Selective Catalytic Reduction (Scr) Monitoring - Generac Mobile MMG35DF4 Owner's Manual

General Information

Selective Catalytic Reduction (SCR) Monitoring

This unit is equipped with a selective catalytic reduction
(SCR) system to meet Tier 4 EPA emissions standards.
This section gives an explanation of the indicators that
are displayed on the SCR status page of the engine tab.
To access the SCR status page, press any direction
button (▲, ►, ▼, ◄) to enter the maintenance screens,
and when on the engine tab, press the ▼ button to toggle
through the pages until the SCR status page appears.
There are four areas on the SCR status page that
communicate various information to the operator. The
areas and the indicators that appear in those areas are
explained here:
HEST Lamp
•
Temperature): This area displays the regeneration
underway indicator above the words HEST LAMP -
SOLID when the unit is in the process of the
exhaust catalyst. During the regeneration process,
the exhaust temperature will be very high.
SCR Lamp: This area displays the regeneration
•
indicator above the words SCR LAMP - SOLID
when auto exhaust filter cleaning is enabled. When
the unit is being operated with auto exhaust filter
cleaning disabled, the indicator will begin to flash
above the words SCR LAMP - FLASHING if the
soot load level goes above 80%.
22
(High Exhaust System
Figure 2-17. DPF Regeneration Lamps
SCR Inhib: This area displays the disabled
•
regeneration indicator above the words SCR INHIB
- SOLID when auto exhaust filter cleaning is
disabled.
Alarm: This area will display the engine alarm
•
indicator above the words ALARM - SOLID when
an alarm condition occurs. This area displays
different text depending
condition occurs.
See DOC and SCR Cleaning Operations
information on the operation of auto exhaust filter
regeneration and service regeneration.
DPF Regeneration Lamps
Depending upon the Engine Type selected in the
module's configuration, the Engine section may include
the DPF Regeneration Lamps page. This page contains
icons (see Figure 2-17) to show the status of various
ECU functions, some of which are applicable to Tier 4
engine requirements. The icons flash at different rates to
show the status of the ECU function, refer to the engine
manufacturer for more information about this.
Owner's Manual for Mobile Generator
upon which alarm
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