Circutor CR-250 Instruction 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 adjustable current source, a control circuit and a
measurement unit.

- The current source is supplied by the mains, at 230Vac and is provided
with an adjustable autotransformer, a separation transformer with two
independent outputs and corresponding output terminals.

This circuit is protected by 20A automatic breaker 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 be connected to the contact (NC or NO)
of the relay to be 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 by 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 max. 1500 VA
0 - 6V, 250A max. 1500 VA

- Isolated circuit

- Maximum overcurrent: 1,25 In, 1 minute

- Current adjustment by turning control knob

- Output by 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 999x10A

- Preselection of the scales by 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’ button

- Stop : Automatic by external NC contact
Automatic by external NO contact
Manual by ‘OFF’ button

- The time of the test is shown in the chronometer display until the "Reset"
button is pressed.

DIMENSIONS, WEIGHT

- Dimensions : 500 x 415 x 280 mm

- Approximate weight : 43 kg.

ACCESSORIES (included)

2 cables of 6 m for test up to 250 A
2 cables of 6 m for test up to 30 A
1 cable for control of the chronometer
1 instruction manual

OPTIONAL ACCESSORIES 2500A

- Transformer 1A/200A (2500 A) ( code P69903 (770071) )

- Cable - 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 visible damages), the instrument must be 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 be
connected to the relay to be tested.

- If the necessary current is higher than 30A, the 70 mm2 section cables
have to be used.

- For current of 30A or lower, the 6 mm

2

section cable have to be used.

- The terminals are chosen according to the required current (up to 50A or
up to 250A), the common is the same for both 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 cables at the ‘EXTERNAL CONTACT­NC/NO ’ terminals and at the contacts of the relay under test. Also the
switch has to be 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 be done manually, the ‘OFF’ button has to be
used. In this case no cable need to be connected to the ‘EXTERNAL
CONTACT-NC/NO’ terminals and the switch has to be 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 be ordered as
optional accessory for the CR-250 is used.

Due to the large currents that can be obtained, it is necessary that the
distances are as minimal as possible and all connections perfect. For the
connection, the 1,5m cable, that is supplied as accessory, can be used.
The 1A/200A transformer is supplied from the CR-250 by the 6mm section
cable delivered with the CR-250 and connected to the 0-250V output at the
back side of the CR-250.

The connection of the ‘EXTERNAL CONTACT-NC/NO’ is as described in
the previous section.

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4.- TESTING THE RELAY

PREVIOUS ADJUSTMENT

- The ammeter has to be 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 knob in the 0% position, the ‘ON’ button is pressed and
the required current can be 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 be set in order to get the
maximum accuracy in the read-out.

- The RESET button has to be pressed to set the chronometer to’0’

- Now the ‘ON’ button can be pressed that starts the flow of the selected
current and the chronometer will start to count.



If the CR250 is not starting to test, probably 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 be manual, the ‘OFF’ button has to be pressed
immediately when the relay trips.
In both cases, the duration of the test will be indicated in the chronometer
display until the ‘RESET’ button 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 by means of a digital chronometer. The result is given
in seconds, decimals and hundreds of seconds. It is the responsibility of
the operator that the current stays stable on the set value during the whole
test.

6.- SAFETY CONSIDERATIONS

All installation specification described at the previous
chapters named INSTALLATION AND START-UP,
INSTALLATION MODES and SPECIFICATIONS.

Note that with the instrument powered on, the

terminals could be 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 be 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 be disconnected from any
power supply source.

When any protection failure is suspected to exist, the instrument
must be immediately put our of service. The instrument’s design allow a
quick replacement in case of any failure.

8.- TECHNICAL SERVICE

For any inquiry about 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
08232 VILADECAVALLS (BARCELONA)
Tel - + 34 93 745 29 00 - fax - + 34 93 745 29 14
E-mail :

[e-mail]

Web: 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 x 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. Max.

0 --- 250 V

OFF

ON

OUT

Power supply 230 V a.c.
(With fuse )

Magnetothermic

relay
In = 20 A

External contact

Regulated output :

suitable for connection

of the 1 A / 200 A CT

OUTPUTS :

Common- 250 : maximum 250 A -6 V

Common - 50 : maximum 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

(P69903)

PRIMARY
CABLE
TI-2500 A
(included
with the
transformer)

(P69903)

CR-250
REAR PART

(P60213)

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 be obtained, very chort distances

and perfect connections will be required.

50250COMMON

I. Max.

0 --- 250 V

OFF

ON

OUT