Remote Setpoint
The VD range does not accommodate the “Remote Setpoint” function input.
Re-Transmission of PV
The VD series can have “Re-transmission” of the process variable (measured temperature) as an analog signal.
You cannot have a retransmission of the set point in the VD series.
RS485 Modbus Comms
The VD series can have RS485 comms. You cannot have both PV Retransmission and RS485 options at the
same time on the same controller.
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ERROR MESSAGE AND TROUBLESHOOTING
Symptom Probable
Solution
-Input signal below the low limit
-Incorrect input sensor selection
-Set a higher value to high limit.
-Check connect input sensor selection.
-Input signal below the low limit
-Incorrect input sensor selection
-Set al lower value to low limit.
-Check correct input sensor selection
-Sensor break error
-Sensor not connected
-Replace sensor
-Check the sensor is connected correctly
Keypad no
function
-Keypads are locked
-Keypads defective
-Set”
”to a proper value
-Replace keypads
Process value
unstable
-Improper setting of Pb, Ti, Td
and CT
-Start AT process to set Pb, Ti, Td
automatically
-Set Pb, Ti, Td manually
No heat or
output
-No heater power or fuse open
-Output device defective or
incorrect output used
-Check output wiring and fuse
-Replace output device
All LED’s and
display not
light
-No power to controller
-SMPS failure
-Check power lines connection
-Replace SMPS
Process Value
changed
abnormally
-Electromagnetic Interference
(EMI) or Radio Frequency
Interference (RFI)
-Suppress arcing contacts in system to
eliminate high voltage spike sources. Separate
sensor and controller wiring from “dirty”
power lines. Ground heaters
Entered
data lost
-Fail to enter data to EEPROM -Replace EEPROM
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