Page 111 - Sace Emax 2 Catalogue

ACCESSORIES 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 guarantee a high level of reliability in controlling circuit-breaker opening.
The test unit ensures 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 6A
Maximum interrupted voltage 250V AC

06

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
Fig. 07 60V
110V…120V
120V…127V
220V…240V
240V…250V -
380V…400V -
415V…440V -
480V…500V -
Inrush power (Ps) 300VA 300W
Continuous power (Pc) 3.5VA 3.5W
Opening time (YU)
E1.2 30 ms
E2.2 … E6.2 50 ms
—
Electrical diagram reference: figure 73