When a start signal input for base load operation is received the unit will perform the following functions:
- Automatic start
- Attain the rated speed.
- Attain the rated voltage.
- Synchronize the genset with the bus.
- Close the generator circuit breaker.
The start signal input for the base load operation is provided locally or the start signal input is provided remotely by the customer. This is done by establishing continuity between the "BASE LOAD START" contacts.
Once the genset is operating in parallel with the utility, the generator output will gradually increase up to the base load setting on the touchscreen display. Generator output will remain at the base load level until the generator receives a signal to shutdown. When the load control receives a signal for base load shutdown the load control will gradually decrease the generator output. The signal for base load shutdown is provided locally or the signal is provided remotely by establishing continuity between the "BASE LOAD STOP" contacts. The control will open the generator circuit breaker when the unload setpoint is reached. The engine will run without a load for the cooldown period. The engine will automatically shut down.
The parameters that are adjustable in the field include these items:
- Load time
- Unload time
- Base load level
The base load mode is disabled when the control is operating in the standby mode of operation.
Perform these steps in order to prepare for base load operation:
- Ensure that all of the generator and protective relay targets are reset. Ensure that the emergency stop switches are reset.
- Ensure that the circuit breaker "UTILITY AUX CONTACT" for the remote utility circuit has been connected. When the remote contact for the utility auxiliary is not available place a jumper wire between the contacts at the "UTILITY AUX CONTACT". These contact points are located in the auxiliary switchgear cabinet.
- Ensure that the circuit breaker for the remote utility is closed. The closed light for the utility circuit breaker should be illuminated. The touchscreen display should display a closed switch.
- Ensure that both the generator and the utility are of the same phase rotation, operating voltage and frequency.
- When a signal for automatic starting is received or a signal for remote starting is received the processor will start base load operation. When the utility circuit breaker is open and the terminal connections at the "UTILITY AUX CONTACT" are not electrically connected, the genset will automatically operate in the standby mode when an automatic start or remote start signal is initiated or received.
Note: See the schematic for additional information on customer connections.
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| Illustration 1 | g00853858 |
"MAIN" Screen (1) Icon for the genset (2) Indicator for the state of the system (3) generator bus (4) Generator circuit breaker (5) Button for "START LOAD" (6) Button for "STOP UNLOAD" (7) Indicator for the mode of the system (8) Indicator for remote start enable (9) Setpoint for base load operation (10) Indicator for the position of the engine control switch (ECS) (11) Indicator for local mode or remote mode (12) Indicator for the status of the utility circuit breaker (13) Indicator for the status of the generator multifunction relay (GMR) (14) Indicator for the "UTTR TRIP" (15) Utility bus (16) Indicator for the status of the utility multifunction relay (UMR) (17) Button for the "MAIN" screen | |
Local Start for Base Load Operation
Place the controls in the following positions:
| CONTROL | POSITION/SELECTION | ACTION |
| "DROOP-ISOCHRONOUS" switch | "ISOCHRONOUS" | Engine speed does not drop when a load is applied. |
| "IDLE"/"RATED" switch | "RATED" | Moves engine from "IDLE" speed to "RATED" speed. |
| Circuit breaker switch | NAC (1) | This enables the generator circuit breaker to be closed. |
| Lockout relay | "RESET" | Removes the disabling (lockout) voltage from the switchgear. |
| "LOCAL"/"REMOTE" setpoint | "LOCAL" | Enables local start and local stop from the "MAIN" screen of the touchscreen display. |
| "START/LOAD" on the "MAIN" screen | "START/LOAD" | Starts the engine. Closes the generator circuit breaker. (2) |
| "STOP/UNLOAD" on the "MAIN" screen | Not used | None |
| "SYNCHRONIZING" switch | Not used | None |
| Engine control switch | "AUTO" | Puts the switchgear in automatic mode. |
| Alarm switch | Not used | None |
| Manual load potentiometer | Not used | None |
| VAR/Power factor adjust potentiometer | Used | Adjust as needed in order to regulate the power factor of the genset. |
| "BASE LOAD START" (Remote) | No contact | None |
| "BASE LOAD STOP" (Remote) | No contact | None |
| "STANDBY START" (Remote) | No contact | None |
| "STANDBY STOP" (Remote) | No contact | None |
| ( 1 ) | Turn the handle of the circuit breaker switch to the fully clockwise position. Release the handle. The handle will return to the center position. The red target will be visible. |
| ( 2 ) | The generator circuit breaker will close automatically when all of the permissives have been met. The power module will begin to soft load against the utility. This process will stop when the setpoint for base load operation is reached. |
Touch the button for "START LOAD" (5) on the "MAIN" screen of the touchscreen display.
The genset will perform the following operations:
- Start the engine.
- Adjust the engine to the rated speed.
- Adjust to the rated voltage.
- Synchronize the phase rotation with the bus.
- Close the generator circuit breaker.
When the generator is paralleled with the utility, the generator output will be increased to the base load setting of the touchscreen display. The generator output will remain at the base load setting until the unit receives a shutdown signal or the base load setting is changed.
Local Stop for Base Load Operation
Place the controls in the following positions:
| CONTROL | POSITION/SELECTION | ACTION |
| "DROOP-ISOCHRONOUS" switch | "ISOCHRONOUS" | Engine speed does not drop when a load is applied. |
| "IDLE"/"RATED" switch | "RATED" | Moves engine from "IDLE" speed to "RATED" speed. |
| Circuit breaker switch | "TRIP" | This causes the generator circuit breaker to close. |
| Lockout relay | "RESET" | Removes the disabling (lockout) voltage from the switchgear. |
| "LOCAL"/"REMOTE" setpoint | "LOCAL" | Enables local start/stop on the "MAIN" screen of the touchscreen display. |
| "START/LOAD" on the "MAIN" screen | Not used | None |
| "STOP/UNLOAD" on the "MAIN" screen | "STOP/UNLOAD" | Opens the generator circuit breaker. Places the engine in cooldown mode. (2) |
| "SYNCHRONIZING" switch | Not used | None |
| Engine control switch | "AUTO" | Puts the switchgear in the automatic mode. |
| Alarm switch | Not used | None |
| Manual load potentiometer | Not used | None |
| VAR/Power factor adjust potentiometer | Used | Adjust as needed in order to regulate the power factor of the genset. |
| "BASE LOAD START" (Remote) | No contact | None |
| "BASE LOAD STOP" (Remote) | No contact | None |
| "STANDBY START" (Remote) | No contact | None |
| "STANDBY STOP" (Remote) | No contact | None |
| ( 2 ) | The power module will soft unload until the output reaches the unload setpoint. The generator circuit breaker will open. The power module will go into cooldown mode. |
Momentarily touch the button for "STOP UNLOAD" (6) on the "MAIN" screen of the touchscreen display. The load control will gradually decrease the generator output. The load control will then trip the generator circuit breaker. This occurs when the unload setpoint is reached. The engine will run without a load for the cooldown period. The engine will automatically shut down.
Remote Start for Base Load Operation
Place the controls in the following positions:
| CONTROL | POSITION/SELECTION | ACTION |
| "DROOP-ISOCHRONOUS" switch | "ISOCHRONOUS" | Engine speed does not drop when a load is applied. |
| "IDLE"/"RATED" switch | "RATED" | Moves engine from "IDLE" speed to "RATED" speed. |
| Circuit breaker switch | NAC (1) | This enables the generator circuit breaker to be closed. |
| Lockout relay | "RESET" | Removes the disabling (lockout) voltage from the switchgear. |
| "LOCAL"/"REMOTE" setpoint | "REMOTE" | Disables local start/stop on the "MAIN" screen of the touchscreen display. |
| "START/LOAD" on the "MAIN" screen | Not used | None |
| "STOP/UNLOAD" on the "MAIN" screen | Not used | None |
| "SYNCHRONIZING" switch | Not used | None |
| Engine control switch | "AUTO" | Puts the switchgear in the automatic mode. |
| Alarm switch | Not used | None |
| Manual load potentiometer | Not used | None |
| VAR/Power factor adjust potentiometer | Used | Adjust as needed in order to adjust the power factor of the genset. |
| "BASE LOAD START" (Remote) | A contact is applied | The engine starts. The generator circuit breaker closes. (2) |
| "BASE LOAD STOP" (Remote) | No contact | None |
| "STANDBY START" (Remote) | No contact | None |
| "STANDBY STOP" (Remote) | No contact | None |
| ( 1 ) | Turn the handle of the circuit breaker switch to the fully clockwise position. Release the handle. The handle will return to the center position. The red target will be visible. |
| ( 2 ) | The generator circuit breaker will close automatically when all of the permissives have been met. The power module will begin to soft load against the utility. This process will stop when the setpoint for base load operation is reached. |
Wire the remote start contacts to the "BASE LOAD START" terminals. The remote contacts must close for a one second pulse.
The genset will perform these operations:
- Start the engine.
- Adjust the engine to the rated speed.
- Adjust to the rated voltage.
- Synchronize the phase rotation with the bus.
- Close the generator circuit breaker.
When the generator is paralleled with the utility, the generator output is gradually increased to the base load setting. The base load setting was previously set by using the touchscreen display. The generator output will remain at the base load level until the unit receives a shutdown signal.
Remote Stop for Base Load Operation
Place the controls in the following positions:
| CONTROL | POSITION/SELECTION | ACTION |
| "DROOP-ISOCHRONOUS" switch | "ISOCHRONOUS" | Engine speed does not drop when a load is applied. |
| "IDLE"/"RATED" switch | "RATED" | Moves the engine from "IDLE" speed to "RATED" speed. |
| Circuit breaker switch | "TRIP" | This causes the generator circuit breaker to close. |
| Lockout relay | "RESET" | Removes the disabling (lockout) voltage from the switchgear. |
| "LOCAL"/"REMOTE" setpoint | "REMOTE" | Disables local start/stop on the "MAIN" screen of the touchscreen display. |
| "START/LOAD" on the "MAIN" screen | Not used | None |
| "STOP/UNLOAD" on the "MAIN" screen | Not used | None |
| "SYNCHRONIZING" switch | Not used | None |
| Engine control switch | "AUTO" | Puts the switchgear in the automatic mode. |
| Alarm switch | Not used | None |
| Manual load potentiometer | Not used | None |
| VAR/Power factor adjust potentiometer | Used | Adjust as needed in order to adjust the power factor of the genset. |
| "BASE LOAD START" (Remote) | No contact | None |
| "BASE LOAD STOP" (Remote) | A contact is applied. | Opens the generator circuit breaker. Places the engine in cooldown mode. (2) |
| "STANDBY START" (Remote) | No contact | None |
| "STANDBY STOP" (Remote) | No contact | None |
| ( 2 ) | The power module will soft unload until the output reaches the unload setpoint. The generator circuit breaker will open. The power module will go into cooldown mode. |
Wire the contacts for remote stop to the "BASE LOAD STOP" terminals. The contacts for remote stop must close for a one second pulse. The load control will gradually decrease generator output. The generator circuit breaker will trip open when the setpoint for generator unload is reached. The engine will run without a load for the cooldown period. The engine will shut down.