Generator Control
© 2015 Littelfuse Protection Relays & Controls
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
FEATURES BENEFITS
Adjustable delta frequency,
synchronizing window
(delta voltage), & breaker
make time by front panel
potentiometers & terminal
bridging resistors
Facilitates adjustment during installation and
commissioning
Inputs for disabling internal
frequency control
Enables synchronization to external frequency
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 &
voltage increase/decrease
signals
Provides quick and concise status information
Direct line-line voltage
Supply (up to 690 Vac)
Simplifies design and installation. No need for
PTs or separate power supply
Galvanic isolated inputs
Protects the unit against high AC voltage and
currents from the installation including spikes
DIN rail or screw-mount
Easy installation
Features & Benefits
Other supply voltages and combinations are available on request.
Specifications
Max. Voltage 660 V
Voltage Range 70-110%
Consumption 4 VA at U
N
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 150 mm (5.9“);
D 115 mm (4.5“)
Installation 35 mm DIN rail or 4 mm (
3
/16”) screws
www.littelfuse.com/t4500
ORDERING NUMBER
TERMINALS
1-3
5-7
2-3
6-7
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
Ordering Information
BUS
BUS
C/B
SYNC.
ON
G
M
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
L
1
L
2
L
3
T4500
(Auto Synchronizer)
GEN
CLOSE INCR. DECR.
INCR. DECR.
VOLTAGE MATCHING
VOLT PROGRAMMING
DIS-
ABLE
COM FREQ
OUT
Rev: 4-B-111014
