Charging; Detroit Diesel Engine Control Systems; Features - Kohler 20-2250 kW Operation

Correction
° °
C F
71.1 160 + .032
+ .030
65.6 150 + .028
+ .026
60.0 140 + .024
+ .022
54.4 130 + .020
+ .018
48.9 120 + .016
+ .014
43.3 110 + .012
+ .010
37.8 100 + .008
+ .006
32.2 90 + .004
+ .002
26.7 80 0
- - .002
21.1 70 - - .004
- -. 006
15.6 60 - - .008
- - .010
10 50 - - .012
- - .014
4.4 40 - - .016
- - .018
- - 1.1 30 - - .020
- - .022
- - 6.7 20 - - .024
- - .026
- - 12.2 10 - - .028
The temperature correction amounts to about .004 (4 points) of
specific gravity for each 5.5°C (10°F) change in temperature.
Figure 3-16 Specific Gravity Temperature Correction

3.10.4 Charging

Use a battery charger to maintain a fully charged battery
when the generator set is used in a standby application.
The engine battery-charging alternator charges the
battery only while the generator set is running.
34 Section 3 Scheduled Maintenance
Example No. 1
°
Temperature below 26.7 C (80
Hydrometer Reading 1.250
° °
Acid Temperature --6.7 C (20
Subtract .024 Specific Gravity
Corrected Specific Gravity is 1.226
1.250 -- .024 = 1.226
Example No. 2
°
Temperature above 26.7 C (80
Hydrometer Reading 1.235
°
Acid Temperature 37.8 C (100
Add .008 Specific Gravity
Corrected Specific Gravity is
1.243
1.235 + .008 = 1.243
Note: If the generator set is in a temporary prime power
application in which the generator set has periods
of inactivity, the controller circuitry may drain the
battery. If there is no power source for a battery
charger, place the controller in the prime power
mode, if equipped, or disconnect the battery from
°
F)
the generator set.
F)
3.11 Detroit Diesel Engine Control
Systems
Some generator sets equipped with Detroit Diesel
engines use a DDEC/MDEC system. Access the DDEC
control box inside the generator set junction box to
retrieve codes when performing routine maintenance or
troubleshooting the engine.
°
F)
Note: DDC/MTU engines with MDEC requires the
following method:
°
F)
D
Use a personal computer software package available
from the manufacturer with a translator to access
stored codes. Follow the instructions provided with
the software.
Use the following data for informational purposes only.
Consult the engine literature for complete information
regarding operation and troubleshooting. See List of
Related Materials in the Introduction section. Contact
an authorized service distributor/dealer for service or
diagnostic equipment.

3.11.1 Features

The DDEC/MDEC system optimizes control of critical
engine functions and protects against serious engine
damage resulting from conditions such as the following:
D
Low coolant level
D
Low coolant pressure
D
1-787
High coolant temperature
D
Low oil pressure
D
High oil temperature
The major components of the DDEC/MDEC system
include the electronic control module (ECM) and engine
sensors. The DDEC control box is located in the
generator set junction box.
TP-6161 1/12