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INSTALLATION INSTRUCTIONS
Ref: IWYSNC – Rev 6 – Sept 02
Analogue Instruments
DIN Instruments 240 Series & ANSI
Switchboard Meters 070 Series
LED Synchroscope & Synchrocheck
Relay with Dead Bus
Setting Up and Maintenance
The Operation as Synchro Check Relay with Dead Bus
Units are adjusted before despatch and therefore no
adjustments are required. Unless a fault develops, the unit
requires little attention. During routine servicing and
inspection of the associated equipment, the unit should be
inspected to normal standards for this class of equipment.
For example remove accumulations of dust and check all
connections for tightness and corrosion. In the event of a
repair being necessary, it is recommended that the unit be
returned to the factory or to the nearest Crompton
Instruments Service Centre, (details on page 2). Should
repair be attempted then replacement components must be
of the same type, rating and tolerance as those used in the
original circuit. It is important that should calibration be
deemed necessary, say after repair, then this should only be
attempted if the required high accuracy equipment is
available. With any enquiry please quote the full model
number found on the side of the label. The unit must be
recalibrated after repair.
Relay Ratings
Single pole changeover 250V, 5A a.c. resistive.
Model 077-14A 360° LED Synchroscope & 360 LED
Synchroscope and Synchro Check Relay Models 077-
14L/D/G/H
The operation as a Synchroscope
The 244-14A and 077-14A synchrocopes provide illuminated
indication of the actual phase difference between the
generator GEN voltages and the busbar voltage. If the LED
display rotates clockwise the generator frequency is too high
and must be reduced and visa versa if the LED display turns
anticlockwise.
The 244-14D/H and 077-14D operate in the same way as
the 244-14L and 077-14L Synchro check relays with the
addition of a dead bus option. This optional feature enables
the relay to energise with a GEN supply only thus allowing
the generator to power the BUS during a supply failure.
The operation as synchrocheck relay
The 244-14L/G and 077-14L synchroscopes are based on a
microcontroller, which interprets the input signals and
displays the phase and voltage information on a series of
light emitting diodes (LED’s).
Connection Diagrams
Model 244-14A 360° LED Synchroscope & Models 244-
‘GEN’
‘BUS’
L1 L2 L3
14L/D/G/H 360 LED Synchroscope and Synchro Check
Twenty four red LED’s are arranged in a ring simulating the
traditional 360° analogue movement. Only one LED is lit at
any one time indicating the phase difference between the
busbar (BUS) and generator (GEN) signals. The unit will
operate correctly at any frequency within its range.
The voltage levels of the two input signals are continuously
measured and compared with the user adjustable voltage
difference setting. If the measured difference is outside the
allowable range, the ring of LED’s will be extinguished and
the red GEN LED will be lit. If the voltage difference is within
range the green GEN LED will be lit and the ring of LED’s
will indicate the phase relationship.
Once the BUS and GEN signals become coincident, the unit
will wait for an adjustable time delay before lighting the
green triangular SYNCHRONISED LEDS and operating the
relay. The ring of LED is also extinguished which means the
user will only see green LED’s when the generator GEN is
synchronised with the BUS.
L2
L3
L1relay
NC
12
3
2
6
Relay
1
C
10
NO
5
IN
NC = Normally closed
CO = Common
NO = Normally open
L O A D
L O A D
Terminals 3, 10 and 12 are not
used on Model 077-14A.
NC = Normally closed
CO = Common
NO = Normally open
The rear pot adjustments should be set to suit operational
requirements.
Terminals 1,3 & 4 are not used
on Model 244-14A.
The Information contained in these installation instructions is for use only by installers trained to make electrical power installations and is intended to describe the
correct method of installation for this product. However, Tyco Electronics has no control over the field conditions, which influence product installation.
It is the user's responsibility to determine the suitability of the installation method in the user's field conditions. Tyco Electronics' only obligations are those in Tyco
Electronics' standard Conditions of Sale for this product and in no case will Tyco Electronics be liable for any other incidental, indirect or consequential damages
arising from the use or misuse of the products. Crompton is a trademark.
Tyco Electronics UK Limited
Crompton Instruments
Freebournes Road, Witham, Essex, CM8 3AH, UK
Phone: +44 1376 509 509 Fax: +44 1376 509 511
http://energy.tycoelectronics.com
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