Section 4
ENGINE DC CONTROL SYSTEM
Printed Circuit Board
GENERAL:
The printed board is responsible for cranking, startup, running and shutdown operations. The board intercon- nects with other components of the DC control system to turn them on and off at the proper times. It is pow- ered by fused 12 VDC power from the unit battery.
CIRCUIT BOARD CONNECTIONS:
The circuit board mounts a
Dip Switch Positions:
Note: These switches must remain in the positions set at the factory.
1.Stepper Motor Rotation
a.Switch set to ON for clockwise rotation (Factory Position).
b.Switch set to OFF for counterclockwise rotation.
2.Frequency Setting
a.Switch set to OFF for 60 Hertz (Factory Position).
b.Switch set to ON for 50 Hertz.
| POTENTIOMETERS | |
| RESPONSE | RECOVERY |
DIP SWITCH | DAMPEN | |
|
| |
1) ON |
| SENSING |
2) OFF |
| |
| LED | |
|
| |
| 2 |
|
| 1 |
|
| ON |
|
J2 CONNECTOR |
| |
| J1 CONNECTOR | |
TERMINAL WIRE | FUNCTION | |
|
|
|
1 | 15B | 12 VDC input when the Start Stop Relay |
|
| (SSR) is energized. |
|
|
|
2 | 83 | Ground input when the idle control switch |
|
| (SW2) is placed in the closed position |
|
|
|
3 | TR1 | AC voltage input from the idle control |
|
| transformers. |
|
|
|
4 | 0 | Common ground for the PCB |
|
|
|
5 | 167 | 12 VDC input when SW1 is placed in the |
|
| Start position. Ground input when SW1 is |
|
| placed in the Stop position. |
|
|
|
6 | TR2 | AC voltage input from the idle control |
|
| transformers. |
|
|
|
7 | 86 | Fault shutdown circuit. When grounded |
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| by closure of the Low Oil pressure switch |
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| (LOP) engine will shut down. |
|
|
|
8 | 229 | Switched to ground for Start Stop Relay |
|
| (SSR) operation. |
|
|
|
9 |
| NOT USED |
|
|
|
10 | 44S | AC input for frequency control. |
|
| 11S/44S 240VAC |
|
|
|
11 |
| NOT USED |
|
|
|
12 | 11S | AC input for frequency control. 11S/44S |
|
| 240VAC |
Note: J1 Connector is utilized for governor control.
Figure 4-2. – Receptacle J2
Battery
RECOMMENDED BATTERY:
When anticipated ambient temperatures will be con- sistently above 32° F. (0° C.), use a 12 volts Type U1 storage battery capable of delivering at least 300 cold cranking amperes.
Figure 4-1. – Printed Circuit Board
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