FUNCTIONING
Lower voltage value (U1) and upper voltage value (U2) are set by means of potentiometers. It is so-called eye of voltage, in limits of which can occur changes of phases voltages that do not cause activation of relay. Supplied a relay is signalized by shine of green LED .Correct value of voltage is signalized by shine of yellow LED.( position of joint 7-10). Change of phase voltage on one of phases above or below set voltage tresholds will cause activation of relay (switch joints to position 7-12). Decrease of voltage below establish value U1 is signalized by shine of LED red (U1). Increase of voltage below establish value U2 is signalized by shine of LED red (U2). Reactivation follows automatically return of correct voltage value. The relay can be supplied with a voltage up to 450V~. This ensures the effective protection of the receiver even in case of a voltage increase beyond allowable standards. Also, in case of supply polarity exchange or when "zero" is switched off (for three-phase types) the relay will not be destroyed ("burned").
ATTENTION!
Because of unstable voltage in mains and frequent changes of supply voltage beyond the set thresholds of “eye of voltage” (at leat 10 times per 1minute), relay blocks itself for 10 minutes (joint stay at position 7-12). This prevents against too frequent, cyclic switching-ON and OFF of the connected receiver. Condition of blockade is signalized by shine of yellow LED. A