Watlow Electric EZ-ZONE PM, User Manual, Page: 159 / 181

Watlow EZ-ZONE
®
PM Integrated Controller
•
156
• Chapter 11
Appendix
Indication Description Possible Cause(s) Corrective Action
Temperature runway Process value continues to
increase or decrease past set
point.
• Controller output incorrectly pro -
grammed
• Verify output function is correct (heat
or cool)
• Thermocouple reverse wired • Correct sensor wiring (red wire nega -
tive)
• Controller output wired incorrectly • Verify and correct wiring
• Short in heater • Replace heater
• Power controller connection to con -
troller defective
• Replace or repair power controller
• Controller output defective • Replace or repair controller
[`100]
Device Error
[rEtn]
Controller displays internal
malfunction message at
power up.
• Controller defective
• Sensor input over driven
• Replace or repair controller
• Check sensors for ground loops, re -
verse wiring or out of range values.
[`h;Er]
Heater Error Heater Error • Current through load is above 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.
• Current through load is below current
trip set point
• 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 • Check
[`loC]
settings in Factory Page
• Enter appropriate password in
[UloC]
setting in Factory Page
• Digital input set to lockout keypad • Change state of digital input
• Custom parameters incorrect • Change custom parameters in Factory
Page
EZ-Key/s don’t work EZ-Key/s does not activate
required function
• EZ-Key function incorrect • Verify EZ-Key function in Setup Menu
• EZ-Key function instance not incor -
rect
• Check that the function instance is
correct
• Keypad malfunction • Replace or repair controller
[ual;l]
Value to low
Value to low to be displayed
in 4 digit LED display
<-1999
• Incorrect setup • Check scaling of source data
[ual;h]
Value to high
Value to high to be displayed
in 4 digit LED display
>9999
• Incorrect setup • Check scaling of source data