HINT 
When internal RTC battery becomes flat, controller function (e.g. Ready for stand by) does 
not change until controller power supply is switched off. Some time before the battery is 
completely exhausted, a warning message appears in Alarmlist: "RTCbatteryFlat". 
After the next power switch on (with flat battery already) controller: 
Stays in the INIT state (not possible to run genset) 
All History records disappear except of “System log: SetpointCS err” record 
Time and Date values are set to zero 
Statistics values are random 
20.2.  Operating conditions 
IG-NT, IG-NTC, IM-NT            -20  +70°C 
IG-NT-LT, IG-NTC-LT, IM-NT-LT          -40  +70°C 
IS-NT-system** operating temperature        -20..+70
o
C * 
IS-NT-BB operating temperature          -40..+70
o
C * 
IG/IS/IM BB NT and NTC versions (operating temperature)  -30  +70°C 
IG/IS/IM BB NT and NTC versions (storage temperature)    -40  +80°C 
IS-NT*** operating temperature (LT version)      -40..+70
o
C * 
Storage temperature              -30..+80
o
C