ACCESSOR I ES
6/9
Opening and closing release test unit - YO/YC Test Unit The opening and closing releases test unit helps ensure that the various version of releases are running smoothly, to provide a high level of reliability in controlling circuit-breaker opening. The test unit helps ensure the continuity of the opening and closing releases with a rated operating voltage between 24V and 250V (AC and DC), as well as verifies the functions of the opening and closing coil electronic circuit. Continuity is checked cyclically with an interval of 30s between tests. The unit has optic signals via LEDs on the front, which provide the following information: POWER ON: correct power supply of the YO/YC Test Unit OPEN ON: coil switch absent, power supply absent or insufficient, interrupted cables SHORT ON: coil switch failure, short-circuited cables OPEN and SHORT FLASHING: faulty coil switch or incorrect supply OPEN and SHORT OFF: correct operation of the coil switch. Two relays with one change-over area also available on board the unit, to allow remote signalling of the following events: Failure of a test - resetting takes place automatically when the alarm stops Failure of three tests - resetting occurs only by pressing the manual RESET on the unit.
Characteristics of device Auxiliary power supply
24V...250V AC/DC
Specification of the signalling relays
Maximum interruped current Maximum interrupted voltage
6A
250V AC
Undervoltage release – YU (Fig. 07) The undervoltage release opens the circuit- breaker when there is a significant voltage drop or power failure. It can be used for safe remote tripping, for blocking closing or to control the voltage in the pri- mary and secondary circuits. The power supply for the release is therefore obtained on the supply side of the circuit-breaker or from an independent source. Circuit-breaker closing is permitted only when the re- lease is powered. The undervoltage release is an alternative to as second shunt trip or the anti-racking out device. The circuit-breaker is opened with trip unit power supply voltages of 35-70% Un. The cir - cuit-breaker can be closed with a trip unit power supply voltage of 85-110% Un.
General characteristics Power supply (Un)
AC
DC
24V 30V 48V 60V
— Fig. 07
110V…120V 120V…127V 220V…240V 240V…250V 380V…400V 415V…440V 480V…500V
- - - -
Inrush power (Ps)
300VA 3.5VA
300W 3.5W
Continuous power (Pc)
Opening time (YU)
E1.2
30 ms 50 ms
E2.2 … E6.2
— Electrical diagram reference: figure 73
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