Catalogo Puesta A Tierra

CURRENT INJECTION RELAY TESTER

CR-250
(Code 7 70 070)

INSTRUCTIONS MANUAL
( M 981 330 / 99 B )

(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.

TheCR250 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 Atransformer (Code: 770 071) - 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 afuse.

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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 the1A/200A transformer; power 4000 VA2500 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 ± 1 digit 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 : - Approximate weight :

500 x 415 x 280 mm 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 ofthe chronometer 1 instruction manual OPTIONAL ACCESSORIES 2500A - Transformer 1A/200A (2500 A) - Cable - 1,5m - 2500A

( code 7 70 071 ) ( code 7 70 072 )

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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 allthe 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 mm2 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 bothcurrent 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...