Diesel Generator Operation Manual Control System Part 12 Power Transfer Main Menu

 Diesel Generator Operation Manual Control System Part 12 

Power Transfer Main Menu

If  you  press  the Power  Trans  button in Menu A, the Power Transfer main menu will appear   (Figure 12-1).

Note:   The Power Transfer Control (PTC) feature must be enabled to display this menu.

The PTC feature enables the PCC3201 to monitor the utility voltage (mains) and frequency for failure, and control the opening and closing of the contacts (circuit breakers) for the utility (S1) and the generator set (S2).

If utility fails, the control will initiate the starting sequence (Figure 5–1), open S1 and close S2 to the load. When utility returns, the load is retransferred to the utility (S1 closes and S2 opens) and the control initiates the generator set shutdown sequence.

Thesymbol displayed in the middle of the Power Transfer main menu indicates which breaker (utility or generator set) is closed/opened to the load. The symbol shown in

Figure 12-1 indicates that the utility breaker is closed and supplying power to the load.

The Power Transfer main menu also indicates if the utility and the generator set are available to accept load. When the control detects that either source is ready to accept load, Utility and/or Genset will be displayed in inverse video.

The Power Transfer main menu has four submenu groups:

•Utility

•Status

•Transfer Control

•Genset

To view system data, simply press the appropriate menu button to select the category. After pressing the desired menu button, refer to the following pages for detailed information related to the selected category.

Figure 12-1Power Transfer Main Menu

12.1PTC Status Line

The top line of the graphical display is used to indicate the following PTC status:

•NOT ENABLED: PTC is not enabled. Control panel switch in O (Off) position.

•MANUAL: Control panel switch is in Manual position. All PTC actions or generator set start/stop actions are manually controlled.

•NORMAL UTIL: Load is connected to the utility.

•RETRAN: Retransfer of load to utility.

•RETRAN OVRD: Immediate retransfer of load to utility due to generator set fault (e.g., warning, derate, or shutdown with cooldown fault). The retransfer timer is ignored as is the retransfer inhibit.

•EMERG TEST: Emergency Test sequence initiated through Remote Start switch with emergency start sequence enabled (TB8–3 terminal opened). Emergency test mode means that the generator set will continue to run even if a generator set warning or derate fault occurs. This test can be performed with or without load (refer to Section 5.9). See Table 5–3 for sequence of operation.

•TEST: Test sequence initiated through Remote Start switch with emergency start sequence disabled (TB8–3 terminal closed). Test mode is non–emergency, which means that a retransfer to utility will occur if any problems occur with the generator set while testing with load. This test can be performed with or without load (refer to Section 5.9). See Table 5–3 for sequence of operation.

•EXERCISE: Exercise sequence initiated through control panel. This test can be performed with or without load (refer to Section 5.9). A retransfer to utility will occur if any problems  occur with the generator set during the exercise sequence. See Table 5–3 for sequence of operation.

•UTILITY FAIL: Utility has failed. (Initiates transfer of load to generator set if Off/Manual/Auto switch is in Auto.)

12.2Utility (PWR TRAN) Submenus

If the Utility button in the Power Transfer Main menu is pressed, the Utility submenu will appear (Figure 12-2).

•Voltage L–L and L–N: Indicates utility voltage Line–to–Line and Line–to–Neutral. Note that the Line–to–Neutral column will not be displayed for a 3 phase/3 wire system. Accuracy 1%. The voltage Line–to–Line (L1, L2 and L3) are measured between L1 to L2, L2 to L3 and L3 to L1, respectively.

•Amps: L2 only. Accuracy 1%.

•Frequency: Utility frequency.

•kW, kVA and PF: Displays (L2 only) utility kW and kVA output (average and direction of flow) and power factor with leading/lagging indication. Accuracy 5%.

Note:   The PFreading will contain an asterisk if the power factor is leading (for example, *.30).

Figure 12-2Utility Sub-menu

12.3Status (PWR TRAN) Submenus

If the Status button in the Power Transfer Main menu is pressed, the Status submenus will appear (Figure 4–15).

•Connected: Indicates which source(s) is connected to the load.

•Available: Indicates when the corresponding sources have acceptable output voltage and frequency. Both can be available simultaneously.

•Volt L12: Indicates utility and generator set Line 1 to Line 2 voltage.

•HZ: Utility and generator set output frequency.

•KW L2: Utility and generator set Phase B (L2) kW output.

•Transfer Inhibit: This feature is used to control load transfer to the generator set. When activated, load transfer to the generator set will not take place if the utility fails.

Transfer inhibit is controlled by connecting a remote contact between TB3–57 and TB3–58. Closing the contact enables the feature and opening the contact disables it. When enabled, the event is displayed on the graphical display.

•Retransfer Inhibit: This feature is used to prevent the PTC from automatically transferring the load back to the utility. When activated, load transfer will not take place unless the generator set fails (Retransfer Inhibit is ignored if the generator set fails).

Retransfer inhibit is controlled by connecting a remote contact between TB3–64 and TB3–65. Closing the contact enables the feature and opening the contact disables it. When enabled, the event is displayed on the graphical display.

Figure 12-3Status (PWR TRANS) Submenus

12.4Transfer Control (PWR TRAN) Submenu

If the Transfer Control button in the Power Transfer Main menu is pressed, the Transfer Control submenu will appear (Figure12-4).

The symbol displayed in the middle of the Transfer Control submenu indicates which breaker (utility or generator set) is closed/opened to the load. The symbol shown in Figure 4-16 indicates that the utility breaker is closed and supplying power to the load.

During generator set operation in the manual mode, you can manually transfer/retransfer load between the utility and the generator set. To transfer load, press the appropriate CB Enable button (Utility or Genset).

Example (Figure12-4)

In the example in Figure 12-4, the CB Enable button for Utility was pressed. (If the CB Enable button for the generator set was pressed, Enable Gen CB would be displayed in the second submenu, allowing you to open or close the generator set circuit breaker.)

After pressing the Utility CB Enable button, the second submenu will be displayed allowing you to either Cancel or Enable the entered selection.

Pressing the Cancel button will return the display to the previous menu.

Pressing the Enable button will display the third submenu. With this submenu displayed you can return to the second submenu without opening the utility circuit breaker (press <<Back) or you can press the Open Util button.

Pressing the Open Util button will display the fourth submenu, indicating that the utility circuit breaker is now opened.

Note that the fourth submenu displays Close Util. Pressing this button will close the utility circuit breaker and redisplay the third submenu.

Figure 12-4Transfer Control Submenus

12.5Generator Set (PWR TRAN) Submenus

If the Genset button in the Power Transfer Main menu is pressed, the Genset submenus will appear (Figure 12-5).

•Voltage L–L and L–N: Indicates voltage Line–to–Line and Line–to–Neutral. Accuracy 1%. The voltage Line–to–Line (L1, L2 and L3) is measured between L1 to L2, L2 to L3 and L3 to L1, respectively.

Note:   Note that the Line–to–Neutral column will not be displayed for a 3 phase/3 wire system.

•Amps: All phases. Accuracy 1%.

•Frequency: Generator set output frequency.

•kW, kVA and PF: Displays generator set kW and kVA output (average and individual phase, and direction of flow) and power factor with leading/lagging indication. Accuracy 5%.

Note:   The PFreading will contain an asterisk if the powerfactor is leading (for example, *.30).

Figure 4-17Genset Submenus