Instruction Manual

Watlow Series PD ■ 144 ■ Chapter 11 Troubleshooting
Indication Probable Cause(s) Corrective Action
Power LED not lit.
Controller appears dead.
No communications to PC.
• Power supply switch off.
• Fuse blown.
• Breaker tripped.
• Safety interlock door switch activated.
• Separate system limit control latched.
• Wiring incorrect or open.
• Power supply voltage incorrect.
• Defective controller.
• Turn switch on.
• Replace fuse (check cause of failure).
• Reset breaker (check cause of failure).
• Close door.
• Reset limit controller.
• Check wiring.
• Verify input power
• Repair or replace controller.
Ethernet Link LED not lit.
No communications to PC.
•
Incorrect cable.
• Defective PC or switch/hub.
• Defective controller.
•
Replace cable - use straight cable for
switch/hub, cross cable for direct con-
nection to PC.
• Replace Ethernet port on PC or
switch/hub.
• Repair or replace controller.
Ethernet Link Activity LED
not lit.
No communication to PC.
• Incorrect IP address assignment.
• Incorrect PC set-up.
• Defective controller.
• Assign same logical address. Fixed IP
address may have been assigned.
• Ensure Microsoft Client and Netbios
is loaded.
• Repair or replace controller.
Input Error LED lit.
Sensor over range, under
range message on PC.
• Open sensor.
• Shorted sensor.
• Process has exceeded operating range.
• Incorrect sensor configuration.
• Defective controller.
• Replace sensor.
• Repair wiring or replace sensor.
• Operate controller within sensor oper-
ation range.
• Configure Analog Input to correct
sensor type.
• Repair or replace controller.
Ambient error message on
PC.
• Temperature is less than 0°C (32°F)
or greater than 65°C (149°F).
• Controller calibration is incorrect or
corrupt.
• Defective controller.
• Regulate temperature in cabinet.
• Recalibrate controller.
• Repair or replace controller.
No Output from controller.
Output always active.
Output always inactive.
• Incorrect wiring.
• DC voltage used with AC output.
• External voltage is not supplied for
appropriate outputs.
• Wrong output choice.
• Incorrect configuration.
• Power limit is in effect or in open loop
mode.
• Defective controller.
• Correct wiring, see wiring section.
• K output is for AC control, C & F
output is for DC control.
• Wire correct voltage to be controlled
for appropriate output, see wiring sec-
tion.
• Replace controller with correct out-
puts.
• Configure Control Loop, PID, and Output.
• Adjust power limit or change to closed
loop mode.
• Repair or replace controller.
Troubleshooting
11