Circutor CR-250 User manual

CURRENT INJECTION
RELAY TESTER
CR-250
( Code P60213 (770070) )
INSTRUCTIONS MANUAL
( M 981 330 05A )
(c)
CIRCUTOR S.A.

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CURRENT INJECTION RELAY TESTER CR-250
1.- CR-250 DESCRIPTION
CR-250 is a current source specially designed for testing the current/time
curves of automatic switches and indirect protection relays.
The CR250 consists of an adjusta le current source, a control circuit and a
measurement unit.
- The current source is supplied y the mains, at 230Vac and is provided
with an adjusta le autotransformer, a separation transformer with two
independent outputs and corresponding output terminals.
This circuit is protected y 20A automatic reaker and is provided also
with an output to supply the 2500 A transformer (Code: P69903 (770071))
- The control circuit consists of an ON/OFF element, indications and
voltage free external terminals to e connected to the contact (NC or NO)
of the relay to e tested.
- The measurement unit is synchronized with the start and stop of the
current circuit. It consists of a digital ammeter and chronometer. The
measurement unit and the control circuit are protected y a fuse.

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2.- MAIN CHARACTERISTICS
SUPPLY:
- Voltage 230Vac + 10% - 15 %, single phase - 50.....60 Hz
- 20 A maximum
ADJUSTABLE CURRENT SOURCE
- Outputs: 0 - 30V, 50A ma . 1500 VA
0 - 6V, 250A ma . 1500 VA
- Isolated circuit
- Maximum overcurrent: 1,25 In, 1 minute
- Current adjustment y turning control kno
- Output y means of the 1A/200A transformer; power 4000 VA-
2500 A max. (optional)
CURRENT MEASUREMENT
- Digital ammeter with following scales:
19,99A 199,9A 999A 999 10A
- Preselection of the scales y scale selector
- Out of scale indication
- Protection against over current
- Accuracy : ± (0.5 % of readout + 0,5% Full scale)
TEST TIME MEASUREMENT
Digital chronometer up to 9999,99 seconds
TEST CONTROL
- Start : By means of ‘ON’ utton
- Stop : Automatic y external NC contact
Automatic y external NO contact
Manual y ‘OFF’ utton
- The time of the test is shown in the chronometer display until the "Reset"
utton is pressed.
DIMENSIONS, WEIGHT
- Dimensions : 500 x 415 x 280 mm
- Approximate weight : 43 kg.
ACCESSORIES (included)
2 ca les of 6 m for test up to 250 A
2 ca les of 6 m for test up to 30 A
1 ca le for control of the chronometer
1 instruction manual
OPTIONAL ACCESSORIES 2500A
- Transformer 1A/200A (2500 A) ( code P69903 (770071) )
- Ca le - 1,5m - 2500A ( code P69902 (770072) )

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3.- INSTALLATION AND START-UP
The manual you hold in your hands contains information
and warnings that the user should respect in order to guarantee
a proper operation of all the instrument functions and keep its
safety conditions.
Whether the instrument is not used as manufacturer’s specifications,
the protection of the instrument can be damaged.
When any protection failure is suspected to exist (for example, it
presents external visi le damages), the instrument must e immediately
powered off. In this case contact a qualified service representative.
3.2.- CONNECTION UP TO 250A
Once the necessary test current is determined, the CR-250 can e
connected to the relay to e tested.
- If the necessary current is higher than 30A, the 70 mm
2
section ca les
have to e used.
- For current of 30A or lower, the 6 mm
2
section ca le have to e used.
- The terminals are chosen according to the required current (up to 50A or
up to 250A), the common is the same for oth current ranges.
- If it is assumed that the Stop at the end of the test is done automatically,
it is necessary also to connect two ca les at the ‘EXTERNAL CONTACT-
NC/NO ’ terminals and at the contacts of the relay under test. Also the
switch has to e set according to the function of the contacts of the relay
under test:
NC: normally closed (stops when opening)
NO: normally open (stops when closing)
- In case the stop has to e done manually, the ‘OFF’ utton has to e
used. In this case no ca le need to e connected to the ‘EXTERNAL
CONTACT-NC/NO’ terminals and the switch has to e set to the ‘ADJUST’
position.

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3.2.- CONNECTION UP TO 2500 A (optional)
In this case, the 1A/200A (2500 VA) transformer that can e ordered as
optional accessory for the CR-250 is used.
Due to the large currents that can e o tained, it is necessary that the
distances are as minimal as possi le and all connections perfect. For the
connection, the 1,5m ca le, that is supplied as accessory, can e used.
The 1A/200A transformer is supplied from the CR-250 y the 6mm section
ca le delivered with the CR-250 and connected to the 0-250V output at the
ack side of the CR-250.
The connection of the ‘EXTERNAL CONTACT-NC/NO’ is as descri ed in
the previous section.

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4.- TESTING THE RELAY
PREVIOUS ADJUSTMENT
- The ammeter has to e set to the 999A scale (or 10 x 999 scale in case
the 1A/200A, 2500 VA transformer is used)
- The switch is set to the ‘ADJUST’ position.
- With the turning kno in the 0% position, the ‘ON’ utton is pressed and
the required current can e adjusted.
 THE ADJUSTMENT TIME HAS TO BE AS SHORT AS POSSIBLE TO
AVOID PREVIOUS WARMING OF THE RELAY. IN ANY CASE, A
CERTAIN COOLING DOWN TIME HAS TO BE PASSED BEFORE
EXECUTING THE TEST.
TEST
- The switch is set to the required position (NC or NO).
- The correct setting of the ammeter has to e set in order to get the
maximum accuracy in the read-out.
- The RESET utton has to e pressed to set the chronometer to’0’
- Now the ‘ON’ utton can e pressed that starts the flow of the selected
current and the chronometer will start to count.
 If the CR250 is not starting to test, pro a ly the NO / NC switch is in
the wrong position.
DURING THE TEST, AS THE TEMPERATURE OF THE RELAY UNDER
TEST WILL CHANGE, ALSO THE FLOWING CURRENT WILL CHANGE.
IT IS THEREFORE NECESSARY TO READJUST THE CURRENT
FREQUENTLY TO MAINTAIN THE CURRENT AT THE REQUIRED
VALUE.
If the stop is automatical, the test is stopped when the relay contact trips. In
case the stop has to e manual, the ‘OFF’ utton has to e pressed
immediately when the relay trips.
In oth cases, the duration of the test will e indicated in the chronometer
display until the ‘RESET’ utton is pressed.

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5.- INTERPRETATION OF THE RESULTS
The goal of the test is to know tripping time of a relay for a previous set
over-current. The CR-250 relay tripping tester from CIRCUTOR allows the
read-out of this time y means of a digital chronometer. The result is given
in seconds, decimals and hundreds of seconds. It is the responsi ility of
the operator that the current stays sta le on the set value during the whole
test.
6.- SAFETY CONSIDERATIONS
All installation specification descri ed at the previous
chapters named INSTALLATION AND START-UP,
INSTALLATION MODES and SPECIFICATIONS.
Note that with the instrument powered on, the
terminals could e dangerous to touching and cover opening actions or
elements removal may allow accessing dangerous parts. This instrument is
factory-shipped at proper operation condition.
7.- MAINTENANCE
The CR-250 does not require any special maintenance. No
adjustment, maintenance or repairing action should e done over the
instrument open and powered and, should those actions are essential,
high-qualified operators must perform them.
Before any adjustment, replacement, maintenance or repairing
operation is carried out, the instrument must e disconnected from any
power supply source.
When any protection failure is suspected to exist, the instrument
must e immediately put our of service. The instrument’s design allow a
quick replacement in case of any failure.
8.- TECHNICAL SERVICE
For any inquiry a out the instrument performance or whether any
failure happens, contact to CIRCUTOR’s technical service.
CIRCUTOR S.A. - After-sales service
VIAL SANT JORDI, S/N
082 2 VILADECAVALLS (BARCELONA)
Tel - + 4 9 745 29 00 - fax - + 4 9 745 29 14
E-mail : [e-mail]
We : www.circutor.com

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ANNEX A
MAIN ELEMENTS (FRONT PART)
RESET ON
OFF
N C N O ON
19,99
199,9
999 999 10
ADJUST
CR-250
Regulator of
current
ON : Indicating
light signal
DIGITAL
AMMETER
Scale buttons
for Ammeter
ON: Start Button
OFF: Stop Button
Reset button for chronometer
CHRONOMETER
Selector
NC / ADJUST /NO

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ANNEX B
MAIN ELEMENTS: CONNECTIONS ( REAR PART)
50250COMMON
I. Ma .
0 --- 250 V
OFF
ON
OUT
Power supply 230 V a.c.
(With fuse )
Magnetothermic
relay
In = 20 A
E ternal contact
Regulated output :
suitable for connection
of the 1 A / 200 A CT
OUTPUTS :
Common- 250 : ma imum 250 A -6 V
Common - 50 : ma imum 50 A - 6 V

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ANNEX C
CURRENT TRANSFORMER :
TI-2500 A ( 1 / 200 A )
Power : 4000 VA
Primary : 0 ... 250 V a.c.
0 ... 16 A
50 Hz / 60 Hz
Secondary : 0 ... 1.6 V
0 ... 2500 A
Dimensions :
Ext. : 300x250x160 mm
Useful diameter : 60 mm
(P6990 )
PRIMARY
CABLE
TI-2500 A
(included
with the
transformer)
(P6990 )
CR-250
REAR PART
(P6021 )
CONNECTION DIAGRAM : CR-250
WITH THE TRANSFORMER TI-2500 A
RELAY
TO TEST
CABLE :
Length :
500 mm
1.5 m
2
(P69902)
Note: Due the high flowing currents that will e o tained, very chort distances
and perfect connections will e required.
50250COMMON
I. Ma .
0 --- 250 V
OFF
ON
OUT