This menu contains the adjustments for load control.
Figure 3-13: ToolKit – load control
PID Import/Export Control
ID Parameter CL Setting range Default Description
5510 Import/
export control proportional gain
2 0.01 to 100.00 1.00 Import/export control proportional gain determines how fast the
load control responds to an import/export load error. Gain is set to provide stable control. Lower the value for slower response.
5511 Import/
export control integral gain
2 0.01 to 100.00 0.50 Import/export control integral gain compensates for lags in the
load control loop. It prevents slow hunting and controls damping (overshoot or undershoot) after a load disturbance. Lower the val- ue for slower response.
5512 Import/
export control derivative ratio
2 0.01 to 100.00 0.01 Import/export control derivative ratio adjusts the rate of change in
Power Control Monitoring
ID Parameter CL Setting range Default Description
7504 High load
limit alarm
2 Disabled / Enabled
Disabled The High load limit alarm specifies if the high load limit alarm will activate (energize) the “High Limit” relay (Terminal 44).
4709 High load
limit PU
2 -150 to 150 % 100 % The High load limit PU is the import/export load level where (if enabled) the “High Limit” relay is energized and the high limit alarm is activated. The percentage value relates to system A rated load (parameter 1752).
4526 High load
limit DO
2 -150 to 150 % 90 % The High load limit DO is the import/export load level where (if enabled) the “High Limit” relay is de-energized and the high limit alarm is deactivated. The percentage value relates to system A rated load (parameter 1752).
7505 Low load
limit alarm
2 Disabled / Enabled
Disabled The Low load limit alarm specifies if the low load limit alarm will activate (energize) the “Low Limit” relay (Terminal 45).
4710 Low load
limit PU
2 0 to 100 % 0 % The Low load limit PU is the import/export load level where (if enabled) the “Low Limit” relay is energized and the low limit alarm is activated. The percentage value relates to system A rated load (parameter 1752).
4528 Low load
limit DO
2 -2 to 150 % 5 % The Low load limit DO is the import/export load level where (if enabled) the “Low Limit” relay is de-energized and the low limit alarm is deactivated. The percentage value relates to system A rated load (parameter 1752).
7506 Load limit
switch
2 Disabled / Enabled
Disabled Load limit switch specifies if the “High Limit” and “Low Limit” re- lays will activate on high or low limit alarm.
7616 Gen load
high limit alarm
2 Disabled / Enabled
Disabled Generator load high limit alarm specifies if the generator high load limit alarm will activate the “High Limit” relay (Terminal 44). The generator high limit alarm is activated when the MSLC-2 is required to output a system load of 100% to the DSLC-2 controls in order to meet its reference.
NOTE: The “Alarm” relay includes additional the self-test function. Alarm active means relay open.
7617 Gen load low
limit alarm
2 Disabled / Enabled
Disabled Generator load low limit alarm specifies if the generator low load limit alarm will activate the “Low Limit” relay (Terminal 45). The generator low limit alarm is caused when the MSLC-2 is re- quired to output a system load of 0% to the DSLC-2 controls in order to meet its reference.
7618 Gen load
limit switch
2 Disabled / Enabled
Disabled Generator load limit switch specifies if the high and low limit alarms will activate the “Load Switch 1” or “Load Switch 2” relay when the system load setpoint reaches 100% or respectively 0%. 4529 Gen Load
switch 1 PU
2 0 to 100 % 0 % Generator Load switch 1 PU is the system load level where the
“Load Switch1” relay is energized. 4530 Gen Load
switch 1 DO
2 0 to 100 % 10 % Generator Load switch 1 DO is the system load level where the
“Load Switch1” relay is de-energized. 4538 Gen Load
switch 2 PU
2 0 to 100 % 100 % Generator Load switch 2 PU is the system load level where the
“Load Switch2” relay is energized. 4543 Gen Load
switch 2 DO
2 0 to 100 % 90 % Generator Load switch 2 DO is the system load level where the
Power Control
ID Parameter CL Setting range Default Description
1752 System A
rated load
2 1 to 999999.9 kW
200.0 kW This value specifies a rated power at the interchange point or over the tie-breaker. This real power rating is the reference for several functions, like power control monitoring or ramp scaling.
NOTE: During active power control, the System A rated load val- ue (parameter 1752) may not be changed. The power plant has to be shut down and the MCB has to be opened.
7717 Import /
export level
0 -999999.9 to 999999.9 kW
20.0 kW This value is the load setpoint for the import export control. The value gets active when the load control setpoint source (parame- ter 7634) is configured for “Internal”.
Note: This value is bypassed in the moment of using the raise / lower setpoint function by DI. The value is triggered, if the “CB Aux” goes open and close or another load setting is configured.
3125 Generator
unload trip
2 0.5 to 99.9 % 3.0 % Generator unload trip is the percentage limit of the system load
level sent to the DSLC-2s, which must be reached before issuing the local/gen bus breaker open command.
NOTE: The local/gen bus unload mode will be activated, if the “Load Lower” DI is given continuously while in the base load con- trol mode.
4506 Utility unload
trip
2 0 to 30000 kW 5 kW Utility unload trip is the load level that the MSLC-2 must be below
before issuing the utility breaker open command during a utility unload.
3123 Utility unload
trip time
2 3 to 999 s 60 s If the monitored system A power does not fall below the limit con- figured in parameter 3125 before the time configured here ex- pires, a "Breaker open" command will be issued together with an alarm.
4524 Unload ramp
rate
2 0.01 to 100.00 %s
3.00 %/s Unload ramp rate is the rate at which the control ramps between modes in %/sec. Remember, this refers to unloading the utility, which is then loading the generator set.
4700 Load ramp
rate
2 0.01 to 100.00 %s
3.00 %/s Load ramp rate is the rate at which the control ramps between modes in %/sec. Remember, this refers to loading the utility, which is then unloading the generator set.
4515 Raise load
rate
2 0.01 to 100.00 %ss
1.00 %/s This is the rate the internal load reference increases, when the discrete input raise load command is activated.
NOTE: Modbus reference changes will follow this value.
4516 Lower load
rate
2 0.01 to 100.00 %s
1.00 %/s This is the rate the internal load reference decreases, when the discrete input lower load command is activated.
NOTE: Modbus reference changes will follow this value.
4523 Import / ex-
port droop
2 0.0 to 100.0 % 0.0 % Import / export droop is the droop setting for the import/export
controller. The effect of droop is to make the control more resis- tant to variations from the import/export reference. This droop has the effect of causing the target import/export level to go towards a zero power transfer situation with increasing load. When set to the default value of zero the import/export control has no droop. 7634 Load control
setpoint source
2 Internal / Interface
Internal This setting determines from which source the load reference for the import / export power control comes:
Internal: The setpoint parameter 7717 is valid or the analog input.
The analog remote load reference input is valid, when DI “Load Raise” and DI “Load Lower” are closed.
ID Parameter CL Setting range Default Description
7755 Interface
switch import export
2 Export / Import Export This setting defines the setpoint argument for the power control setpoint transferred by interface. This setting gets active when the
Load control setpoint source (parameter 7634) is configured to
“Interface”.
Export: The value send by interface is an export kW setpoint. Import: The value send by interface is an import kW setpoint.