TECHNICAL FEATURES AND REGULATIONS DIP-SWITCH SET UP It is used to programme the conditions of the device. It must be set for before any other operation. SP Length of the period of the timer, adjustable by screwdriver on the front.(divided in 10 parts). The full scale range is selected by the dip switches DS1 1-6 (See in Tab. A). TC Timer (0,5÷15 sec) adjustable by screw-driver on the front. It is activated by closing the contact ENABLE (pin 4- 8). It keeps the T 01 out of operation for the set period TC, in order to allow a slow system to reach the regular speed. ENABLE: (pin 4-8) The contact ENABLE activates the device during the required phases of machine operation: For instance if it is a contact of the motor contactor, the duty cycle is represented by the diagram of fig. 2 as follows: The relay energizes when the device is supplied; the ENABLE contact is opened and no alarm condition takes place even in absence of pulses. The motor starts up, the ENABLE contact closes, the pulses appear, the relay remains ON. During the closing of the ENABLE contact the pulses fail or slow down, the led “A” lights and the relay changes over. The reset takes place by pressing the push button RESET or momentarily close a contact between pins 2-10 (telereset) (if the dip-switch DS2-1 is to the right.). The ENABLE contact opens and the pulses fail; the relay remains ON and no alarm condition takes place. When the device makes the motor stop, it is possible to know if the stop is due to the operator or to an alarm condition. MODE OF OPERATION Reference is made to paragraph ENABLE. Generally the pulses are given by the straight-line movement or by the rotation of disks with holes around the circumference or wheels with teeth etc as per fig. 4 and 5. The minimum duration of the pulse must be >30µs. The device is influenced only by the edge of the pulse; when the shaft is stopped it does not make any difference if the device sees metal or hole. After the contact ENABLE is closed, the first pulse must appear within the TC set period. SETTING SP is selected on the base of the frequency of the pulses. Ex.: it is requested to detect when a shaft turning at 200 RPM slows down to 10 RPM by the application of a disk giving one pulse per revolution, in correspondence of 10 RPM there are 10 pulses/min so that the period between two pulses TP, is 6 sec. It is necessary to select the range of 20 sec. and fix the knob after the third step, since SP fixed by the knob must be higher than the period of the pulses (obviously at 200 RPM TP is lower than 6 sec and SP will be even higher). In case of sudden shaft stop, the device needs the time SP to detect the pulses failure. By the application of a wheel (with teeth on the circumference) giving 30 pulses per each revolution, 30x10 = 300 pulses/min; TP = 60/300 = 0,2sec. The selected range is 500 msec; the knob is set on step 5 (0,25 sec). In case of sudden shaft stop, it is necessary 0,25 sec for the system to detect the pulses failure. POSITIVE SAFETY (dip-switch 2 n. 4 to the left). In presence of the pulses the relay is ON; when the relay is broken or the supply fails, the relay goes OFF. INSTALLATION ELECTRIC WIRING As per fig. 6. (Wiring to an electrical board with a differential relay and a sectionalizing switch). The length of every wiring must be less than 30m. OUTPUT 5A 230Vac resistive load 5-7 NO 5-6 NC SUPPLY: 2VA - 50÷60Hz Tolerance: ±10% 1-11: 230 Vac or 115 Vac or 24 Vac or Vdc on request. WORKING TEMPERATURE: 0÷70°C SIZE: 48x96x90 mm - undecal male base. Accessories available on request: E 171 : hooks for flush mounting. E 172 : undecal female base for DIN. M 13A: plexiglas protection IP 54-tight closure (for flush mounting). E 346 : hold wire protecting from vibrations. Template:45x92 mm WEIGHT: kg 0,300 COLOUR: black RANGES Selected by the DS1-1÷6

Remark: it replaces T 01 changing the wirings. FUNCTION The device receives from an amplified sensor (NPN or PNP) or a NAMUR sensor (or mechanical contact) a train of pulses the frequency of which is proportional to the speed of the shaft to be controlled; at each pulse an internal timer starts for the period TT. The device is in alarm if after the period SP there is no pulse. If before the end of SP a new pulse comes, the timer resets and it starts again (fig.1). USE It detects the deceleration or the stop of a shaft.

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