Manual 26174
EGCP-2 Engine Generator Control Package
Woodward
35
Here is an example using a
passive resistive type
sensor.
What you need to know:
1. Direct or Indirect type
o
Direct – Increase in resistance is an Increase in Pressure
o
Indirect – Increase in resistance is a Decrease in Pressure
2. Resistance value at High and Low Pressure or Temperature settings
wanted
3. Example: VDO Temperature sender - # 323-477
a. 0—250 °F, ¼ - 18NPT
b. Indirect
type
c. Resistance at 200 °F = 48
Ω
d. Resistance at 80 °F = 506
Ω
4. Other VDO # 323 –XXX will react the same as this sender
5. DIP Switch # 2
a. Close switch 1, because of resistive sender
b. Close switch 2, Shunt resistor due to resistance range going
over 500
Ω
6. Connect 1 k
Ω
, 10 turn, 1 W potentiometer across terminals 66(+) and
67(–)
a. Set for 48
Ω
b. Calibration
Menu
i. Adjust
Water
Temp
Gain
for 200 °F reading
c. Set potentiometer for 506
Ω
d. Calibration
Menu
i. Adjust
Water
Temp
Offset
for 80 °F reading
e. Repeat steps a–d until no more adjustment is needed
7. Disconnect potentiometer and connect VDO Water Temperature Sender
a. This is a 2 wire sender (323-477)
i. This is not a polarity sensitive connection. The 2 wires
coming from the sender should only connect to the
EGCP-2 control.
b. If you are using a different VDO sender (323-XXX) that is only a
1 wire sender:
i. Connect the 1 wire to terminal 66(+)
ii. Terminal 67(-) must be connected to the case ground of
the sender. This is commonly Battery Negative.
8. You need a temperature gauge on the engine to do the final calibration.
9. Start the engine and let stabilize at operating temperature.
10. Compare the Water Temperature reading on the EGCP-2 to the
Temperature gauge on the engine.
11. If they do not read within ±2 degrees, In the Calibration menu adjust the
Water Temperature Gain until the readings agree. Always press the
ENTER key to save the new value.
Temperature and Pressure Input Ratings
Number of Channels:
2
Loop
Voltage
Source:
Internal
Input Impedance:
Switch Dependant
Configuration menu (Items Affected)
1. None