RayTek MARATHON FA - Page 55

Maintenance
MarathonSeriesFA/FR 47
Therelayiscontrolledbythetemperatureselectedonthedisplay.Ifanyfailsafecodeappearsonthe
display, the relay changesto the “abnormal” state.The exception is the “dirtywindow” condition.
This causes the relay to change state, leaving a normal numerical temperature output. The dirty
windowisdetected
ineither1‐coloror2‐colormode.
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
Table11:CurrentOutputValuesinaccordancetoanError
Iftwoerrorsoccursimultaneously,thehigherpriorityerroristheonethatispresentedontheLED’s
digitalandanalogoutputs.Forexample,in2‐colormode,iftheinternalambientistoohighandthe
attenuation is too high,
 the unit outputs EIHH on the 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
presentedsimultaneouslythroughRS485,theiroverandunderrangeconditionsareindependent.

Examplesoffailsafeconditions:
1. One‐color temperature
 is selected for display on the LED’s. Two‐color temperature is
transmittedinburstmode.Widebandtemperatureisunderrange.Two‐colortemperatureis
999°C.
 Outputs:
 Display: EUUU
 RS485: CT0999
 Analog: 2to3mA
 Relay: abnormalstate
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: CT1021W0703N0685
 Analog: scaledtotemperature,between4and
20mA
 Relay: abnormalstate