RELAY OUTPUT [SCR t1-t2] The two internal relays RA and RB are, by default, “normally ON” (the NC contacts are closed) and they will go “OFF” in case of alarm. The two relays can be individually programmed “normally OFF” and they will go “ON” in case of alarm. ANALOG OUTPUT [SCR s] At the pins 17-18 (+ on pin 17) the voltage 0-10Vdc full scale (max 1mA) is available. The 0-10 Vdc signal is proportional to the instant active power Wa measured or to the shaft power Wr calculated by W16 depending of the value of the related parameter in the set screen. It is suggested to apply a DC VOLTMETER DVD 08, with calibration of the reading, in order to display "100" or the value appearing on the display of W 16-2 during normal operation (“A” screen) INPUTS Input Resistance=800 k Voltage pins: 15-13-11. (See Remark 1). Maximum threephase voltage is 415 Vac. For higher voltages is requested the application of M 08: Threephase drop resistances (see Fig. 8). Current range: direct up to 80A, With external CT .../5 for current higher than 80A (see TAB. C). OUTPUTS RELAYS 5A (NO) 230 Vac, resistive load “a1” 8-9 NO 8-7 NC Device not “b1” 5-6 NO supplied 5-4 NC SUPPLY: 230 Vac or 24 Vac Single voltage 6VA 50-60 Hz ±10% -pin 1-2 DIMENSIONS: 100x70x110 mm Din Rail WORKING TEMPERATURE: 0÷70°C WEIGHT: Kg 0,550 COLOUR: grey

FUNCTION The device detects the absorbed current I, the three phase voltage V and the power Wa absorbed by the motor, and it works out the power delivered to the shaft Wr. In view of getting the above parameter it is necessary to know some values of the electric motor applied, such as: - Rated Power WN [SCR f] - Rated Current IN [SCR g] - Number of poles Np [SCR e] USE The electric motor is the typical load to be controlled by a shaft power monitor relay. In fact by monitoring the shaft power (input power decreased by power loss) we get an accurate information about the load applied to the motor. Such information is more complete than the current intensity. In fact the cosφ variations can generate power variations, even in absence of remarkable variations of current value

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