InteliGen
NT
, InteliSys
NT
, InteliMains
NT
 – Troubleshooting Guide, 
SW version IGS-NT-3.1.0, IM-NT-3.1.0, ©ComAp – August 2018      2 
IGS-NT Troubleshooting Guide.pdf 
Table of Contents 
Table of Contents .................................................................................................................................... 2 
General guidelines ................................................................................................................................... 4 
Available related documentation ............................................................................................................. 5 
Troubleshooting ....................................................................................................................................... 6 
Communication ................................................................................................................................... 6 
RS232(x) communication doesn’t work .......................................................................................... 6 
RS232(2) / RS485(2) / USB communication doesn’t work ............................................................. 6 
Problem  accessing controller after configuration programming error ............................................ 6 
Modem TC35i does not respond to SMS commands ..................................................................... 6 
Unsuccessful controller programming ............................................................................................ 7 
How to check that CAN communication between controllers works .............................................. 8 
CAN communication does not work................................................................................................ 9 
Controller interface ............................................................................................................................ 10 
Setpoints setting cannot be changed............................................................................................ 10 
Controller does not react to buttons pushing ................................................................................ 10 
Controller mode cannot be changed............................................................................................. 10 
Some setpoints cannot be changed even if correct password is used ......................................... 11 
Unknown alarm is displayed ......................................................................................................... 11 
Wrong display HW message ........................................................................................................ 11 
Configuration table error ............................................................................................................... 11 
Display is blank and LEDs are neither blinking nor glowing ......................................................... 12 
Display is blank, but backlight works ............................................................................................ 12 
Display is showing “Unsupported code page” .............................................................................. 12 
INIT is displayed and controller mode cannot be changed .......................................................... 12 
External display problems ................................................................................................................. 12 
No reaction to pushing command buttons  or setting adjustments ............................................... 12 
InteliVision/InteliVision 8 and image retention .............................................................................. 13 
Synchronizing, Load control .............................................................................................................. 14 
Gen-set voltage is increasing/decreasing over/under the limits during synchronization .............. 14 
GCB is opened before the Load ramp time is over ...................................................................... 14 
Sync fail alarm is issued ............................................................................................................... 14 
MGCB is not closed even all conditions are fulfilled ..................................................................... 14 
IM-NT BTB connects dead buses together .................................................................................. 15 
Power management .......................................................................................................................... 15 
Gen-set doesn't share load with other gen-sets ........................................................................... 15 
Running Hours Equalization does not work properly.................................................................... 15 
Load shedding is active although not all gensets are loaded ....................................................... 15 
MGCB is not closed although gensets are running ...................................................................... 16 
PC software ....................................................................................................................................... 17 
There is no history in .ant file ........................................................................................................ 17 
History is not complete ................................................................................................................. 17 
Electrical measurement ..................................................................................................................... 17 
Controller measures wrong generator/mains/bus voltages or currents ........................................ 17 
Power measurement does not work ............................................................................................. 18 
Other ................................................................................................................................................. 20 
SummerTime Mode causing time rollback and time desynchronization ...................................... 20 
Wrn addr error occurs when updating to new FW ........................................................................ 20 
Statistic values window contains strange numbers upon start-up ................................................ 20 
Alarms stays in Alarm list even though Fault reset was used to acknowledge them ................... 21 
No active call after some protection has been activated .............................................................. 21 
Forgotten controller  password ..................................................................................................... 21 
PID regulator doesn't work in the same way as in IS-CU ............................................................. 21 
MCB fail / GCB fail alarm is issued after switching controller on .................................................. 21 
How to … ............................................................................................................................................... 23 
Special applications .......................................................................................................................... 23