User manual
Maintenance
MarathonSeriesFA/FR 47
Therelayiscontrolledbythetemperatureselectedonthedisplay.Ifanyfailsafecodeappearsonthe
display, the relay changesto the “abnormal” state.The exception is the “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
attenuation is too high,
the unit outputs EIHH onthe LED’s and digital output and 21 mA on the
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 is above 95%, the “dirty window”
threshold.
Outputs:
Display: 1021
RS485: CT1021W0703N0685
Analog: scaledtotemperature,between4and
20mA
Relay: abnormalstate