EGCP-2 Engine Generator Control Package Manual 26174
22 Woodward
Potential Transformer (PT) Inputs
Potential Transformers (PTs) are utilized with the EGCP-2 control to allow high
voltages to be stepped down to a safe level for the EGCP-2 input circuitry. The
EGCP-2 control senses generator output voltage through three Generator PTs,
and utility and plant-bus voltages via one shared utility/plant-bus PT.
Potential Transformer Input Ratings for 8406-120
Number of inputs: 4
Maximum Voltage Rating: 150–300 Vac
Burden: 0.45 VA
Input Frequency: 40–70 Hz
Potential Transformer Input Ratings for 8406-121
Number of inputs: 4
Maximum Voltage Rating: 50–150 Vac
Burden: 0.25 VA
Input Frequency: 40–70 Hz
Because the same EGCP-2 input is used to sense both the utility and
local bus voltages, the two PT signals must be identical in
configuration (Wye or Delta), phase (A-B or A-N), and amplitude for
correct input readings.
Generator PT Input Wiring
The EGCP-2 utilizes a 6-wire generator PT input configuration. This type of
configuration allows the EGCP-2 to be easily wired to either Delta or Wye
generators or transformers. The EGCP-2 control uses all three phases of the
generator to sense both real and reactive generator power. Refer to the Figure
3-5 for Delta based wiring diagrams and Figure 3-6 for Wye based wiring
diagrams. Once wired into a Delta or Wye circuit, the EGCP-2 must also be
programmed to sense the correct (Delta or Wye) configuration.
Configuration menu (items affected)
1. PT Ratio
2. Voltage Input
3. Voltage Ref
Shutdown and Alarms Menu
1. Gen Volt Hi Limit and Alarm
2. Gen Volt Lo Limit and Alarm
3. Gen Freq Hi Limit and Alarm
4. Gen Freq Lo Limit and Alarm
Transfer Switch Menu
1. Main Volt High Limit and Alarm
2. Main Volt Low Limit and Alarm
3. Main Freq High Limit and Alarm
4. Main Freq Low Limit and Alarm
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