Watlow Integrated Controller User Manual Rev C EZ-ZONE PM User Manual page 70

Indication
Process doesn't con- Process is unstable or never
trol to set point reaches set point
Temperature runway Process value continues to
increase or decrease past set
point.
[`100] Device Error Controller displays internal
malfunction message at
[rEtn]
power up.
[`h; E r] Heater Error Heater Error
[`C; E r] Load current incorrect.
Current Error
Menus inaccessible Unable to access [`SEt],
[OPEr], [FCty] or [ProF]
menus or particular prompts
in Home Page
EZ-Key doesn't work EZ-Key does not activate re-
quired function
®
Watlow E Z-ZONE PM Inte gr a t e d Con tr ol le r
Description
• Controller not tuned correctly
• Control mode is incorrectly set
• Control set point is incorrect
• 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
• Controller defective
• Current through load is above current
trip set point
• Current through load is below current
trip set point
• Shorted solid-state or mechanical
relay
• Open solid-state or mechanical relay
• Current transformer load wire associ-
ated to wrong output
• Defective current transformer or con-
troller
• Noisy electrical lines
• Security set to incorrect level
• Digital input set to lockout keypad
• Custom parameters incorrect
• EZ-Key function incorrect
• EZ-Key function instance not incor-
rect
• Keypad malfunction
Possible Cause(s)
68
• •
Corrective Action
• 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
• 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
• Replace or repair controller
• 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.
• Replace relay
• Replace relay
• Route load wire through current
transformer from correct output, and
go to the [`C; S i] Source Output In-
stance parameter (Setup Page, Current
Menu) to select the output that is driv-
ing the load.
• Replace or repair sensor or controller
• Route wires appropriately, check for
loose connections, add line filters
• Check lockout setting in Factory Page
• Change state of digital input
• Change custom parameters in Factory
Page
• Verify EZ-Key function in Setup Menu
• Check that the function instance is
correct
• Replace or repair controller
Ap p e nd i x