Watlow ez-zone pm - Page 123

Watlow EZ-ZONE
®
PM Integrated Controller • 120 • Chapter 11 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 •Performautotuneormanuallytune
system
•Controlmodeisincorrectlyset •Setcontrolmodeappropriately(Open
vs Closed Loop)
•Controlsetpointisincorrect •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
•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
[`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