Sensor Installation Faults - Hydronix Hydro-View HV02 User Manual

SENSOR INSTALLATION FAULTS

Symptom
Cannot see
required menu
item.
Unable to enter
calibration
values.
No analogue
output.
Analogue output
does not change
Digital inputs do
not operate
Relay outputs
do not operate
No serial
communications
Sensor installation faults
The moisture display reading being excessively low, or excessively high, or not changing
at all would normally suggest a fault.
This may be caused by...
faulty interconnecting wiring – most common error
blown DC fuse in Hydro-View
sensor in wrong position
faulty sensor
faulty Hydro-View
The following steps should help to locate the fault.
1. Carefully check the wiring to the sensor in accordance with the information given in
Figure 21 (p58). Take particular care with the cross-over between pins 2 and 3 of the
Bulgin connector and terminals 2 and 3 at the Hydro-View. Also ensure that the two
ground connections at pin 3 of the Bulgin are made correctly and that stray wire
strands from the cable shield are not shorting to other pins within the Bulgin
connector.
2. Disconnect the sensor from the Hydro-View by unplugging the terminal block. Use a
voltmeter to check the sensor power supply voltages at terminals 1-2 (+14.5 to
+15.5Vdc) and 3-2 (-14.5 to -15.5Vdc) at the rear of Hydro-View. If this test fails, the
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HYDRO-VIEW USER GUIDE D0022 REV 1.06
Probable cause
Access code not
entered.
Incorrect order of
moisture value.
Fuse blown
Output set-up is set for
Calibrate variable
No input excitation
power.
Incorrect settings
Fuse blown.
Contacts welded.
Incorrect configuration
Remedy
Enter the access code for the required
facility.
Moisture % 2 must be greater than
Moisture % 1 in calibration screen.
Difference must be >1%.
Check internal fuse FS2 and replace if
necessary.
Check wiring for analogue output and
digital inputs which share a common power
supply.
Go to Output set-up and select relevant
output variable.
If using external 24V power source, check
common connection at terminal 16.
If using internal source, check that you
have linked terminal 16 to 17.
Check internal fuse FS2 and replace if
necessary.
Check alarm and set-point settings.
Check internal fuse FS3 and replace if
necessary. Check external wiring.
Replace plug-in relay.
Check that the serial port has been
enabled for the purpose you require.
If using RS485, verify that the optional
RS485 module is installed.