should be tightened to 0.9Nm or 0.7 ft/lbf only. Where
fitted, terminal covers are held in place by miniature self
tapping screws into plastic. These screws should be
tightened by hand only, sufficiently to secure the terminal
cover and prevent it vibrating.
Connection Diagram
Model 244-30*
Dimensions
Model 077-30*
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
INSTALLATION INSTRUCTIONS
Page 1 of 2
Ref: IW239 – Rev 7 – Sept 02
Products Covered
239-30*
* = any letter or number
Analogue Meter Relays
Panel Mounted 239 Series
Installation
The 239 meter relay may be mounted in a panel of any thickness
up to a maximum of 10mm. For thicker panels an accessory
clamp band is available. Consideration should be given to the
space required behind the unit to allow for connecting cables.
Units should be mounted in a reasonably stable ambient
temperature and in any event where the temperature is within the
range 0 to 60°C. The unit should not be mounted where it is
subjected to excessive sunlight and also vibration should be kept
to a minimum. Connection wires should be sized to comply with
local regulations and preferably should be terminated in tags for
the terminals provided. Labels are fixed to the unit and carry
connection information and data including input voltage, input
current and supply and application as appropriate.
These products do not have internal fuses therefore external
fuses
must
be used for safety protection under fault conditions.
Input signal conditioning
AC current transformers, dc shunts, resistors and diodes are
used as appropriate to provide an input signal of 20mV for full-
scale deflection. This is then amplified to supply a 1mA signal to
the analogue meter.
Delays
The comparator outputs are each passed to a time delay circuit
with a delay time that can be varied over the range of 0.3 to 20
seconds. The purpose of these is to allow the user to arrange for
a delay in relay operation should the monitored signal spuriously
drop or rise around the set point. This avoids a false alarm being
triggered.
Electromagnetic Compatibility
This unit has been designed to provide protection against EM
(electro-magnetic) interference in line with requirements of EU
and other regulations. Precautions necessary to provide proper
operation of this and adjacent equipment will be installation
dependent and so the following can only be general guidance:-
•
Avoid routing wiring to this unit alongside cables and
products that are, or could be, a source of interference.
•
The auxiliary supply to the unit should not be subject to
excessive interference. In some cases, a supply line filter
may be required.
•
To protect the product against incorrect operation or
permanent damage, surge transients must be controlled. It
is good EMC practice to suppress differential surges to 2kV
or less at the source. The unit has been designed to
automatically recover from typical transients, however in
extreme circumstances it may be necessary to temporarily
disconnect the auxiliary supply for a period of greater than 5
seconds to restore correct operation.
•
Screened communication and small signal leads are
recommended and may be required. These and other
connecting leads may require the fitting of RF suppression
components, such as ferrite absorbers, line filters etc., if RF
fields cause problems.
•
It is good practice to install sensitive electronic instruments
that are performing critical functions in EMC enclosures that
protect against electrical interference causing a disturbance
in function.
Connection Diagram
Outputs
The delay circuits drive double pole double throw output relays.
LED’s mounted on the front fascia show the operational state of
the relays.
Terminal
1
Signal N or -VE input
2
Signal L or +VE input
3,4 RTD or thermocouple input
4
Tap for dual auxiliary supply models
5
Auxiliary Supply Neutral (-ve if D.C.)
6
Auxiliary Supply Live (+ve if D.C.)
One Setpoint
Upscale
Downscale
Setpoint
Setpoint
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
Two Setpoints
Upscale
Downscale
Setpoint Setpoint
NC
NC
C
C
NO
NO
NC
NC
C
C
NO
NO
NC
NC
C
C
NO
NO
NC
NC
C
C
NO
NO
(16
(15
High (18
Relay (36
(35
(38
(26
(25
Low (28
Relay (46
(45
(48
Power supply
Normally provided by a multi-tapped transformer, which also
provides isolation of the input from ground or the supply. For dc
power operation, either:-
a) An inverter board is wired internally to provide the supplies
required, or
b) A 12V-0V-12V ac or dc source may be used. This option
uses no inverter and avoids any problems associated with
the switching noise generated by it. It should be noted that
this option does not isolate the input from the external
signal.
Page 2 of 2
Ref: IW239 – Rev 6 – Sept 02
INSTALLATION INSTRUCTIONS
Analogue Meter Relays
Panel Mounted 239 Series
Maintenance
Unless a fault develops, the unit requires little attention. During
routine servicing and inspection of the associated equipment, the
device 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.
Fusing and connections
1.
This unit must be fitted with external fuses in voltage and
auxiliary supply lines.
2.
Voltage input lines must be fused with a quick blow fuse 1A
maximum.
3.
Auxiliary supply lines must be fused with a slow blow fuse
rated 1A maximum.
4.
Choose fuses of a type and with a breaking capacity
appropriate to the supply and in accordance with local
regulations.
5.
Where fitted, CT secondaries must be grounded in
accordance with local regulations.
Warning
•
During normal operation, voltages hazardous to life may be
present at some of the terminals of this unit. Installation and
servicing should be performed only by qualified, properly
trained personnel' abiding by local regulations. Ensure all
supplies are de-energised before attempting connection or
other procedures.
•
It is recommended adjustments be made with the supplies
de-energised, but if this is not possible, then extreme
caution should be exercised.
•
Terminals should not be user accessible after installation
and external installation provisions must be sufficient to
prevent hazards under fault conditions.
•
This unit is not intended to function as part of a system
providing the sole means of fault protection - good
engineering practice dictates that any critical function be
protected by at least two independent and diverse means.
•
Never open circuit the secondary winding of an energised
current transformer.
Screw torque
Main terminal screws should be tightened to 1.35Nm or 1.0 ft/lbf
only. Detachable terminal connector screws should be tightened
to 0.9Nm or 0.7 ft/lbf only. Where fitted, terminal covers are held
in place by miniature self tapping screws into plastic. These
screws should be tightened by hand only, sufficiently to secure
the terminal cover and prevent it vibrating.
A = 101.6mm
B = 50.8mm
C = 39.1mm
D = 90.4mm
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.
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