Littelfuse T4500 User Manual

Generator Control

Basic

T4500 SERIES

Auto Synchronizer for Conventional Governors

Description

The T4500 Auto Synchronizer provides automatic
synchronization of a generator to a busbar in a minimum of
time, by controlling the speed via the electric servomotor
on a conventional speed governor, or by controlling an
electronic speed controller via an intermediate motorized
potentiometer. A unique feature of the T4500 is the
possibility of simultaneous synchronization of already
parallel running generators to another busbar section, a
shaft generator or the grid. The T4500 includes outputs for
controlling the Automatic Voltage Regulator (AVR) as well.
When used, T4500 will not only control the speed of the
generator, but also the alternator voltage (Voltage Matching).

Simplified Circuit Diagram

VOLT PROGRAMMING

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

T4500

(Auto Synchronizer)

DIS-

BUS

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

L

1

L

2

L

3

BUS

C/B

SYNC.

ON

GEN

CLOSE INCR. DECR.

G

ABLE

COM FREQ

OUT

Ordering Information

TERMINALS

ORDERING NUMBER

T4500.0010 450 V 400 V

T4500.0020 230 V

T4500.0030 480 V 415 V

T4500.0040 110 V 63 V

T4500.0050 127 V 120 V

T4500.0060 110 V 100 V

T4500.0070 600 V

Other supply voltages and combinations are available o n reques t.

1-3
5-7

2-3
6-7

VOLTAGE MATCHING

INCR. DECR.

M

Features & Benefits

FEATURES BENEFITS

Adjustable delta frequency,
synchronizing window
(delta voltage), & breaker
make time by front panel

Facilitates adjustment during installation and
commissioning

potentiometers & terminal
bridging resistors

Enables synchronization to external frequency

Inputs for disabling internal
frequency control

set-point from other busbar sections, shaft
generators or the main grid (grid-parallel
operation)

Automatic voltage
matching

Enables use in installations with fluctuating
system voltage

Visual indication of bus,
generator, & delta voltage,
closing signal, & speed &

Provides quick and concise status information

voltage increase/decrease
signals

Direct line-line voltage
Supply (up to 690 Vac)

Galvanic isolated inputs

DIN rail or screw-mount

Simplifies design and installation. No need for
PTs or separate power supply

Protects the unit against high AC voltage and
currents from the installation including spikes

Easy installation

Specifications

Max. Voltage 660 V
Voltage Range 70 -110%
Consumption 4 VA at U
Frequency Range 35 -70 Hz
Frequency Difference 0.1-1.0 Hz
C/B Make Time 20-200 ms
Voltage Difference 2-10 %
Contact Rating AC: 400 V, 2 A, 250 VA; DC: 110 V, 2 A, 100 W
Operating Temperature –20°C to +70°C
Vibration Test 4 g (500-100 Hz)
EMC CE according to EN50081-1, EN50082-1,

EN50081-2, EN50082-2

Approvals Certified by major marine classification societies
Burn-in 50 hours before final test
Enclosure Material Polycarbonate, flame retardant
Weight 0.7 kg
Dimensions H 70 mm (2.7“); W 100 mm (3.9“);
D 115 mm (4.5“)
Installation 35 mm DIN rail or 4 mm (

N

3

/16”) screws

© 2013 Littelfuse Protection Relays & Controls
www.littelfuse.com/t4500

Rev: 4-A-050313