User manual

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The user can enable/disable the DTC feature and configure its behavior with the
following settings.
DTC DISPLAY – This setting enables or disables active fault messages (DM1)
monitoring. When the DTC DISPLAY feature is enabled the GSC400 can
receive active faults in the RUNNING, OFF and AUTO modes on the J1939 bus.
Any new received active faults will trigger a message "NEW ACTIVE DTC" and
the user can read the message on the GSC400 front panel display. This new
message will also be stored into the controller’s event log if this feature was
enabled.
ACTIVE LOG DTC - The setting enables/disables the storing of active faults
(DM1) in GSC400 Event Log. The Event Log reserves 30 storage locations for
DM1 messages.
READ STORED DTC – The setting enables/disables the ability to request stored
fault codes from the ECM (DM2). When this setting is enabled the GSC400 will
allow manually triggered requests of stored faults from the ECM’s memory (DM2).
3.8.3 Cummins Idle Speed
The GSC400 can switch between idle and normal operating speed on Cummins
generators. When the fuel relay is on, the GSC400 continuously sends out a
speed command every 250ms to tell the generator which of the two speeds to
run at. A configurable switched input must be set to Idle Mode (see Table 18 on
page 67) and when this switched input is active the generator runs at idle speed;
otherwise it runs at normal operating speed.
To enable this feature set Cummins Idle to GCP Enable or GC1 Enable. GC1 is
the newest protocol while for older engines you will need to use GCP.
If you are powering the ECM externally you may get an error message (if
Cummings Idle Speed and Diagnostic Trouble Codes are enabled – see below),
“J1939 Erratic”. The ECM expects the speed update to be sent continuously and
if it is not the ECM thinks there is a problem with the J1939 communications.
3.8.4 Volvo EMS2B
If you selected Volvo EMS2B from the Manufacturer submenu there are two
additional parameters you can set:
1. EMS2B Freq Sel (Frequency Selection – Primary or Secondary)
2. EMS2B Acc Pedel (Acceleration Pedal Position – 40% to 60%)
Please consult the Volvo ECU manual for more information.