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Contactor TKS101DOD

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contactor TKS101DOD
TKS101DOD
contactor TKS101DOD



SINGLE-CIRCUIT SWITCHING CONTACTOR

ТКС101ДОД (TKS101DOD)

 

OPERATING INSTRUCTIONS

 

Single-circuit switching contactor ТКС101ДОД is intended for circuit switching in electrical systems.

The contactor is manufactured in all-climatic version and is used for operation under the following conditions:

ambient temperature from minus 60 to plus 85 °C and during short time (not more than 5 min after every 2 h) up to 130 °C;

relative air humidity up  to 100 % at a temperature of up to 40 °C;

atmospheric pressure 780 ... 41 mm Hg;

thermal cycling;

exposure to hoar frost and dew;

mould effects;

vibratory loads—0.2 ... 5 g (proportionally with frequency) at a frequency of 5 ... 50 Hz; 5 g at a frequency of 50 ... 300 Hz;

impact loads with acceleration up to 15 g within range of 40 ... ... 80 impacts per min (at pulse duration of 20 ... 50 ms);

spontaneous switching on/off of contacts at linear accelerations up to 10 g are not allowable;

voltage variation of switched d. c. circuit — 16 .. .30 V;

voltage variation of switched a.c. circuit with frequency of 360 to 1100 Hz—20... 220 V;

current variation of switched circuit — 2.5 ... 100 A;

voltage variation in control circuit with its total resistance of up to 1.5 Й—24.. .30 V.

In the process of operation the contactor can withstand:

twofold current with respect to the rated (without contact break­ing) within two minutes;

5 switching-ons and 3 switching-offs of eightfold current with respect to the rated at direct current (т=0.002— 0.004 s) or fivefold current with respect to the rated in ohmic circuit at alternating cur­rent. Duration of current flow till break is not greater than 1 s.

The contactor is designed for operation under conditions of ma­ximum total time (500 h) during which the winding can be energi­zed.

SPECIFICATIONS

Rated voltage of switched d.c. circuit, V ....………………………………………………….   27

Rated current of switched circuit (at т=0.001 s; cos ф=0.5), А  …………………………….. 100

Rated voltage in contactor control circuit, V ....………………………………………………  27

Current consumed by electromagnet under normal conditions at

rated voltage, A, not greater than   ......……………………………………………………….  0.34

Current in auxiliary lead-out circuit (at т=0.015 s; cos (p=0.5),A  …………………………… 0.2 ... 5

Actuation (reference) time under normal climatic conditions, at rated voltage, ms,

not greater than  ......……………………………………………………………………………15

Wear resistance at switching on/off:

at т=0.001 s; cos ф=0.5 ........……………………………………………………………… 10 000

at rated current in ohmic circuit under surface conditions  ……………………………….. 15 000

Permissible frequency of operations per min ....……………………………………………….. 4

Mode of operation   ..........……………………………………………………………………  continuous

Mass, kg    .............…………………………………………………………………………….. 0.37

Note: In case of d.c. switching fourfold current with respect to the rated is allowed to be switched on if this current decreases to the rated value within 1 s

DESIGN AND OPERATION

The contactor (Fig. 1) consists of an electromagnet, a contact sys­tem, a return spring and an interlock contacts.

The electromagnet has a closed magnetic system and consists of a cylindrical body, a pole, a core, a flange and a coil.

The core moves in a brass bush and, with the aid of a rod, im­parts motion to the contact system.

The coil having two (switching-on and holding) windings is enclosed in a casing and, by the bush internal diameter is locked on the pole.

The free space between the coil and the casing is filled with com­pound. The coil leads A and Б (Fig. 2) are connected to terminal screws 25 (Fig. 1).

The electromagnet is linked to the contact system with the help of a plate screwed to the flange and panel 9. The contact system consists of a movable and a fixed portion. The contact system fixed portion comprises

panel 9 with two power screws 15 press-fitted into it, two terminal screws 25, auxiliary lead-out screw В (Fig. 2) and two fixed contact arms 16 (Fig. 1).

The contact system movable portion includes movable contact arm 11 and buffer spring 12, both arranged on the rod. Soldered to movable (11) and fixed (16) arms are power contacts. The mo­vable contact arm is connected to auxiliary lead-out screw В by means of a flexible conductor.

Buffer spring compression is adjusted by washers 13, and the contact gap, by washers 10.

Return spring 5 is arranged in the recess of the pole and core. Return spring compression is adjusted by washers 8.

Power unit assembly consists of panel 23, arm (busbar) 1 and spring 24.

The busbar and spring with contacts are fitted on the panel at­tached to the electromagnet body by means of screws.

The contact gap in the interlock contacts is adjusted by glass-cloth-base laminate shims.

The interlock contacts are closed by a cap.

Displacement of the contact system movable portion is effected with the aid of the electromagnet having two windings: a switching-on (BO) (low-resistance, Fig. 2) and a holding (УО) (high-resis­tance) winding.

When a voltage  is applied to the contactor electromagnet win­ding, a current passes through switching-on winding BO. Due  to low-resistance of this winding, a great electromagnetic force is crea­ted which is necessary to start the core. The latter is attracted to the pole thus setting in motion the contact system movable portion, the normally open power contacts become closed.

As the core moves, the rod rigidly coupled to it, with its plas­tic end, presses the interlock contact spring and, opening the con­tact, puts holding winding УО into action. The winding total resistan­ce increases which makes it possible to keep the contactor winding energized for a long time.

Since the contact gap is smaller than the magnetic one, the co­re continues to move after contact closure and compresses the buf­fer spring thus providing the required contact pressure.

When the voltage is removed from the electromagnet windings or decreased below the switching-off voltage, the electromagnet force becomes less than the total force of the return and buffer springs, and the core with the contact system movable portion re­turns to its initial position. This causes the contact system to re­turn to the initial position under the action of the return spring.

INSTALLATION PROCEDURE

The place of contactor installation at the using activity should} meet the following requirements:

the contactor must be protected against ingress of water, kero­sene, oil, acid, dust, dirt and metal filings;

if the contactor is arranged close to heated elements, the hea­ting temperature of contactor windings must not exceed 180 °C.

Before installing the contactor on its place of employment, pro­ceed as follows:

inspect it to make sure there are no signs of mechanical dama­ge that may be caused during shipment and unpacking;

check the contactor insulation resistance (in a cold state) which must be not lower than 50 МOм;

test the contactor in a cold state for switching on/off with the voltage at the control circuit terminal screws equal to 27 ±3 V;

in doing so, check the contactor circuits with the aid of a test lamp.

The contactor is to be installed on an even surface and secured to the plate with screws.

The wires to be connected to the contactor power screws should have cable lugs; the wires to be connected to the control circuit ter­minal screws and to the auxiliary lead-out screw should have cable lugs with holes corresponding to the terminal screw diameter. The busbars having a hole, a cross-section and contact surface area corres­ponding to an ordinary lug can be used instead of the wires.

Cable lugs or current-supplying busbars must directly adjoin the contact surfaces. No washers should be placed under the lugs. A reliable electrical contact is ensured by tightening the   spring washers on the power and terminal screws with the aid of nuts. When tightening the nuts, see that the tightening torque does not exceed at terminal screws M4  (terminals A and Б, Fig. 2)— G.12 kgf-m, and at power screws M6 (terminals 1 and 2)—0.25 kgf-m.

Overall and mounting dimensions of the contactors are given in Fig. 3.

DIRECTIONS FOR USE

In the process of utilization, during periodic servicing of the unit on which the contactor is mounted, it is necessary to clean the contactor of dirt, and also to check it for proper wiring and moun­ting.

The contactor contacts are allowed to be subjected to a short-term twofold current load not earlier than after 5 h of operation.

The contactor is adjusted at the Manufacturing plant. It is im­permissible to perform its dismantling and adjustment while the contactor is in use.

In case of failure the contactor is not to be repaired, but replaced with a new one.

Useful life (time of operation) is

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