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MarathonSeriesFA/FR 47
Therelayiscontrolledbythetemperatureselectedonthedisplay.Ifanyfailsafecodeappearsonthe
display,therelaychangestothe“abnormal”state.Theexceptionisthe“dirtywindow”condition.
This causes the relay to change state, leaving a normal numerical temperature output. The dirty
windowisdetected
ineither1‐coloror2‐colormode.
Error Code
0 – 20 mA Output 4 – 20 mA Output
no error according to temperature
according to temperature
ECHH 21 to 24 mA 21 to 24 mA
ECUU 0 mA 2 to 3 mA
EIHH 21 to 24 mA 21 to 24 mA
EIUU 0 mA 2 to 3 mA
EUUU 0 mA 2 to 3 mA
EHHH 21 to 24 mA 21 to 24 mA
EAAA 0 mA 2 to 3 mA
Table11:CurrentOutputValuesinaccordancetoanError
Iftwoerrorsoccursimultaneously,thehigherpriorityerroristheonethatispresentedontheLED’s
digitalandanalogoutputs.Forexample,in2‐colormode,iftheinternalambientistoohighandthe
attenuationistoohigh,
theunitoutputsEIHH ontheLED’sanddigitaloutput and21mAonthe
analog output. However, since 2‐color wide band and narrow band temperatures may all be
presentedsimultaneouslythroughRS485,theiroverandunderrangeconditionsareindependent.
Examplesoffailsafeconditions:
1. One‐color temperature
is selected for display on the LED’s. Two‐color temperature is
transmittedinburstmode.Widebandtemperatureisunder range.Two‐colortemperatureis
999°C.
Outputs:
Display: EUUU
RS485: CT0999
Analog: 2to3mA
Relay: abnormalstate
2. Two‐color temperature is selected for display
on LED’s. All three temperatures are
transmitted in burst mode. Two‐color temperature is 1021°C. Wide band temperature is
703°C.Narrow band temperature is 685°C.Attenuation isabove95%, the “dirtywindow”
threshold.
Outputs:
Display: 1021
RS485: CT1021W0703N0685
Analog: scaledtotemperature,between4and
20mA
Relay: abnormalstate