Troubleshooting
25
3.3 Testing Relay Circuits
Use the following steps to check out the relay circuits:
1. Relay connections consist of a double-pole double-throw
(DPDT) relay.
2. The relay contacts are brought out to terminal strips for
external switching. See Figure 3-2.
3. Relay operation may generally be heard as an audible click
when background noise is not too high. Connect ohmmeter
to relay contacts to determine if they are switching.
4 6 75 8 9
NOTE:
Relay Shown as Power Off
Figure 3-2
Relay Circuit Operation
3.4 Over Range
If the GREEN LED is ashing, the instrument has detected
the uncovered sensing element capacitance exceeds the limits
of the transmitter. Consult factory instructions.
3.5 Under Range
If the RED LED is ashing, the instrument has detected the
sensing element capacitance is too small. Consult factory for
sensing element capacitor values.
To Next Page
Loading...