Year: 2025

DSLC-2 / MSLC-2 Systems

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The network addressing of the DSLC-2 / MSLC-2 allows up to 32 DSLC-2s and 16 MSLC-2s in an ap

plication. A DSLC-2 and MSLC-2 application can handle 8 segments. Discrete inputs inform the DSLC

2s and MSLC-2s which segments each generator and utilities are operating on. If a MSLC-2 receives a

discrete input to activate segment 1 and 2. it will share this information with all controls over the Ether

net bus. It is not necessary to provide a segment activation discrete input to all controls. Segmenting

allows the DSLC-2s and MSLC-2s to remain connected thru the Ethernet bus, but be operating on sep

arate load buses.

The DSLC-2 / MSLC-2 system can be applied according to following rules:

• The maximum number of DSLC-2s (Gen-CB) is 32.

• The maximum number of MSLC-2s (Utility- or Tie-CB) is 16.

• The maximum number of segments is 8.

• The segment numbers have to follow a line, which can finally be closed to a ring.

• For DSLC-2 it can be selected between two segmenting modes:

o Bus segmenting determining generators running together via an algorithm.

The DSLC-2 / MSLC-2 system can be applied according to following rules:

• The maximum number of DSLC-2s (Gen-CB) is 32.

• The maximum number of MSLC-2s (Utility- or Tie-CB) is 16.

• The maximum number of segments is 8.

• The segment numbers have to follow a line, which can finally be closed to a ring.

• For DSLC-2 it can be selected between two segmenting modes:

o Bus segmenting determining generators running together via an algorithm.

o Device segmenting determining generators running together from outside.

• Only one MSLC-2 can be used as master control, when multiple MSLC-2 is resided in one segment.

o The MSLC-2 with the lower device number will control if multiple Utility MSLC-2s are

active on the same segment

• The generator is not counted as a segment.

• The utility is not counted as a segment.

Var/PF Control

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The var/PF function controls the power factor on all of the DSLC-2 equipped machines operating in

isochronous load sharing. The PF control begins on breaker closure. The MSLC-2 has three modes of

Var/PF control (which are selected in Menu 4):

• Constant generator power factor – sets the power factor reference on all of the DSLC-2 con

trols to the internal reference chosen in the MSLC-2. The power factor can then be adjusted

using the voltage raise and lower inputs. The voltage raise command will make the power fac

tor more lagging. Conversely, the voltage lower command will make the power factor more leading.

• Utility tie power factor control – adjusts the power factor reference on all of the DSLC-2 con

trols in isochronous load sharing in order to maintain the power factor across the utility tie.

• Utility tie var control – adjusts the power factor reference on all of the DSLC-2 controls in

isochronous load sharing in order to maintain the level of vars being imported or exported from the

utility.

The var/PF control mode begins with the load control mode selected. The constant generator power

factor and the utility tie power factor control can have the reference setting controlled by an analog in

put (see Menu 6). By closing the voltage raise and lower discrete inputs, you can select the analog re

mote input for reference control.

The MSLC-2 is not capable of overloading or reverse powering the generators in an attempt to meet

the process reference. The high and low limit switches mentioned above can be used to indicate that

either too many or too few generators are online to maintain the process within its limits.

A process controller is provided for cogeneration, fluid level maintenance, pressure control or other ap

plications. An adjustable bandwidth signal input filter, flexible PID controller adjustments, selectable for

direct or indirect action, allow the process control to be used in a wide variety of applications.

An analog signal input (signal variety: 0 to 20mA, 4 to 20mA, 0 to 5V, 1 to 5V and 0 to 10V) provides

the process signal to the MSLC-2. The MSLC-2 includes an internal digital process reference, which

may be controlled by the raise and lower switch contact inputs or by an external analog input signal as

remote process reference. The MSLC-2 also has a Modbus address for process reference control. The

output of the process control, like the import/export control, is the percentage of rated load setpoint to

the individual generators in isochronous load sharing.

Process Control

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A process controller is provided for cogeneration, fluid level maintenance, pressure control or other ap

plications. An adjustable bandwidth signal input filter, flexible PID controller adjustments, selectable for

direct or indirect action, allow the process control to be used in a wide variety of applications.

An analog signal input (signal variety: 0 to 20mA, 4 to 20mA, 0 to 5V, 1 to 5V and 0 to 10V) provides

the process signal to the MSLC-2. The MSLC-2 includes an internal digital process reference, which

may be controlled by the raise and lower switch contact inputs or by an external analog input signal as

remote process reference. The MSLC-2 also has a Modbus address for process reference control. The

output of the process control, like the import/export control, is the percentage of rated load setpoint to

the individual generators in isochronous load sharing.

An adjustable ramp allows smooth entry and exit from the process control mode. When the process

control mode is selected, the load reference is ramped in a direction to reduce the error between the

process input and the process reference. When the error is minimized or the reference first reaches

either the high or the low specified limits, the process controllers PID loop is activated. When the load

reference output reaches either 100% or 0%, the control will maintain that load reference until process

control is established.