Littelfuse T4400 Series User Manual download pdf

T4400 Load Sharer

• Automatic load sharing with voltage

based speed control

• Adaptable to most speed controllers

• 2-wire communication with other

T4400 Load Sharers

• Built-in frequency control

• Load / unload facility with ramp

function

• Reverse power and unloaded trip

• Visual indication of voltage, generator

C/B state and unload signal

• Cost effective and highly reliable

compact design

• 50 hours burn-in before ﬁnal test

• Operating temperature range:

-20°C to +70°C

• Flame retardant enclosure

• DIN rail or screw mounting

Application

The T4400 Load Sharer provides

automatic load sharing and frequency

control for parallel running generators.

The load sharing is proportional, meaning

that the generators will be loaded equal-

ly compared to their individual capacity.

The T4400 works in connection with

most electronic speed controllers.

The load on each generator is compared

with the load on the other generators

and corrected until balance is obtained.

Load sharing is necessary after

synchronization in order to re-establish

load balance and to obtain long term

stability of load and system frequency.

When applied with the B9300 Power

Reference Unit, one or several generators

can be operated in parallel with the grid

(utility).

Together with the T4000 Auto Synchro-

nizer, the T4400 provides the optimal

solution for generator control, both in

land and marine-based applications.

The T4900 VAr-Load Sharer can be used

as a supplement. The combination of

the T4400 and the T4900 will provide

complete load sharing of both active

load and reactive load.

Function

The input to the T4400 is the voltage

and current, from which the active load

and frequency are determined.

The T4400 calculates I x cos f, represen-

ting the active load. The load on each

generator is compared with the load on

the other generators and calculated into

a control signal that is connected to the

electronic speed controller for regulating

the load with optimal speed and

stability.

The T4400 includes a built-in frequency

control and an integration function.

These two features provide a very high

overall stability and compensate for any

drift within the speed controller.

A soft load / unload function is also

provided. When activated, the T4400

will slowly increase or decrease speed to

transfer load to or from the generator. A

built-in relay can automatically trip the

circuit breaker when the unload

procedure is completed.

The T4400 has a built-in reverse power

protection with selectable limits and

time delays.

Fig. 1 shows how to connect to most

Woodward and Heinzmann speed

controllers. For connection to other

makes please refer to the section

“Interfacing” on the following page.

Fig. 1. Application diagram for T4400 and speed controller with -5V to +5V DC input.

Soft load

or unload

Sync.

T4400

1 2 3 4

Summary of Contents

Page 1 - T4400 Load Sharer

T4400 Load Sharer• Automatic load sharing with voltage based speed control• Adaptable to most speed controllers• 2-wire communication with other T4400

Page 2 - Trouble Shooting

Supply voltage / currentThe supply voltage from L1 and L2 is connected to terminals 1 and 3 or 2 and 3, depending on the system voltage.The measuring

Page 3 - LOAD SHARER

Fig. 3. Application Diagram. Synchronization and load sharing with the T4000, T4400 and a speed controller with -5V to +5V DC input.2. Output from te

Page 4 - Speciﬁcations

T4495-62ESpeciﬁcationsT4400 Load SharerMax voltage 660VVoltage range 70 - 110%Consumption Voltage 4VA at UN Current 0.4VA at INContinuous current

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Littelfuse T4400 Series User Manual

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