Watlow Series F4S/D - Manual (Page 24)

3 . 8 ■ O p e r a t i o n s Wa t l o w S e r i e s F 4 S / D
Troubleshooting Alarms and Errors
• Configure output as an alarm.
• Check alarm set points.
• Check the alarm sides setting.
• Check the alarm type setting.
• Check the alarm logic for compatibility with
system peripherals and annunciators.
• Check the power limit setting.
• Check the operation mode.
• Check the alarm output function.
• Check the °C and °F setting.
• Check the calibration offset value. Set it to a
lower level.
• Alarm output may be off.
• Alarm set points may be incorrect.
• Alarm sides may be incorrect.
• Controller may be in diagnostics mode.
• Alarm may be latched. Move cursor to
alarm message. Press ..
• Alarm set points may be incorrect.
• Alarm hysteresis may be incorrect.
• Input may be in error condition.
Alarms
• Alarm won’t occur.
• Alarm won’t clear.
(To clear the alarm, cor-
rect the alarm condi-
tion. If the alarm is
latched, press . with
the cursor at the alarm
message on the Main
Page.)
• Check Communications Setup Menu and set
to correct address.
• Check Communications Setup Menu and set
to correct baud rate.
• Look for a break in the daisy chain.
• Verify correct connections and test wiring
paths.
• Check converter box wiring and its documen-
tation.
• Reconfigure computer’s communications port
setup and verify that communications are
okay.
• Check the communication card documentation
for setable variables and operational testing.
• Restart communications software and check
for settings agreement. Verify the communica-
tions bus is active.
• Verify operation with Watlow communications
tool.
• Address parameter may be incorrectly set.
• Baud rate parameter may be incorrectly
set.
• Unit-to-unit daisy chain may be disconnect-
ed.
•Communications wiring may be reversed,
short or open.
• EIA-485 converter box may be incorrectly
wired.
• Computer communications port may be in-
correctly set up.
• Communications software setup or address
may be incorrect.
• Protocol or parity may be wrong, should be
8, n, 1.
• Application software not working properly.
• May need termination and pull-up and pull-
down resistors.
Communications
• Unit will not
communicate.
• Check switches, fuses, breakers, interlocks,
limits, connectors, etc. for energized condi-
tions and proper connection.
• Measure power upstream for required level.
Check part number for input power required.
• Check wire size.
• Check for bad connections.
• Power to unit may be off.
• Fuse may be blown.
• Breaker may be tripped.
• Safety Interlock door switch, etc., may be
activated.
• Separate system limit control may be
latched.
• Wiring may be open.
• Input power may be incorrect.
Power
• Displays are dead.
Corrective Action Probable Cause(s) Indication