Watlow Series F4S/D Manual de usuario descargar pdf (Pagina 24)

3.8 ■ Operations Watlow Series F4S/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 ActionProbable Cause(s)Indication

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