Endurance
®
Series
Users Manual, Rev. 2.0, Jun 2020
116
Table 13-2: Fail-Safe Error Codes
Condition
2-color
1-color
(wide band)**
1-color*
(narrow band)**
Heater control temperature over range
ECHH
ECHH
ECHH
Heater control temperature under range
ECUU
ECUU
ECUU
Internal temperature over range
EIHH
EIHH
EIHH
Internal temperature under range
EIUU
EIUU
EIUU
Wide band detector failure
EHHH
EHHH
<temperature>
Narrow band detector failure
EHHH
<temperature>
EHHH
Energy too low
EUUU
<temperature>
<temperature>
Attenuation too high (>95%)***
EAAA
<temperature>
<temperature>
Attenuation too high >95%
("dirty lens", relay will go to “alarm” state)***
<temperature>
<temperature>
<temperature>
2-color temperature under range
EUUU
<temperature>
<temperature>
2-color temperature over range
EHHH
<temperature>
<temperature>
Wide band temperature under range
<temperature>
EUUU
<temperature>
Wide band temperature over range
<temperature>
EHHH
<temperature>
Narrow band temperature under range
<temperature>
<temperature>
EUUU
Narrow band temperature over range
<temperature>
<temperature>
EHHH
* only available via ASCII command
** wide and narrow band stands for the first and the second wavelength in 2-color mode
*** note that the activation levels for these conditions may be set to different values (e.g., "dirty lens" at 95%, EAAA at 98%)
Table 13-3: Error Codes for Analog Output
Error Code
0 to 20 mA
4 to 20 mA
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
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.
If two or more errors occur simultaneously, the error with the highest priority overrules the lower priority errors. The
highest priority error will be displayed on the temperature display and the assigned analog output value (see Table
13-3) will be set. For instance, in 2-color mode, if the internal ambient temperature is over the limit and the
attenuation is too high, the unit outputs EIHH to the temperature display and sets an analog output current of
21 mA. However, since 2-color wide band and narrow band temperatures may all be presented simultaneously
through digital interface, their over and under range conditions are independent.
