LV1 09 Gesamt EN.book Seite 97 Mittwoch, 11. Februar 2009 3:54 15 Siemens AG 2009 Accessories and Spare Parts For 3RT, 3RH Contactors and Contactor Relays Accessories for 3RT, 3RH contactors and contactor relays Overview Snap-on auxiliary switch blocks With the OFF-delay variant of the timing relay, the contactor coil is contacted directly through the relay terminals A1 and A2 of The auxiliary switch blocks and the maximum number of blocks the contactor coil must not be connected. that can be mounted are described in the sectionsMotor Con- tactor andContactor Relay. The timing relays are suitable for both AC and DC operation. Size S00 Solid-state time-delay auxiliary switch block The version for size S00 contactors is fitted onto the front of the The timer module, which is available in theON-DELA and contactor (with the supply voltage switched off) and then slid OFF-DELA versions, allows time-delayed functions up to into its latched position at the same time, the timing relay is con- 100 s (3 distinct delay ranges). nected by means of plug-in contacts to coil terminals A1 and A2 It contains a relay with one NO contact and one NC contact de- of the contactor. Any contactor coil terminals which are not re- pending on the version, the relay is switched either after an ON- quired are sealed off by means of covers on the enclosure of the delay or after an OFF-delay. time-delay block, to prevent them from being connected inadvertently. The timer module withWYE-DELTA FUNCTIO is equipped with one delayed and one instantaneous NO contact, with a A varistor is integrated in the timer module in order to damp dead time of 50 ms between the two. The delay time of the NO opening surges in the contactor coil. contact can be adjusted between 1.5 s and 30 s. The solid-state, time-delay block cannot be mounted on size S00 Wye-delta function: coupling relays. Sizes S0 to S3 . + , The time-delay block for size S0 to S3 contactors is plugged into + - coil terminals A1 and A2 on top of each contactor the timing re- + lay is connected both electrically and mechanically by means of , pins. A varistor is integrated in the timer module in order to damp The contactor on which the solid-state, time-delay auxiliary opening surges in the contactor coil. switch block is mounted operates without a delay. Configuring note: Size S00 The solid-state, time-delay auxiliary switch block is fitted onto the a) b) NSB0 00455b L1 L1 NSB0 00454b front side of the contactor. The timer module is supplied with K3 S1 power directly by plug-in contacts through the coil terminals of S1 the contactor, in parallel with A1/A2. The timing function is acti- K3 K3 A1 B1A2 A1 B1A2 vated by closing the contactor on which the auxiliary switch 1 1 block is mounted. The OFF-delay version operates without an A1 A2 A1 A2 auxiliary voltage minimum ON period: 200 ms. 2 2 N N A varistor is integrated in the timer module in order to damp opening surges in the contactor coil. Timing relay block % Contactor The solid-state, time-delay auxiliary switch block cannot be mounted on size S00 coupling relays. The activation of loads parallel to the start input is not permissi- ble when using AC control voltage (see (a) in the circuit Sizes S0 to S12 diagram). The solid-state, time-delay auxiliary switch block is fitted onto the The 3RT19 16-2D. . . / 3RT19 26-2D. . . OFF-delay timing relay front side of the contactor. blocks have a zero potential start input B1. This means that if The timer module is supplied with power through two terminals there is a parallel load on terminal B1, activation can be simu- (A1/A2) the time delay of the auxiliary switch block can be acti- lated with AC voltage. In this case, the additional load vated either by a parallel link to any contactor coil or by any (e. g. contactor K3) must be wired according to (b). power source. OFF-delay device for size S00 to S3 contactors The OFF-delay version operates without an auxiliary voltage minimum ON period: 200 ms. AC and DC operation A single-pole auxiliary switch block can be snapped onto the IEC 60947, EN 60947. front of the contactor in addition to the timer module. For screw and snap-on mounting onto 35 mm standard mount- The timer module has no integrated components for overvoltage ing rail. The OFF-delay devices have screw terminals. damping. The OFF-delay device prevents a contactor from dropping out unintentionally when there is a short-time voltage dip or voltage Solid-state time-delay block with semiconductor output failure. It supplies a downstream, DC-operated contactor with The timer module in theON-DELA andOFF-DELAY with aux- the necessary energy during a voltage dip, ensuring that the iliary voltag versions allows time-delayed functions up to 100 s contactor does not trip. The 3RT19 16 OFF-delay devices are (3 distinct delay ranges). Contactors fitted with a time-delay specifically designed for operation with the 3RT contactors and block close or open after a delay according to the set time. 3RH contactor relays of the SIRIUS series. The ON-delay variant of the timing relay is connected in series The OFF-delay device operates without external voltage on a ca- with the contactor coil terminal A1 of this coil must not be pacitive basis, and can be energized with either AC or DC (24 V connected. version only for DC operation). Voltage matching, which is only necessary with AC operation, is performed using a rectifier bridge. Siemens LV 1 2009 3/97 3LV1 09 Gesamt EN.book Seite 98 Mittwoch, 11. Februar 2009 3:54 15 Siemens AG 2009 Accessories and Spare Parts For 3RT, 3RH Contactors and Contactor Relays Accessories for 3RT, 3RH contactors and contactor relays A contactor opens after a delay when the capacitors of the sole- A so-called counter-e.m.f. (electromotive force) is produced noid coil, built into the OFF-delay device, are switched in paral- when motors or various inductive loads are turned off. Voltage lel. In the event of voltage failures, the capacitors are discharged peaks of up to 4000 V may occur as a result, with a frequency via the solenoid coil and thereby delay the opening of the spectrum from 1 kHz to 10 MHz and a rate of voltage variation contactor. from 0.1 to 20 V/ns. If the command devices are upstream of the OFF-delay device in the circuit, the OFF-delay takes effect with every opening op- eration. If the opening operation is downstream of the OFF-delay device, an OFF-delay only applies in the event of failure of the mains voltage. Operation In the case of the versions for rated control supply voltages of 110 V and 230 V, either AC voltage or DC voltage can be applied on the line side, whereas the variant for 24 V is designed for DC operation only. A DC-operated contactor is connected to the output in accor- dance with the input voltage that is applied. The mean value of the OFF-delay is approximately 1.5 times the specified minimum time. Capacitive input to various analog and digital signals makes it necessary to suppress interference in the load circuit. Surge suppressors Reducing contact arcing Without LED (also for Cage Clamp terminals) size S00, S0, S2, S3, S6 to S12 The connection between the main current path and the EMC suppression module enables contact arcing, which is responsi- With LED (also for Cage Clamp terminals) ble for contact erosion and the majority of clicking noises, to be size S00 reduced this in turn is conducive to an electromagnetically com- All 3RT1 contactors and 3RH1 contactor relays can be retrofitted patible design. with RC elements or varistors for damping opening surges in the Higher operational reliability coil. Diodes or diode assemblies (comprising noise suppression diodes and Zener diodes for rapid switch-off) can be used. Since the EMC suppression module achieves a significant re- duction in radio-frequency components and the voltage level in The surge suppressors are plugged onto the front of size S00 three phases, the contact endurance is also improved consider- contactors. Space is provided for them next to a snap-on auxil- ably. This makes an important contribution towards enhancing iary switch block. the reliability and availability of the system as a whole. With all size S0 to S3 contactors, varistors, RC elements and di- ode assemblies can be plugged on directly at the coil terminals, either on the top or underneath. The plug-in direction of the diodes and diode assemblies is de- termined by a coding device. Coupling relays are supplied either without surge suppression or with a varistor or diode connected as standard, according to the version. Note: The OFF-delay times of the NO contacts and the ON-delay times of the NC contacts increase if the contactor coils are damped against voltage peaks (noise suppression diode 6 to 10 times diode assemblies 2 to 6 times, varistor +2 to 5 ms). Electromagnetic interference suppression module, 3-phase for size S00 contactors Siemens LV 1 2009 3/98 3