Woodward GCP-30 Series - Measuring Inputs; Voltage; Figure 5-2: Measuring Inputs - Voltage - Generator; Table 5-3: Terminal Assignment

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Manual 37364A GCP-30 Packages - Genset Control

Measuring Inputs

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Voltage

Generator

Generator voltage

MCB GCB

20 21 22

Figure 5-2: Measuring inputs - Voltage - Generator

Terminal Measurement Description A

max

400 Vac or

../100 Vac

Generator voltage L1 2.5 mm²

21 Generator voltage L2 2.5 mm²

22 Generator voltage L3 2.5 mm²

0 Neutral point of the 3-phase wye system/transformer 2.5 mm²

Table 5-3: Terminal assignment - generator voltage measuring

NOTE

A GCP-30 controller with 400V PT inputs and potential transformers with 100V secondary outputs must

be used for 480V delta applications. The GCP-30 will not properly protect the generator or system from

overvoltage fault conditions if a GCP-30 with 100V PT inputs is used with 100V potential transformers

or a 400V PT input unit is directly connected to a 480V system. The 100V model inputs are limited to

measuring voltage up to 125V and an overvoltage fault would exceed this range. The 400V model of the

GCP-30 is also unable to monitor for overvoltage faults if potential transformers are not utilized due to

the overvoltage fault exceeding the voltage monitoring range of maximum 500V as well.

NOTE

If a three-wire system is connected, terminal 0 must remain disconnected. If terminal 0 is connected,

the control may monitor a voltage that exceeds the permissible limits.

Woodward GCP-30 Series - Measuring Inputs; Voltage; Figure 5-2: Measuring Inputs - Voltage - Generator; Table 5-3: Terminal Assignment - Generator Voltage Measuring