Red Lion DLC - Manual (Page 27)

27
TROUBLESHOOTING
PROBLEM CAUSE REMEDIES
Power LED will not light Controller power Check controller power connections and voltage level
Process Value not changing or incorrect Check input signal connections and signal level
Check proper channel setup, reading and connections
Check input setup, scaling values, and re-download
Alarms not functioning properly Adjust alarm value, alarm hysteresis, and setpoint
value to ensure valid trigger points
Process Value stays at -32001 or +32001 Input Signal (sensor) under-range or over-range * Check input type, level, channel, jumpers and
re-download. Replace sensor. Perform calibration.
Process Value stays at -32002 Shorted RTD sensor * Check input sensor, level, channel, jumpers and
re-download. Replace probe.
Process Value stays at +32002 Open TC or RTD sensor * Check input sensor, level, channel, jumpers and
re-download. Replace probe.
Process Value stays at -32003 or +32003 Check input level, scaling, jumpers and re-download
Process Value stays at +32100, All LEDs
Flashing, Alarms disabled
Will not communicate (Comm. LED not flashing) Verify DLC communications setup
Go to pull down menu SETTINGS,PC PORT SETTING
Try switching A+ and B- lines
Input signal
Incorrect channel
Incorrect programming
Calculated trigger points are over +32000 or below -32000
Process Value underrange (<-32000) or overrange (>+32000)
Incorrect serial settings (DLC port)
Incorrect serial settings (computer port)
Incorrect wiring
Note: The DLC serial settings must match the device that it is communicating with. If you do not know or cannot recall
the DLC settings, they can be reset back to factory defaults. Simply jumper the Default Serial terminal to Input
Common or by putting the Default Serial setting DIP switch in the “UP” position.
* Can also be monitored by accessing coils 5-8 and 17-20, or register 40504.
† Can also be monitored by accessing coils 1-3, 29-30 or register 40505.
For further technical assistance, contact technical support.
Re-download SFDLC file
Perform calibration procedure
Consult Factory
Check A & B Setpoint Ramp Rate and Hold Time
Segments. Change minimum of 1 segment register for
each channel to cause a new checksum to be written
Consult Factory Parameter checksum error †
Calibration checksum error †
Integral and Offset/Manual Power checksum error †
Setpoint Controller Segment Memory checksum error †
Setpoint Controller Status Memory checksum error †