Woodward EPG 524 Installation And Troubleshooting Manual page 9

Manual 82329
1. Shielded wires to be twisted pairs or twisted 3-conductor, grounded at one end only.
2. 4 or 2 mm² (12 or 14 AWG) stranded wire, must be as short as possible. Total of
distance from battery to control, and from control to actuator, to be as short as
possible (see maximum length in chart).
3. See EPG Models above for source voltages.
4. Open for minimum fuel. Do not use either the minimum fuel option, or disconnect the
actuator leads, or disconnect the power to the control as part of any emergency stop
sequence.
5. For positive ground systems, switch and fuse to be located in series with battery (–)
and terminal 2. Positive (+) terminal becomes chassis ground. Leads from battery to
terminals 1 and 2 must be direct and not pass through distribution points.
6. Approximate speed change with trim potentiometer:
±2.5% using a 1 kΩ potentiometer
±5% using a 2 kΩ potentiometer
7. About one second ramp time per 50 µF. Capacitor specification: 200 µF maximum,
15 W minimum, less than 30 µAdc leakage current over temperature range.
8. Idle range about 25% to 200% of rated, using 50 k potentiometer. For fixed idle,
calculate the value of the resistor:
9. 512/24 and 1712/24 use a 10 A fuse.
10. Polarity not important.
11. With a balanced load and unity power factor (PF=1), the current transformer should
be wired in the correct potential leg, and must be phased at the control so the
potential at terminal 9 to 10 is in phase with the CT from terminal 11 to 12.
12. Power source current transformers should be sized to produce a 5 A secondary
current, with maximum generator current. CT burden is essentially 0 VA.
13. Absolute minimum signal must be 95 Vrms. Absolute maximum signal must be 260
Vrms. Potential transformer burden is 20 VA.
14. This control contains an internal current transformer. This transformer must be
connected across the power source transformer whenever the unit is running to
prevent lethal high voltage from developing on leads to these terminals.
15. On systems without a neutral, the voltage at terminal 9 to 10 is 1.73 times N2/N1
times the line-to-line voltage.
Maximum Wiring Length Chart
System
Voltage
12 V (512/1712)
24 V (524/1724)
Wire Harness Part Numbers
Harness
Part Number
8924-621
8924-620
Woodward
EPG Electrically Powered Governor
Wiring Diagram Notes
(
Rated Speed
R = 17 kΩ
Idle Speed
Maximum Wire Length
2 mm² 4 mm²
(14 AWG) (12 AWG)
3 m (10 ft) 6 m (20 ft)
11 m (35 ft) 23 m (75 ft)
Harness Lengths
MPU Actuator
10 ft (3 m) 15 ft (4.6 m)
10 ft (3 m) 25 ft (7.6 m)
)
– 1
Battery
15 ft (4.6 m)
25 ft (7.6 m)
5