made to verify
proper installation. Table 2 shows the solution to common problems with the
installation. If none of these problems/solutions are applicable, then please
contact a Setra Systems applications engineer for further assistance.
Table 2: Common Installation Problems & Solutions
Problem Cause Solution
Incorrect or no supply voltage Ensure power supply is
No signal output used as specified in Section 3.
Readout display short circuit or Ensure impedance of readout
incorrect impedance unit is > 10 k Ω
Incorrect wiring Ensure wiring conforms to
Signal output diagrams in Section 3.0
reads Potential difference between Ensure common chassis
over-range chassis ground of unit , power ground between unit, power
supply and readout / display supply and display.
Incorrect zero adjustment Adjust zero per section 5.1
Signal output Readout display incorrect Ensure impedance of
reads impedance readout unit is > 10 k Ω .
under-range Incorrect wiring polarity to Ensure wiring conforms to
readout display diagrams in Section 3.0
Chassis ground not connected Ensure common chassis
ground between unit, power
supply and display.
Unstable signal Unstable or unregulated Use a regulated power supply
supply power supply as specified in Section 3.0.
Electrical noise on chassis Ensure common chassis
ground ground between unit, power
supply, and display.