Littelfuse T4000 Series - Manual

T4000 Auto Synchronizer
• Automatic synchronization with
voltage based speed control
• Adjustable stability and phase angle.
• Visual indication of bus voltage,
generator voltage and closing signal
• Output adaptable to most electronic
speed controllers
• Automatic or remote reset of output
• Cost effective and highly reliable
compact design
• 50 hours burn-in before final test
• Operating temperature range:
-20°C to +70°C
• Certified by major marine
classification societies
• Flame retardant enclosure
• Screw or DIN rail mounting
Application
The T4000 Auto Synchronizer provides
automatic synchronization of an
incoming generator to a busbar in a
minimum of time.
The T4000 operates in connection with
most electronic speed controllers. Via the
speed controller the T4000 controls the
speed and phase of the generator in order
to match it to the busbar. The T4000 will
lock the phase and frequency once accor-
dance is obtained, thus enabling the
generator to stay in synchronisation with
the bus bar without closing the breaker.
Together with the T4400 Load Sharer,
the T4000 provides the optimal solution
for generator control, both in marine
and land-based applications. The T4000
is type approved by major marine
classification societies.
Function
The T4000 measures the voltage across
two phases on either side of the circuit
breaker in order to obtain data on frequency,
phase and voltage difference for closing
the circuit breaker at phase accordance.
The limits for the closing signal are
adjustable on the dial PHASE ANGLE.
The phase can be adjusted between ±6°
and ±9°, and voltage difference between
±10 % and ±15%. When the difference
in voltage, phase and frequency are
within limit for 0.5 seconds, a closing
signal to the circuit breaker is generated,
provided that CLOSE ENABLE is activa-
ted (terminals 12 and 13 interconnected).
The relay LED indicates when within
limits and a jumper between terminals
12 and 13 (CLOSE ENABLE) will enable
the closing contact CLOSE (terminals 9
and 10). The closing signal is maintained
for a minimum duration of 0.5 seconds.
When commissioning, it is recommended to
disconnect the closing signal by opening
the jumper between terminals 12 and 13.
Check that the closing signal indicated on
the relay LED is at phase accordance.
The DC control signal to the speed
controller must be reset when the circuit
breaker is closed. A jumper between
terminals 12 and 15 (AUTO RESET)
gives delayed automatic reset.
Alternatively a normally closed auxiliary
circuit breaker contact, connected to
terminals 12 and 14 (OPEN TO RESET),
gives remote reset when the contact is
opened. Reset is also obtained if the bus
or generator voltage drops below
approximately 50% of nominal voltage.
Impedance adaption of the output
(OUTPUT TO GOV.) to individual
electronic speed controllers can be done
using terminals 23 to 26. Output on
terminal 22 is variable (adjustable by a
screwdriver at VARIABLE OUT 22).
Alternatively, other impedance values can
be obtained by connecting an external
resistor between terminals 21 and 27.
The resistance is selected so that a speed
deviation range of ±3 Hz is possible.
The stability is adjusted on the dial
STABILITY for the fastest phase accor-
dance which does not cause overshoot.
Fig. 1. Application Diagram.
GEN.
24
8
OUTPUT TO GOV.
AUTO-SYNCHRONIZER
BUS. GEN.
C/B
1
BUS
3 L
2 L
1
L
2 3
SYNC.
ON
4 5 7 6
ANGLE
PHASE
17 18 19
FORV. INV.
BUS.
23 20 21 22
COMM.
CONT.
GEN.
STABILITY
CLOSE ENABLE
Application diagram
C/B NC
9 10 11 12 15 14 13 16
AUTO RESET
OPEN TO RESET
25 28 26 27
T4000
CLOSE
NC.
32 29 30 31
OUT. 22
VARIABLE
RELAY
ELECTRONIC GOVERNOR
GAS ENGINE
AUTO-SYNCHRONIZER
T4000