Watlow EZ-ZONE PM PID - Manual (Page 113)

Watlow EZ-ZONE ® PM PID Controller • 110 • Appendix
Indication Description Possible Causes Corrective Action
Process doesn’t control to set
point
Process is unstable or never
reaches set point
• Controller not tuned correctly
• Control mode is incorrectly set
• Control set point is incorrect
• Perform autotune or manually
tune system
• Set control mode appropriately
(Open vs Closed Loop)
• Set control set point in appro-
priate control mode and check
source of set point: remote, idle,
profile, closed loop, open loop
Temperature runway Process value continues to in-
crease or decrease past set
point.
• Controller output incorrectly
programmed
• Thermocouple reverse wired
• Controller output wired incor-
rectly
• Short in heater
• Power controller connection to
controller defective
• Controller output defective
• Verify output function is correct
(heat or cool)
• Correct sensor wiring (red wire
negative)
• Verify and correct wiring
• Replace heater
• Replace or repair power con-
troller
• Replace or repair controller
[`100] Device Error
[rEtn]
Controller displays internal mal-
function message at power up.
• Controller defective • Replace or repair controller
Menus inaccessible Unable to access [`SEt], [OP-
Er] , [FCty] or [ProF] menus
or particular prompts in Home
Page
• Security set to incorrect level
• Digital input set to lockout
keypad
• Custom parameters incorrect
• Check lockout setting in Fac-
tory Page
• Change state of digital input
• Change custom parameters in
Factory Page
EZ-Key doesn’t work EZ-Key does not activate re-
quired function
• EZ-Key function incorrect
• EZ-Key function instance not
incorrect
• Keypad malfunction
• Verify EZ-Key function in Setup
Menu
• Check that the function in-
stance is correct
• Replace or repair controller
Troubleshooting Alarms, Errors and Control Issues (cont .)