User`s manual

Watlow EZ-ZONE
®
PM PID Controller • 60 • Appendix
Indication Description Possible Cause(s) Corrective Action
Process doesn’t con-
trol 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 appropriate
control mode and check source of set
point: remote, idle, profile, closed loop,
open loop
Temperature runway Process value continues to
increase or decrease past
set point.
• Controller output incorrectly pro-
grammed
• Thermocouple reverse wired
• Controller output wired incorrectly
• Short in heater
• Power controller connection to con-
troller defective
• Controller output defective
• Verify output function is correct (heat
or cool)
• Correct sensor wiring (red wire nega-
tive)
• Verify and correct wiring
• Replace heater
• Replace or repair power controller
• Replace or repair controller
[`100] Device Error
[rEtn]
Controller displays internal
malfunction message at
power up.
• Controller defective • Replace or repair controller
[`h;Er] Heater Error
Heater Error • Current through load is above current
trip set point
• Current through load is below current
trip set point
• Check that the load current is proper.
Correct cause of overcurrent and/or en-
sure current trip set point is correct.
• Check that the load current is proper.
Correct cause of undercurrent and/or
ensure current trip set point is correct.
[`C;Er]
Current Error
Load current incorrect. • Shorted solid-state or mechanical
relay
• Replace relay
• Open solid-state or mechanical relay • Replace relay
• Current transformer load wire associ-
ated to wrong output
• Route load wire through current
transformer from correct output, and
go to the [`C;Si] Source Output In-
stance parameter (Setup Page, Current
Menu) to select the output that is driv-
ing the load.
• Defective current transformer or con-
troller
• Replace or repair sensor or controller
• Noisy electrical lines • Route wires appropriately, check for
loose connections, add line filters
Menus inaccessible
Unable to access [`SEt],
[OPEr], [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 Factory 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 incor-
rect
• Keypad malfunction
• Verify EZ-Key function in Setup Menu
• Check that the function instance is
correct
• Replace or repair controller